Form 8-K

8-K — Third Coast Bancshares, Inc.

Accession: 0001193125-26-420491

Filed: 2026-10-13

Period: 2026-10-06

CIK: 0001781730

SIC: 6036 (SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED)

Item: Entry into a Material Definitive Agreement

Item: Financial Statements and Exhibits

Documents

8-K — d160832d8k.htm (Primary)

EX-2.1 (d160832dex21.htm)

EX-10.1 (d160832dex101.htm)

EX-10.2 (d160832dex102.htm)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: d160832d8k.htm · Sequence: 1

8-K

false 0001781730 0001781730 2026-10-06 2026-10-06

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 6, 2026

THIRD COAST BANCSHARES, INC.

(Exact name of Registrant as Specified in Its Charter)

Texas

001-41028

46-2135597

(State or Other Jurisdiction

of Incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

20202 Highway 59 North

Suite 190

Humble, Texas

77338

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number, Including Area Code: 281 446-7000

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☒

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange

on which registered

Common stock, par value $1.00 per share

TCBX

New York Stock Exchange

(Indicate by check mark)

NYSE Texas

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 1.01 Entry into a Material Definitive Agreement.

Agreement and Plan of Reorganization

On October 6, 2026, Third Coast Bancshares, Inc. (the “Company” or “Third Coast”), a Texas corporation and the parent company of Third Coast Bank, a Texas banking association, entered into an Agreement and Plan of Reorganization (the “Agreement”), by and among the Company, Thunder Merger Sub, Inc. (“Merger Sub”), an Oklahoma corporation and a wholly owned subsidiary of the Company, and Great Plains Bancshares, Inc. (“Great Plains”), an Oklahoma corporation and the parent company of Great Plains National Bank, a national banking association with its principal office in Elk City, Oklahoma (“Great Plains Bank”).

Subject to the terms and conditions set forth in the Agreement, Merger Sub will merge with and into Great Plains (the “Merger”), with Great Plains surviving as a wholly owned subsidiary of the Company. Immediately following, and in connection with, the Merger, the Company will cause Great Plains to be merged with and into the Company, with the Company surviving the merger (the “Second Step Merger” and together with the Merger, the “Integrated Mergers”). Immediately following the Second Step Merger, or at such later time as the Company may determine, the Company will cause Great Plains Bank to be merged with and into Third Coast Bank, with Third Coast Bank surviving the merger.

Subject to the terms and conditions set forth in the Agreement, at the effective time of the Merger (the “Effective Time”), each outstanding share of common stock, par value $1.00 per share, of Great Plains (“Great Plains Stock”), will be converted into the right to receive, without interest, a number of shares of common stock, par value $1.00 per share, of the Company (“TCBX Common Stock”), rounded to the nearest ten thousandth of a share, equal to the quotient of (A) 5,570,352, divided by (B) the number of shares of Great Plains Stock issued and outstanding immediately prior to the Effective Time, except for cancelled shares and dissenting shares (the “Exchange Ratio”). The Exchange Ratio is subject to reduction in the event that Great Plains does not deliver a minimum of $153,300,000 of the sum of Great Plains’ capital, surplus and retained earnings accounts less all intangible assets, calculated as of the Calculation Time (as defined in the Agreement) and in accordance with generally accepted accounting principles of the United States consistently applied, and adjusted to reflect certain merger costs and other specified items described in the Agreement. The Company will not issue any certificates representing a fractional share of TCBX Common Stock. In lieu of any fractional share, each holder of Great Plains Stock entitled to a fractional share, upon surrender of such shares of Great Plains Stock, will be entitled to receive from TCBX an amount in cash, without interest, as described in the Agreement.

Pursuant to the terms of the Agreement, Great Plains will cause its phantom stock agreements and salary continuation agreements to be terminated in connection with the closing of the Merger, and the Company or Third Coast Bank will pay all payments to participants under such agreements in connection with the closing of the Merger or such termination no later than ten business days following the closing date.

The Agreement contains customary representations and warranties from both the Company and Great Plains, and each party has agreed to customary covenants, including, among others, covenants relating to the conduct of its business during the interim period between the execution of the Agreement and the closing of the Merger, Great Plains’ obligation to recommend that its shareholders approve and adopt the Agreement, the Merger and the transactions contemplated thereby, the Company’s obligation to recommend that its shareholders approve the issuance of shares of TCBX Common Stock in connection with the Merger (the “TCBX Share Issuance”), and Great Plains’ non-solicitation obligations relating to alternative acquisition proposals.

Pursuant to the terms of the Agreement, at or promptly following the Effective Time, each of the Company and Third Coast Bank will increase by two the number of directors constituting its board of directors and appoint Todd Taylor and Paul M. Dickinson, or such other current members of the Great Plains board of directors as mutually agreed by the Company and Great Plains, to its board of directors.

Completion of the Merger is subject to certain customary conditions, including, among others, (i) subject to certain exceptions, the accuracy of the representations and warranties of each party, (ii) performance in all material respects by each party of its obligations under the Agreement, (iii) the delivery of required closing documents, (iv) approval

of the Agreement and the Merger by Great Plains’ shareholders and approval of the TCBX Share Issuance by the Company’s shareholders; (v) receipt of required regulatory and other third-party consents or approvals, (vi) the absence of any statute, rule, regulation, order, injunction or other action prohibiting the consummation of the Merger, (vii) the Registration Statement on Form S-4 becoming effective under the Securities Act of 1933, as amended (the “Securities Act”), (viii) authorization for listing on the New York Stock Exchange of the shares of TCBX Common Stock to be issued in the Merger, and (ix) each party’s receipt of an opinion from its counsel to the effect that the Integrated Mergers will together be treated as an integrated transaction that qualifies as a “reorganization” within the meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended.

The Agreement provides certain termination rights for both the Company and Great Plains. The Agreement provides that either the Company or Great Plains may terminate the Agreement if, subject to the terms of the Agreement, (i) mutual written consent is given by both parties, (ii) the conditions to the party’s obligations to close the Merger have not been satisfied or waived by September 30, 2027, (iii) the transactions contemplated by the Agreement are disapproved by any regulatory agency whose approval is required, (iv) there has been any material adverse change with respect to the other party, (iv) the other party has breached its respective covenants or agreements or any of the representations or warranties set forth in the Agreement, or (v) the other party enters into any formal or informal administrative action with a governmental entity or any such action is threatened. The Agreement also provides that a termination fee of $11,981,827 will be payable by Great Plains in the event of a termination of the Agreement under certain circumstances, including circumstances involving alternative acquisition proposals or changes in the recommendation of Great Plains’ board of directors.

The foregoing description of the Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Agreement, which is attached hereto as Exhibit 2.1 and is incorporated herein by reference.

The representations, warranties and covenants of each party set forth in the Agreement have been made only for purposes of, and were and are solely for the benefit of the parties to, the Agreement, may be subject to limitations agreed upon by the contracting parties, including being qualified by confidential disclosures made for the purposes of allocating contractual risk between the parties to the Agreement instead of establishing these matters as facts, and may be subject to standards of materiality applicable to the contracting parties that differ from those applicable to investors. Accordingly, the representations and warranties may not describe the actual state of affairs at the date they were made or at any other time, and investors should not rely on them as statements of fact. In addition, such representations and warranties (1) will not survive consummation of the Merger, unless otherwise specified therein, and (2) were made only as of the date of the Agreement or such other date as is specified in the Agreement. Moreover, information concerning the subject matter of the representations, warranties and covenants may change after the date of the Agreement, which subsequent information may or may not be fully reflected in the parties’ public disclosures. Accordingly, the Agreement is included with this filing only to provide investors with information regarding the terms of the Agreement, and not to provide investors with any other factual information regarding the Company or Great Plains, their respective affiliates or their respective businesses. The Agreement should not be read alone, but should instead be read in conjunction with the other information regarding the Company, Great Plains, their respective affiliates or their respective businesses, the Agreement and the Merger as well as the information in the Form 10-K, Forms 10-Q, Forms 8-K and other filings that the Company makes with the Securities and Exchange Commission (the “SEC”).

Great Plains Voting Agreement.

In connection with entering into the Agreement, the Company entered into a Voting Agreement with Great Plains, Bart O. Caraway, as proxy, and certain shareholders of Great Plains (the “Great Plains Voting Agreement”). The shareholders that are party to the Great Plains Voting Agreement beneficially own in the aggregate approximately 27.6% of the outstanding Great Plains Stock. The Great Plains Voting Agreement requires, among other things, that the shareholders party thereto vote all of their shares of Great Plains Stock in favor of approval of the Merger, the Agreement and any other transactions contemplated by the Agreement and against alternative transactions and generally prohibits them from transferring their shares of Great Plains Stock prior to the termination of the Great Plains Voting Agreement. The Great Plains Voting Agreement will terminate upon the earlier to occur of (a) the date the Agreement is terminated pursuant to Section 9.01 of the Agreement or (b) the date that is 24 months after the closing date of the Merger.

The foregoing description of the Great Plains Voting Agreement does not purport to be complete and is qualified in its entirety by reference to the form of the Great Plains Voting Agreement, which is attached hereto as Exhibit 10.1 and incorporated by reference herein.

Great Plains Support Agreement.

In connection with entering into the Agreement, the directors of Great Plains and Great Plains Bank have entered into a Director Support Agreement with the Company (the “Great Plains Director Support Agreement”) pursuant to which they agreed to support the transaction and to certain additional restrictive covenants.

The foregoing description of the Great Plains Director Support Agreement does not purport to be complete and is qualified in its entirety by reference to the form of the Great Plains Director Support Agreement, which is attached hereto as Exhibit 10.2 and incorporated by reference herein.

Item 9.01 Financial Statements and Exhibits.

(d)

Exhibits.

Exhibit

Number

Description of Exhibit

2.1

Agreement and Plan of Reorganization, dated as of October 6, 2026, by and among Third Coast Bancshares, Inc., Thunder Merger Sub, Inc., and Great Plains Bancshares, Inc.*

10.1

Form of Great Plains Voting Agreement

10.2

Form of Great Plains Director Support Agreement

104

Cover Page Interactive Data File (embedded within the Inline XBRL document)

Schedules (or similar attachments) have been omitted pursuant to Item 601(a)(5) of Regulation S-K. A copy of any omitted schedule (or similar attachment) will be furnished supplementally to the SEC upon request; provided, however, that the parties may request confidential treatment pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), for any document so furnished.

Forward-Looking Statements

This communication contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks and uncertainties and are made pursuant to the safe harbor provisions of Section 27A of the Securities Act and Section 21E of the Exchange Act. These forward-looking statements reflect Third Coast’s current views with respect to, among other things, future events and Third Coast’s financial performance and include, but are not limited to, the expected completion date, financial benefits and other effects of the proposed transaction. These statements are often, but not always, made through the use of words or phrases such as “may,” “should,” “could,” “predict,” “potential,” “believe,” “looking ahead,” “will likely result,” “expect,” “continue,” “will,” “anticipate,” “seek,” “estimate,” “intend,” “plan,” “projection,” “would” and “outlook,” or the negative version of those words or other comparable words or phrases of a future or forward-looking nature. These forward-looking statements are not historical facts, and are based on current expectations, estimates and projections about Third Coast’s industry, management’s beliefs and certain assumptions made by management, many of which, by their nature, are inherently uncertain and beyond Third Coast’s control. Accordingly, Third Coast cautions you that any such forward-looking statements are not guarantees of future performance and are subject to risks, assumptions and uncertainties that are difficult to predict. Although Third Coast believes that the expectations reflected in these forward-looking statements are reasonable as of the date made, actual results may prove to be materially different from the results expressed or implied by the forward-looking statements. There are or will be important factors that could cause Third Coast’s actual results to differ materially from those indicated in these forward-looking statements, including, but not limited to, the following: (1) the occurrence of any event, change or other circumstance that could give rise to the right of one or both of the

parties to terminate the definitive merger agreement providing for the acquisition of Great Plains by Third Coast; (2) the outcome of any legal proceedings that may be instituted against Third Coast or Great Plains; (3) the possibility that the transaction does not close when expected or at all because required regulatory, shareholder or other approvals and other conditions to closing are not received or satisfied on a timely basis or at all (and the risk that such approvals may result in the imposition of conditions that could adversely affect the combined company or the expected benefits of the transaction); (4) the risk that the benefits from the transaction may not be fully realized or may take longer to realize than expected, including as a result of changes in, or problems arising from, general economic and market conditions, interest and exchange rates, monetary policy, laws and regulations and their enforcement, and the degree of competition in the geographic and business areas in which Third Coast and Great Plains operate; (5) disruption to the parties’ businesses as a result of the announcement and pendency of the transaction; (6) the risk that the integration of each party’s operations will be materially delayed or will be more costly or difficult than expected or that the parties are otherwise unable to successfully integrate each party’s businesses into the other’s businesses; (7) the possibility that the transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events; (8) reputational risk and potential adverse reactions of Third Coast’s or Great Plains’ customers, suppliers, employees or other business partners, including those resulting from the announcement or completion of the transaction; (9) the dilution caused by Third Coast’s issuance of additional shares of its common stock in connection with the transaction; (10) a material adverse change in the financial condition of Third Coast or Great Plains; (11) general competitive, economic, political and market conditions; (12) major catastrophes such as earthquakes, floods or other natural or human disasters, including infectious disease outbreaks; (13) the diversion of management’s attention and time from ongoing business operations and opportunities on merger-related matters; and (14) other factors that may affect future results of Third Coast and Great Plains including changes in asset quality and credit risk, the inability to sustain revenue and earnings growth, changes in interest rates and capital markets, inflation, customer borrowing, repayment, investment and deposit practices, the impact, extent and timing of technological changes, capital management activities and other actions of the Board of Governors of the Federal Reserve System and legislative and regulatory actions and reforms. For a discussion of additional factors that could cause Third Coast’s actual results to differ materially from those described in the forward-looking statements, please see the risk factors discussed in Third Coast’s Annual Report on Form 10-K for the year ended December 31, 2025 filed with the SEC, and Third Coast’s other filings with the SEC.

The foregoing factors should not be construed as exhaustive and should be read together with the other cautionary statements included in this communication. If one or more events related to these or other risks or uncertainties materialize, or if Third Coast’s underlying assumptions prove to be incorrect, actual results may differ materially from what Third Coast anticipates. Accordingly, you should not place undue reliance on any such forward-looking statements. Any forward-looking statement speaks only as of the date on which it is made, and Third Coast does not undertake any obligation to publicly update or review any forward-looking statement, whether as a result of new information, future developments or otherwise. New factors emerge from time to time, and it is not possible for Third Coast to predict which will arise. In addition, Third Coast cannot assess the impact of each factor on its business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements.

No Offer or Solicitation

This communication is being made in respect of the proposed merger transaction involving Third Coast and Great Plains. This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or the solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act and otherwise in accordance with applicable law.

Important Additional Information and Where to Find It

Third Coast intends to file a registration statement on Form S-4 with the SEC, which will include a joint proxy statement of Great Plains and Third Coast that also constitutes a prospectus of Third Coast, and Third Coast will file other documents regarding the proposed transaction with the SEC. A definitive joint proxy statement/prospectus will also be sent to Great Plains’ and Third Coast’s shareholders seeking the required shareholder approvals of the proposed transaction.

INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT ON FORM S-4 WHEN THEY BECOME AVAILABLE, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION REGARDING THIRD COAST, GREAT PLAINS, THE TRANSACTION AND RELATED MATTERS.

The documents filed by Third Coast with the SEC may be obtained free of charge at the SEC’s website at www.sec.gov. In addition, the documents filed by Third Coast may be obtained free of charge at its website at https://ir.thirdcoast.bank/financials/sec-filings/. Alternatively, these documents, when available, can be obtained free of charge from Third Coast upon written request to Third Coast Bancshares, Inc., Attn: Investor Relations, 1800 West Loop South, Suite 875, Houston, TX 77027, or by calling (713) 960-1300.

Participants in this Transaction

Third Coast, Great Plains, their respective directors and executive officers and certain of their other members of management and employees may be deemed to be participants in the solicitation of proxies from Great Plains’ shareholders and Third Coast’s shareholders in connection with the proposed transaction. Information about the directors and executive officers of Third Coast may be found in Third Coast’s Annual Report on Form 10-K for the year ended December 31, 2025, as filed with the SEC on March 4, 2026 and in Third Coast’s proxy statement for its 2026 Annual Meeting of Shareholders, as filed with the SEC on April 16, 2026, copies of which can be obtained free of charge from Third Coast or from the SEC’s website as indicated above. To the extent the holdings of Third Coast’s securities by its directors and executive officers have changed since the amounts set forth in Third Coast’s proxy statement for its 2026 Annual Meeting of Shareholders, such changes have been or will be reflected on Statements of Changes in Beneficial Ownership of Securities on Form 4 filed with the SEC. Additional information regarding the interests of these participants and other persons who may be deemed participants in the transaction will be included in the joint proxy statement/prospectus and other relevant materials when filed with the SEC.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

THIRD COAST BANCSHARES, INC.

Date: October 13, 2026

By:

/s/ R. John McWhorter

R. John McWhorter

Chief Financial Officer

EX-2.1

Filename: d160832dex21.htm · Sequence: 2

EX-2.1

Exhibit 2.1

EXECUTION VERSION

AGREEMENT AND PLAN OF REORGANIZATION

BY AND AMONG

THIRD

COAST BANCSHARES, INC.,

THUNDER MERGER SUB, INC.

AND

GREAT PLAINS

BANCSHARES, INC.

Dated as of October 6, 2026

TABLE OF CONTENTS

Page

ARTICLE I THE MERGER

Section 1.01

Merger of Merger Sub with and into Great Plains

Section 1.02

Effects of the Merger

Section 1.03

Certificate of Incorporation and Bylaws

Section 1.04

Directors and Officers

Section 1.05

Effect on Capital Stock

Section 1.06

Calculation of Consideration

Section 1.07

Exchange Procedures

Section 1.08

Tax Treatment

Section 1.09

Modification of Structure

Section 1.10

Dissenting Shareholders

Section 1.11

Treatment of Deferred Compensation Plans

Section 1.12

Second Step Merger

Section 1.13

Bank Merger

ARTICLE II THE CLOSING AND THE CLOSING DATE

Section 2.01

Time and Place of the Closing and Closing Date

Section 2.02

Actions to be Taken at the Closing by Great Plains

Section 2.03

Actions to be Taken at the Closing by TCBX

ARTICLE III REPRESENTATIONS AND WARRANTIES OF GREAT PLAINS

Section 3.01

Organization and Qualification

Section 3.02

Authority; Execution and Delivery

Section 3.03

Capitalization

Section 3.04

Compliance with Laws, Permits and Instruments

Section 3.05

Financial Statements

Section 3.06

Undisclosed Liabilities

Section 3.07

Litigation

Section 3.08

Consents and Approvals

Section 3.09

Title to Assets

Section 3.10

Absence of Certain Changes or Events

Section 3.11

Leases, Contracts and Agreements

Section 3.12

Taxes

Section 3.13

Insurance

Section 3.14

No Material Adverse Change

Section 3.15

Proprietary Rights

Section 3.16

Transactions with Certain Persons and Entities

Section 3.17

Evidences of Indebtedness

Section 3.18

Condition of Assets

Section 3.19

Environmental Compliance

Section 3.20

Regulatory Compliance

Section 3.21

Absence of Certain Business Practices

Section 3.22

Books and Records

-i-

TABLE OF CONTENTS

(continued)

Page

Section 3.23

Forms of Instruments, Etc.

Section 3.24

Fiduciary Responsibilities

Section 3.25

Guaranties

Section 3.26

Voting Trust, Voting Agreements or Shareholders’ Agreements

Section 3.27

Employee Relationships

Section 3.28

Employee Benefit Plans

Section 3.29

Obligations to Employees

Section 3.30

Interest Rate Risk Management Instruments

Section 3.31

Internal Controls

Section 3.32

Community Reinvestment Act

Section 3.33

Fair Housing Act, Home Mortgage Disclosure Act, Real Estate Settlement Procedures Act and Equal Credit Opportunity Act

Section 3.34

Usury Laws and Other Consumer Compliance Laws

Section 3.35

Bank Secrecy Act, Foreign Corrupt Practices Act and U.S.A. Patriot Act

Section 3.36

Unfair, Deceptive or Abusive Acts or Practices

Section 3.37

Securities Not Publicly Traded

Section 3.38

Joint Proxy Statement/Prospectus

Section 3.39

Agreements Between Great Plains and its Subsidiaries; Claims

Section 3.40

Representations Not Misleading

Section 3.41

State Takeover Laws

Section 3.42

Opinion of Financial Advisor

Section 3.43

No Other Representations or Warranties

ARTICLE IV REPRESENTATIONS AND WARRANTIES OF TCBX

Section 4.01

Organization and Qualification

Section 4.02

Authority; Execution and Delivery

Section 4.03

Capitalization

Section 4.04

SEC Filings; Financial Statements

Section 4.05

Compliance with Laws, Permits and Instruments

Section 4.06

Undisclosed Liabilities

Section 4.07

Litigation

Section 4.08

Consents and Approvals

Section 4.09

Regulatory Compliance

Section 4.10

Joint Proxy Statement/Prospectus

Section 4.11

Absence of Certain Changes

Section 4.12

TCBX Disclosure Controls and Procedures

Section 4.13

Representations Not Misleading

Section 4.14

Opinion of Financial Advisor

Section 4.15

Taxes

Section 4.16

No Other Representations or Warranties

-ii-

TABLE OF CONTENTS

(continued)

Page

ARTICLE V COVENANTS OF GREAT PLAINS

Section 5.01

Commercially Reasonable Efforts

Section 5.02

Great Plains Shareholders’ Meeting

Section 5.03

Information Furnished by Great Plains

Section 5.04

Required Acts

Section 5.05

Prohibited Acts

Section 5.06

Access; Pre-Closing Investigation

Section 5.07

Additional Financial Statements

Section 5.08

Untrue Representation

Section 5.09

Litigation and Claims

Section 5.10

Material Adverse Changes

Section 5.11

Consents and Approvals

Section 5.12

Environmental Investigation

Section 5.13

Registration Statement and Joint Proxy Statement/Prospectus

Section 5.14

Benefit Plans

Section 5.15

Termination of Contracts

Section 5.16

Conforming Accounting Adjustments

Section 5.17

Regulatory and Other Approvals

Section 5.18

Tax Matters

Section 5.19

Disclosure Schedules

Section 5.20

Transition

Section 5.21

Execution of Releases

Section 5.22

No Solicitation

Section 5.23

Directors’ and Officers’ Indemnification and Insurance

Section 5.24

Tax Certificate

Section 5.25

Retention Agreements

Section 5.26

Assumed Debt

Section 5.27

Great Plains Loan Agreement

ARTICLE VI COVENANTS OF TCBX

Section 6.01

Commercially Reasonable Efforts

Section 6.02

TCBX Shareholders’ Meeting

Section 6.03

Regulatory Filings; Registration Statement

Section 6.04

Untrue Representations

Section 6.05

Litigation and Claims

Section 6.06

Material Adverse Changes

Section 6.07

Consents and Approvals

Section 6.08

Employee Matters

Section 6.09

Board Seats

Section 6.10

Conduct of Business in the Ordinary Course

Section 6.11

Access to Properties and Records

Section 6.12

NYSE Listing

-iii-

TABLE OF CONTENTS

(continued)

Page

Section 6.13

Disclosure Schedules

Section 6.14

No Control of Great Plains’ Business

Section 6.15

Tax Matters

Section 6.16

Tax Certificate

ARTICLE VII CONDITIONS PRECEDENT TO THE OBLIGATIONS OF GREAT PLAINS

Section 7.01

Representations and Warranties

Section 7.02

Performance of Obligations

Section 7.03

Shareholder Approvals

Section 7.04

Government and Other Approvals

Section 7.05

No Litigation

Section 7.06

Delivery of Closing Documents

Section 7.07

No Material Adverse Change

Section 7.08

Registration Statement

Section 7.09

NYSE Listing

Section 7.10

Federal Tax Opinion

ARTICLE VIII CONDITIONS PRECEDENT TO THE OBLIGATIONS OF TCBX AND MERGER

SUB

Section 8.01

Representations and Warranties

Section 8.02

Performance of Obligations

Section 8.03

Shareholder Approvals

Section 8.04

Government and Other Approvals

Section 8.05

No Litigation

Section 8.06

Releases

Section 8.07

No Material Adverse Change

Section 8.08

Termination of Employee Plans

Section 8.09

Employment Agreements

Section 8.10

Registration Statement

Section 8.11

Dissenting Shareholders

Section 8.12

Delivery of Closing Documents

Section 8.13

Minimum Adjusted Equity

Section 8.14

FIRPTA Certificate

Section 8.15

Federal Tax Opinion

Section 8.16

Tail Policy

Section 8.17

Payoff Documentation

ARTICLE IX TERMINATION

Section 9.01

Right of Termination

Section 9.02

Notice of Termination

Section 9.03

Effect of Termination

-iv-

TABLE OF CONTENTS

(continued)

Page

ARTICLE X GENERAL PROVISIONS

Section 10.01

Nonsurvival of Representations, Warranties, Covenants and Agreements

Section 10.02

Expenses

Section 10.03

Brokerage Fees and Commissions

Section 10.04

Entire Agreement

Section 10.05

Binding Effect; Assignment

Section 10.06

Further Cooperation

Section 10.07

Severability

Section 10.08

Notices

Section 10.09

GOVERNING LAW

Section 10.10

WAIVER OF JURY TRIAL

Section 10.11

Multiple Counterparts

Section 10.12

Definitions

Section 10.13

Specific Performance

Section 10.14

Attorneys’ Fees and Costs

Section 10.15

Rules of Construction

Section 10.16

Articles, Sections, Exhibits and Schedules

Section 10.17

Public Disclosure

Section 10.18

Extension; Waiver

Section 10.19

Amendment

Section 10.20

No Third Party Beneficiaries

Section 10.21

Confidential Supervisory Information

-v-

EXHIBITS

Exhibit “A”

Form of Voting Agreement

Exhibit “B”

Form of Director Support Agreement

Exhibit “C”

Form of Bank Merger Agreement

Exhibit “D”

Form of Director Release

Exhibit “E”

Form of Officer Release

-vi-

AGREEMENT AND PLAN OF REORGANIZATION

This AGREEMENT AND PLAN OF REORGANIZATION (this “Agreement”) is effective as of October 6, 2026, by and among

Third Coast Bancshares, Inc. (“TCBX”), a Texas corporation and registered bank holding company under the Bank Holding Company Act of 1956, as amended (the “BHCA”), Thunder Merger Sub, Inc. (“Merger

Sub”), an Oklahoma corporation and wholly owned subsidiary of TCBX, and Great Plains Bancshares, Inc. (“Great Plains”), an Oklahoma corporation and registered bank holding company under the BHCA.

RECITALS

WHEREAS,

TCBX owns all of the common stock of Third Coast Bank, a Texas banking association with its principal office in Humble, Texas (“TCB”);

WHEREAS, Great Plains owns all of the common stock of Great Plains National Bank, a national banking association with its principal office in

Elk City, Oklahoma (the “Bank”);

WHEREAS, the Board of Directors of TCBX (the “TCBX Board”) and the

Board of Directors of Great Plains (the “Great Plains Board”) have determined that it is advisable and in the best interests of their respective companies and their shareholders to consummate the strategic business combination

transaction provided for in this Agreement;

WHEREAS, on the terms and subject to the conditions set forth in this Agreement, TCBX will

acquire Great Plains through the merger of Merger Sub with and into Great Plains (the “Merger”), with Great Plains surviving as a wholly owned subsidiary of TCBX;

WHEREAS, immediately following, and in connection with, the Merger, TCBX will cause Great Plains to be merged with and into TCBX, with TCBX

surviving the merger (the “Second Step Merger” and together with the Merger, the “Integrated Mergers”), and immediately following the Second Step Merger, or at such later time as TCBX may determine, TCBX will

cause the Bank to be merged with and into TCB, with TCB surviving the merger (the “Bank Merger”);

WHEREAS, following

the Bank Merger, TCB will use the name “Great Plains Bank, a division of Third Coast Bank” at the former branches of the Bank;

WHEREAS, concurrently with the execution and delivery of this Agreement, as a condition and inducement for TCBX to enter into this Agreement,

certain shareholders of Great Plains have each entered into a Voting Agreement in the form attached hereto as Exhibit “A” (the “Voting Agreement”), whereby such shareholders of Great Plains have agreed to vote

the shares of Great Plains Stock (as defined below) owned by them in favor of this Agreement, the Merger and the transactions contemplated hereby and thereby;

WHEREAS, concurrently with the execution and delivery of this Agreement, as a condition and inducement for TCBX to enter into this Agreement,

each of the directors of Great Plains and the Bank have entered into Director Support Agreements in the form attached hereto as Exhibit “B” (the “Director Support Agreement”) in connection

with the Merger;

WHEREAS, concurrently with the execution and delivery of this Agreement, as a condition and

inducement for TCBX to enter into this Agreement, the executive officers of Great Plains and/or the Bank set forth on TCBX Confidential Schedule 8.09 have entered into employment

agreements with TCBX and/or TCB in connection with the Merger;

WHEREAS, it is intended that the Integrated Mergers together will be

treated as a single integrated transaction as described in Rev. Rul. 2001-46, 2001-2 C.B. 321, that qualifies as a “reorganization” under Section 368(a)

of the Internal Revenue Code of 1986, as amended (the “Code”) and the Treasury Regulations promulgated thereunder, and this Agreement is a “plan of reorganization” within the meaning of Treasury Regulations §§1.368-2(g) and 1.368-3(a) for purposes of Sections 354, 356, 361 and 368 of the Code (and any comparable provision of state Law); and

WHEREAS, the parties hereto desire to set forth certain representations, warranties and covenants made by each to the other as an inducement

to the execution and delivery of this Agreement and certain additional agreements related to the transactions contemplated hereby:

AGREEMENT

NOW,

THEREFORE, for and in consideration of the foregoing and of the mutual representations, warranties, covenants and agreements contained in this Agreement, and other good and valuable consideration, the receipt and sufficiency of which are hereby

acknowledged, and subject to the conditions set forth below, the parties, intending to be legally bound, undertake, promise, covenant and agree with each other as follows:

ARTICLE I

THE

MERGER

Section 1.01 Merger of Merger Sub with and into Great Plains. Subject to the terms and conditions of this

Agreement, at the Effective Time, Merger Sub will merge with and into Great Plains in accordance with the provisions of Section 1081 of the Oklahoma General Corporation Act (the “OGCA”). Great Plains will be the surviving

corporation in the Merger (the “Surviving Corporation”) and will continue its corporate existence under the OGCA. Upon consummation of the Merger, the separate corporate existence of Merger Sub shall terminate.

Section 1.02 Effects of the Merger. The Merger will have the effects set forth in the OGCA. The name of the Surviving Corporation

will be “Great Plains Bancshares, Inc.”

Section 1.03 Certificate of Incorporation and Bylaws. At the Effective

Time, the certificate of incorporation and bylaws of Great Plains, as in effect immediately before the Effective Time, will be the certificate of incorporation and bylaws of the Surviving Corporation until thereafter changed or amended as provided

by Law.

Section 1.04 Directors and Officers. The directors and officers, respectively, of Merger Sub at the Effective Time

will become the directors and officers of the Surviving Corporation and will hold office from the Effective Time until their respective successors are duly elected or appointed and qualified in the manner provided in the certificate of incorporation

and bylaws of the Surviving Corporation or as otherwise provided by Law.

Section 1.05 Effect on Capital Stock. At the Effective Time, by virtue of the

Merger and without any further action on the part of TCBX, Merger Sub, Great Plains or any holder of record of the following securities:

(a) Each share of common stock, par value $1.00 per share, of TCBX (“TCBX Common Stock”), non-voting common stock, par value $1.00 per share, of TCBX (“TCBX Non-Voting Common Stock”), Series A Convertible

Non-Cumulative Preferred Stock, par value $1.00 per share, of TCBX (“Series A Preferred Stock”), and Series B Convertible Perpetual Preferred Stock, par value $1.00

per share, of TCBX (“Series B Preferred Stock”), issued and outstanding immediately prior to the Effective Time, shall remain issued and outstanding and shall not be affected by the Merger.

(b) Each share of common stock, par value $1.00 per share, of Great Plains (the “Great Plains Stock”) issued

and outstanding immediately prior to the Effective Time, except for the Cancelled Shares and Dissenting Shares, shall cease to be outstanding and shall automatically be converted into and become the right to receive, without interest, a number of

shares of TCBX Common Stock equal to the Exchange Ratio (such per share amount, the “Per Share Merger Consideration,” and in the aggregate for all holders of Great Plains Stock entitled to receive the Per Share Merger

Consideration under the terms of this Agreement, the “Merger Consideration”).

Time, each share of Great Plains Stock converted into the right to receive the Per Share Merger Consideration pursuant to this Section 1.05 shall no longer be outstanding and shall automatically be cancelled and cease to

exist, and each holder of a certificate that immediately prior to the Effective Time represented any such shares of Great Plains Stock shall thereafter cease to have any rights with respect to such shares of Great Plains Stock, except the right to

receive the Per Share Merger Consideration for such shares.

(d) Any shares of Great Plains Stock that are owned

immediately prior to the Effective Time by Great Plains, TCBX or their respective Subsidiaries (other than (i) shares of Great Plains Stock held, directly or indirectly, in trust accounts, managed accounts and the like or otherwise held in a

fiduciary capacity that are beneficially owned by third parties and (ii) shares of Great Plains Stock held in respect of a debt previously contracted) shall be canceled and extinguished without any conversion thereof or consideration therefor

(the “Cancelled Shares”).

(e) No certificates representing a fractional share of TCBX Common Stock

shall be issued by TCBX. In lieu of any fractional share, each holder of Great Plains Stock entitled to a fractional share, upon surrender of such shares of Great Plains Stock, shall be entitled to receive from TCBX an amount in cash (without

interest), payable in accordance with Section 1.07, rounded to the nearest cent, determined by multiplying the fractional share by the TCBX Closing VWAP.

(f) Notwithstanding anything to the contrary herein, if, between the date

hereof and the Effective Time, the outstanding shares of TCBX Common Stock increase, decrease, change into or are exchanged for a different number or kind of shares or securities as a result of a reorganization, recapitalization, reclassification,

stock dividend, stock split, reverse stock split, or other similar change in capitalization (a “Share Adjustment”), then the Exchange Ratio shall be appropriately and proportionately adjusted so that each holder of Great Plains

Stock shall be entitled to receive the Merger Consideration in such proportion as it would have received if the record date for such Share Adjustment had been immediately after the Effective Time.

(g) Each share of common stock, par value $1.00 per share, of Merger Sub issued and outstanding immediately prior to the

Effective Time shall be converted automatically into and become one newly issued, fully paid and non-assessable share of common stock of the Surviving Corporation.

Section 1.06 Calculation of Consideration.

(a) For purposes of this Agreement, the following terms shall have the meanings set forth below:

(i) “Adjusted Equity” means, except as set forth on TCBX Confidential Schedule 1.06(a)(i), the

sum of Great Plains’ capital, surplus and retained earnings accounts less all intangible assets, calculated on a consolidated basis as of the Calculation Time and in accordance with generally accepted accounting principles of the United States

(“GAAP”) consistently applied (“Great Plains Equity”), and adjusted to reflect the payment of or accrual for all Great Plains Merger Costs.

(ii) “Aggregate Adjusted Consideration” means a number of shares of TCBX Common Stock equal to the

difference of (A) 5,570,352, minus (B) the number of shares of TCBX Common Stock, rounded to the nearest whole share, equal to the quotient of (A) the Equity Adjustment, divided by (B) the TCBX Closing VWAP.

(iii) “Calculation Date” means the fifth Business Day immediately preceding the Closing Date, or such other

date as mutually agreed to by the parties hereto.

(iv) “Calculation Time” means the close of business

on the Calculation Date.

(v) “Equity Adjustment” means the difference of (A) Minimum Adjusted

Equity, minus (B) Adjusted Equity; provided, that if the amount of the Adjusted Equity is greater than the Minimum Adjusted Equity, then the Equity Adjustment shall be zero.

(vi) “Exchange Ratio” means the number of shares of TCBX

Common Stock, rounded to the nearest ten thousandth of a share, equal to the quotient of (A) 5,570,352, divided by (B) the number of shares of Great Plains Stock issued and outstanding immediately prior to the Effective Time, except for

the Cancelled Shares and Dissenting Shares; provided, however, that if the Equity Adjustment is greater than zero, then the Exchange Ratio shall mean a number of shares of TCBX Common Stock, rounded to the nearest ten thousandth of a share, equal to

the quotient of (A) the Aggregate Adjusted Consideration, divided by (B) the number of shares of Great Plains Stock issued and outstanding immediately prior to the Effective Time, except for the Cancelled Shares and Dissenting Shares.

(vii) “Great Plains Merger Costs” means, to the extent not already reflected in the Great Plains Equity as

of the Calculation Time, (A) the cost of terminating any employment related agreements and obligations (including any non-competition agreements, option agreements or equity based plans); (B) the

transaction costs, fees and expenses (including, without limitation, all legal, accounting, and financial advisory fees and expenses, including any cost to obtain any opinion as to the financial fairness of the Merger) incurred by Great Plains;

(C) the payments owed by Great Plains to those employees and in such amounts listed on Great Plains Confidential Schedule 1.06(a)(vii)(C), including, without limitation any severance,

stay-pay or retention bonus amounts or change in control payments not being paid by TCBX (all of which shall be reflected on Great Plains Confidential

Schedule 1.06(a)(vii)(C) including the name of the recipient and the amount of such payment, the terms of which shall be governed by the retention agreements contemplated by

Section 5.25); (D) the cost of the Tail Policy; (E) a mutually agreeable estimate of the cost of obtaining a determination letter from the Internal Revenue Service (“IRS”) in connection with the

termination of a Retirement Plan; (F) any federal or state income Tax obligations, franchise Tax obligations or property Tax obligations of Great Plains and/or any of its Subsidiaries imposed with respect to any Tax year or period (or portion

thereof) ending on or prior to the Closing Date; (G) the accrual or payment of all of the costs, fees, expenses, contract payments and penalties or liquidated damages necessary to be paid by Great Plains in connection with any contract

termination required pursuant to this Agreement, including, without limitation, all costs, fees, expenses, contract payments and penalties or liquidated damages associated with the termination of the data processing, technology and other contracts

contemplated by Section 5.15 hereof; (H) a mutually agreeable estimate of the cost of preparing the federal and state income and franchise Tax Returns of Great Plains and its Subsidiaries for the period from

January 1, 2026 through the Closing Date; (I) the costs to fully fund, terminate and liquidate any Employee Plan and to pay all related expenses and fees, including expenses and fees associated with any governmental filings in connection

with such termination, to the extent such termination is required hereunder or requested by TCBX hereunder; and (J) any other amounts mutually agreed upon in writing by TCBX and Great Plains. In addition, any dividends (whether paid or

declared) by Great Plains shall have been recorded by Great Plains as a reduction of Adjusted Equity.

(viii)

“Minimum Adjusted Equity” means $153,300,000.

Section 1.07 Exchange Procedures.

(a) Prior to the Effective Time, TCBX shall appoint an exchange agent (the “Exchange Agent”) to act as the

exchange agent hereunder.

(b) At or prior to the Effective Time, TCBX shall deposit with or make available to the Exchange

Agent, for the benefit of the holders of Certificates, for exchange in accordance with this Section 1.07, (i) certificates or, at TCBX’s option, evidence of shares in book entry form, representing the shares of

TCBX Common Stock to be issued pursuant to Section 1.05(b), and (ii) cash in an amount sufficient to pay cash in lieu of any fractional shares (such shares of TCBX Common Stock and cash described in the foregoing

clauses (i) and (ii), the “Exchange Fund”).

Time, but in no event later than five (5) Business Days thereafter, and subject to the receipt by the Exchange Agent of a list of Great Plains’ shareholders in a format that is reasonably acceptable to the Exchange Agent, TCBX shall cause

the Exchange Agent to mail to each holder of record immediately prior to the Effective Time of certificates (other than with respect to Cancelled Shares and Dissenting Shares) representing shares of Great Plains Stock (each, a

“Certificate”, it being understood that any reference herein to “Certificate” shall be deemed to include reference to book-entry account statements relating to the ownership of shares of Great Plains Stock), (i) a

letter of transmittal (which shall specify that delivery shall be effected, and risk of loss and title to each Certificate shall pass, only upon delivery of such Certificate (or an affidavit of loss in lieu of such Certificate and, if reasonably

required by TCBX or the Exchange Agent, the posting by such holder of Great Plains Stock of a bond in such amount as TCBX may determine is reasonably necessary as indemnity against any claim that may be made against it with respect to such

Certificate)) to the Exchange Agent and shall be substantially in such form and have such other provisions as shall be prescribed by the agreement with the Exchange Agent (the “Letter of Transmittal”) and (ii) instructions

for use in surrendering each Certificate in exchange for the Per Share Merger Consideration, any cash in lieu of a fractional share of TCBX Common Stock to be issued or paid in consideration therefor and any dividends or distributions to which such

holder is entitled pursuant to this Section 1.07. The Great Plains shareholders will be entitled to receive their Per Share Merger Consideration only after receipt by the Exchange Agent of a properly completed Letter of

Transmittal. If a Letter of Transmittal contains an error, is incomplete or is not accompanied by all appropriate Certificates, then the Exchange Agent will notify that Great Plains shareholder promptly of the need for further information or

documentation.

(d) Within five (5) Business Days after surrender to the Exchange Agent of its Certificate or

Certificates, accompanied by a properly completed Letter of Transmittal, or within five (5) Business Days after the Effective Time for any uncertificated shares of Great Plains Stock held of record in book-entry form (subject to receipt of any

customary Tax documentation that may be reasonably requested by the Exchange Agent), the Exchange Agent shall deliver to such holder of Great Plains Stock the Per Share Merger Consideration and any cash in lieu of a fractional share of TCBX Common

Stock to be issued or paid with respect to each share of Great Plains Stock represented by the Certificate, and each Certificate surrendered will be canceled. TCBX may, at its option,

deliver any shares of TCBX Common Stock in book-entry form. Until so surrendered, each Certificate shall represent after the Effective Time, for all purposes, only the right to receive, without

interest, the Per Share Merger Consideration and any cash in lieu of a fractional share of TCBX Common Stock to be issued or paid in consideration therefor upon surrender of such Certificate in accordance with this

Section 1.07, and any dividends or distributions to which such holder is entitled pursuant to this Section 1.07.

(e) No dividends or other distributions with respect to TCBX Common Stock shall be paid to the holder of any unsurrendered

Certificate with respect to the shares of TCBX Common Stock represented thereby, in each case unless and until the surrender of such Certificate in accordance with this Section 1.07. Subject to the effect of applicable

abandoned property, escheat or similar Laws, following surrender of any such Certificate in accordance with this Section 1.07, the record holder thereof shall be entitled to receive, without interest, (i) the amount of

dividends or other distributions with a record date after the Effective Time theretofore payable with respect to the whole shares of TCBX Common Stock represented by such Certificate and not paid and/or (ii) at the appropriate payment date, the

amount of dividends or other distributions payable with respect to shares of TCBX Common Stock represented by such Certificate with a record date after the Effective Time (but before such surrender date) and with a payment date subsequent to the

issuance of the TCBX Common Stock issuable with respect to such Certificate.

(f) In the event of a transfer of ownership

of a Certificate representing Great Plains Stock prior to the Effective Time that is not registered in the stock transfer records of Great Plains, the Per Share Merger Consideration and any cash in lieu of a fractional share of TCBX Common Stock to

be issued or paid in consideration therefor shall be issued or paid in exchange therefor to a person other than the person in whose name the Certificate so surrendered is registered if the Certificate formerly representing such Great Plains Stock

shall be properly endorsed or otherwise be in proper form for transfer and the person requesting such payment or issuance shall pay any transfer or other similar Taxes required by reason of the payment or issuance to a person other than the

registered holder of the Certificate or establish to the satisfaction of TCBX and the Exchange Agent that the Tax has been paid or is not applicable.

(g) TCBX, the Exchange Agent and any other applicable withholding agent, as the case may be, shall be entitled to deduct and

withhold from any amounts payable pursuant to this Agreement to any Person any such amounts as TCBX, the Exchange Agent or such other withholding agent, as the case may be, reasonably determines that it is required to deduct and withhold under the

Code or any other provision of Law. To the extent that amounts are so deducted or withheld, such amounts shall be remitted to the appropriate Governmental Entity and shall be treated for all purposes of this Agreement as having been paid to such

Person in respect of which such deduction and withholding was made.

(h) Any portion of the Exchange Fund that remains

unclaimed by the shareholders of Great Plains at the expiration of six (6) months after the Effective Time shall be paid to TCBX. In such event, any former shareholders of Great Plains who have not theretofore complied with this

Section 1.07 shall thereafter look only to TCBX with respect to the Per Share Merger Consideration, any cash in lieu of any fractional shares and any unpaid dividends and distributions on the TCBX Common Stock deliverable

in respect of each share represented by a Certificate such shareholder holds as determined pursuant to this Agreement, in each case, without any interest thereon.

(i) Any other provision of this Agreement notwithstanding, none of TCBX, the

Surviving Corporation or the Exchange Agent shall be liable to a holder of Great Plains Stock for any amounts paid or property delivered in good faith to a public official pursuant to any applicable abandoned property, escheat or similar Law.

Section 1.08 Tax Treatment. For U.S. federal income Tax purposes, it is intended that the Integrated Mergers together be treated

as a single integrated transaction as described in Rev. Rul. 2001-46, 2001-2 C.B. 321, that qualifies as a “reorganization” within the meaning of

Section 368(a) of the Code, and that this Agreement shall constitute, and is hereby adopted as, a “plan of reorganization” within the meaning of Treasury Regulation Section 1.368-2(g). From and after the date of this Agreement

and until the Closing Date, each party hereto shall (and shall cause its Affiliates to) use commercially reasonable efforts to cause the Integrated Mergers to so qualify, and will not knowingly take any action, cause any action to be taken, fail to

take any action or cause any action not to be taken, which action or failure to act would reasonably be expected to prevent the Integrated Mergers from qualifying as a “reorganization” within the meaning of Section 368(a) of the

Code.

Section 1.09 Modification of Structure. Notwithstanding any provision of this Agreement to the contrary, TCBX may

elect, subject to the filing of all necessary applications and the receipt of all required regulatory approvals, to modify the structure of the transactions contemplated hereby so long as (a) there are no material adverse federal or state

income Tax consequences to the holders of Great Plains Stock as a result of such modification, (b) the after-Tax consideration to be paid to the holders of Great Plains Stock is not changed in kind or

reduced in amount, and (c) such modification will not be likely to materially delay or jeopardize receipt of any required regulatory approvals or the Closing.

Section 1.10 Dissenting Shareholders.

(a) Notwithstanding anything in this Agreement to the contrary, no Person who has prior to the Effective Time perfected a

demand for appraisal rights pursuant to Section 1091 of the OGCA (a “Dissenting Shareholder”) with respect to any shares of Great Plains Stock held by such Dissenting Shareholder (“Dissenting Shares”) shall

be entitled to receive the Per Share Merger Consideration with respect to such Dissenting Shares unless and until such Dissenting Shareholder shall have effectively withdrawn (in accordance with the applicable provisions of the OGCA) or lost such

Person’s right to appraisal under the OGCA with respect to such Dissenting Shares. Unless and until a Dissenting Shareholder shall have effectively so withdrawn or lost such Dissenting Shareholder’s right to appraisal under the OGCA with

respect to Dissenting Shares, such Dissenting Shareholder shall be entitled to receive only payment of the fair value of such Dissenting Shares as required by Section 1091 of the OGCA (including any interest thereon and related costs, if any,

required to be paid in accordance with Section 1091 of the OGCA). Great Plains shall give TCBX (i) prompt written notice of any written demands

for payment of fair value, attempted withdrawals of such demands, and any other instruments served pursuant to applicable Law that are received by Great Plains prior to the Effective Time in

accordance with the provisions of Section 1091 of the OGCA relating to Great Plains shareholders’ appraisal rights and (ii) the opportunity to participate in and control all negotiations and proceedings with respect to demands for

payment of fair value by Great Plains shareholders under Section 1091 of the OGCA. Great Plains shall not, except with the prior written consent of TCBX (which shall not be unreasonably withheld, conditioned or delayed), make any payment with

respect to any such dissent or demands for payment of fair value, offer to settle or settle any such demands. Any payment required to be made with respect to the Dissenting Shares shall be made by TCBX. From and after the Effective Time, Dissenting

Shares shall not be entitled to vote for any purpose or be entitled to the payment of dividends or other distributions (except dividends or other distributions payable to shareholders of record prior to the Effective Time).

(b) If any shareholder who holds Dissenting Shares effectively withdraws or loses (through failure to perfect or otherwise)

such shareholder’s right to appraisal under the OGCA, then, as of the later of the Effective Time and the occurrence of such effective withdrawal or loss, such shareholder’s shares of Great Plains Stock shall no longer be Dissenting

Shares and shall be automatically converted into the right to receive the Per Share Merger Consideration, without interest, as set forth in this ARTICLE I, it being understood that surrender of the Certificate representing

such Dissenting Shares shall be a prerequisite to the receipt of payment in respect of any Dissenting Shares represented thereby.

Section 1.11 Treatment of Deferred Compensation Plans.

(a) Prior to or concurrently with the Closing, Great Plains shall cause the agreements as set forth on Great Plains

Confidential Schedule 1.11 (the “Deferred Compensation Plans”), to be terminated in their entirety in connection with the Closing in accordance with the plan termination provisions set forth in Treasury Regulations Section 1.409A-3(j)(4)(ix)(B).

(b) All payments to participants under the Deferred

Compensation Plans in connection with the Closing or such termination, determined in accordance with the terms of the applicable Deferred Compensation Plans and identified on Great Plains Confidential Schedule 1.11, including all

amounts payable as a result of or in connection with a change in control or other acceleration of vesting, any transaction-value remeasurement, the termination or settlement of the Deferred Compensation Plans, or the occurrence or consummation of

the transactions contemplated by this Agreement, shall be paid by TCBX or TCB to such participants no later than ten (10) Business Days following the Closing Date. Great Plains shall use commercially reasonable efforts to obtain each such

participant’s execution (and non-revocation within any applicable revocation period) of an acknowledgement and release of all claims under the Deferred Compensation Plans in favor of Great Plains and its

Affiliates, in a form reasonably satisfactory to TCBX (each, a “Deferred Compensation Plan Release”). Great Plains shall provide TCBX with evidence of such actions to effect the termination of the plans and copies of all executed

Deferred Compensation Plan Releases obtained by Great Plains within two (2) days prior to the Closing.

Section 1.12 Second Step Merger. On the Closing Date and as soon as reasonably

practicable following the Effective Time, in accordance with the Texas Business Organizations Code (the “TBOC”) and the OGCA, TCBX shall cause the Surviving Corporation to be merged with and into TCBX in the Second Step Merger,

with TCBX surviving the Second Step Merger and continuing its existence under the Laws of the State of Texas, and the separate corporate existence of the Surviving Corporation ceasing as of the Second Effective Time. In furtherance of the foregoing,

TCBX shall cause to be filed with the Secretary of State of the State of Texas, in accordance with the TBOC, and the Secretary of State of the State of Oklahoma, in accordance with the OGCA, a certificate of merger relating to the Second Step Merger

(the “Second Certificate of Merger”). The Second Step Merger shall become effective as of the date and time specified in the Second Certificate of Merger (such date and time, the “Second Effective Time”). At and

after the Second Effective Time, the Second Step Merger shall have the effects set forth in the applicable provisions of the TBOC and the OGCA.

Section 1.13 Bank Merger. Immediately following the Second Step Merger, or at such later time as TCBX may determine in its sole

discretion, TCBX will cause the Bank Merger on the terms and subject to the terms and conditions set forth in the Bank Merger Agreement attached hereto as Exhibit “C” (the “Bank Merger

Agreement”). TCB shall be the surviving entity in the Bank Merger and, following the Bank Merger, the separate corporate existence of the Bank shall cease. The parties agree that the Bank Merger will become effective immediately after the

Second Effective Time or at such later time as TCBX may determine. Prior to or on the date of this Agreement, the board of directors of each of TCB and the Bank have approved the Bank Merger Agreement and TCB and the Bank entered into the Bank

Merger Agreement. In furtherance of the foregoing, the parties shall execute and cause to be filed applicable articles or certificates of merger and such other documents as are necessary to effectuate the Bank Merger.

ARTICLE II

THE

CLOSING AND THE CLOSING DATE

Section 2.01 Time and Place of the Closing and Closing Date.

(a) On a date mutually acceptable to TCBX and Great Plains within thirty (30) days after the receipt of all necessary

regulatory, corporate and other approvals and the expiration of any mandatory waiting periods (the “Closing Date”), as may be extended by mutual agreement of the parties for a reasonable period to facilitate a Calculation Date on month-end in the event the parties so agree, a meeting will take place at which the parties to this Agreement will exchange certificates, letters and other documents, which may be conducted electronically, in order

to determine whether all of the conditions set forth in ARTICLE VII and ARTICLE VIII have been satisfied or waived or whether any condition exists that would permit a party to this Agreement to

terminate this Agreement. If none of the foregoing conditions then exists or if no party elects to exercise any right it may have to terminate this Agreement, then the parties will execute such documents and instruments as may be necessary or

appropriate in order to effect the Merger and the other transactions contemplated by this Agreement (the “Closing”).

(b) The Merger and other transactions contemplated by this Agreement shall

become effective on the date and at the time specified in the certificate of merger, reflecting the Merger, filed with the Secretary of State of the State of Oklahoma in accordance with the OGCA (the “Effective Time”). The parties

will use their commercially reasonable efforts to cause the Effective Time to occur on the same date as the Closing Date, but in no event will the Effective Time occur more than one (1) day after the Closing Date.

Texas 75201 at 10:00 a.m. on the Closing Date, or at such other time and place to which the parties may agree.

Section 2.02

Actions to be Taken at the Closing by Great Plains. At the Closing, Great Plains will execute and acknowledge, or cause to be executed and acknowledged, and deliver to TCBX such documents and certificates contemplated to be delivered pursuant

to this Agreement or reasonably necessary to evidence the transactions contemplated by this Agreement, including the following (all of such actions constituting conditions precedent to the obligations of TCBX to close hereunder):

(a) True, correct and complete copies of Great Plains’ certificate of incorporation and all amendments thereto, duly

certified as of a recent date by the Secretary of State of the State of Oklahoma;

(b) True, correct and complete copies of

the Bank’s articles of association and all amendments thereto, duly certified as of a recent date by the OCC;

certificate of good standing from the Secretary of State of the State of Oklahoma, duly certifying as of a recent date as to the good standing of Great Plains under the Laws of the State of Oklahoma;

(d) A certificate of corporate existence from the OCC, duly certifying as of a recent date that the Bank was authorized to

transact the business of banking on the date such certificate was issued;

(e) A certification of charter from the OCC,

duly certifying as of a recent date that a copy of the Bank’s charter certificate is attached;

(f) A certificate,

dated as of the Closing Date, executed by the secretary or other appropriate executive officer of Great Plains, pursuant to which such officer will certify: (i) the due adoption by the Great Plains Board of corporate resolutions attached to

such certificate authorizing the execution and delivery of this Agreement and the other agreements and documents contemplated hereby and the taking of all actions contemplated hereby and thereby; (ii) the due adoption and approval by the

shareholders of Great Plains of this Agreement; (iii) the incumbency and true signatures of those officers of Great Plains duly authorized to act on its behalf in connection with the transactions contemplated by this Agreement and to execute

and deliver this Agreement and the other agreements and documents contemplated hereby and thereby; (iv) that the copy of the bylaws of Great Plains attached to such certificate is true and correct and such bylaws have not been amended except as

reflected in such copy; and (v) a true and correct copy of the list of the holders of Great Plains Stock as of the Closing Date;

(g) A certificate, dated as of the Closing Date, executed by the secretary

or other appropriate executive officer of the Bank, pursuant to which such officer will certify: (i) the due adoption by the board of directors of the Bank of corporate resolutions attached to such certificate authorizing the execution and

delivery of the Bank Merger Agreement and the other agreements and documents contemplated thereby and the taking of all actions contemplated thereby; (ii) the due adoption by the sole shareholder of the Bank of resolutions authorizing the Bank

Merger, the Bank Merger Agreement and the transactions contemplated by the Bank Merger Agreement, (iii) the incumbency and true signatures of those officers of the Bank duly authorized to act on its behalf in connection with the transactions

contemplated by the Bank Merger Agreement and to execute and deliver the Bank Merger Agreement and the other agreements and documents contemplated thereby; and (iv) that the copy of the bylaws of the Bank attached to such certificate is true

and correct and such bylaws have not been amended except as reflected in such copy;

(h) A certificate, dated as of the

Closing Date, executed by the chief executive officer of Great Plains, pursuant to which Great Plains will certify that (i) Great Plains has satisfied the conditions set forth in Section 8.01 and

Section 8.02; and (ii) except as expressly permitted by this Agreement, there has been no Material Adverse Change with respect to Great Plains or any of its Subsidiaries, individually or in the aggregate since

December 31, 2025;

(i) All consents required from third parties to complete the transactions contemplated by this

Agreement, including those listed on Great Plains Confidential Schedule 2.02(i);

(j) All releases as required under Section 8.06;

(k) The FIRPTA Certificate;

(l) A certificate, dated as of the Closing Date, executed by the chief financial officer of Great Plains certifying the amount

of the Adjusted Equity of Great Plains as of the Calculation Time and that the Adjusted Equity was calculated in accordance with the terms of this Agreement; and

(m) All other documents required to be delivered to TCBX under this Agreement, and all other documents, certificates and

instruments as are reasonably requested by TCBX or its counsel.

Section 2.03 Actions to be Taken at the Closing by TCBX. At the Closing, TCBX

will execute and acknowledge, or cause to be executed and acknowledged, and deliver to Great Plains such documents and certificates contemplated to be delivered pursuant to this Agreement or reasonably necessary to evidence the transactions

contemplated by this Agreement, including the following (all of such actions constituting conditions precedent to the obligations of Great Plains to close hereunder):

(a) True, correct and complete copies of TCBX’s certificate of formation and all amendments thereto, duly certified as of

a recent date by the Secretary of State of the State of Texas;

(b) A certificate of good standing from the Secretary of

State of the State of Texas, duly certifying as of a recent date as to the good standing of TCBX under the Laws of the State of Texas;

(c) A certificate, dated as of the Closing Date, executed by the secretary or other appropriate executive officer of TCBX,

pursuant to which such officer will certify: (i) the due adoption by the TCBX Board of corporate resolutions attached to such certificate authorizing the execution and delivery of this Agreement and the other agreements and documents

contemplated hereby, and the taking of all actions contemplated hereby and thereby; (ii) the approval by the shareholders of TCBX of the TCBX Share Issuance; (iii) the incumbency and true signatures of those officers of TCBX duly

authorized to act on its behalf in connection with the transactions contemplated by this Agreement and to execute and deliver this Agreement and the other agreements and documents contemplated hereby and thereby; and (iv) that the copy of the

bylaws of TCBX attached to such certificate is true and correct and such bylaws have not been amended except as reflected in such copy;

(d) A certificate, dated as of the Closing Date, executed by the secretary or other appropriate executive officer of TCB,

pursuant to which such officer will certify: (i) the due adoption by the board of directors of TCB of corporate resolutions attached to such certificate authorizing the execution and delivery of the Bank Merger Agreement and the other

agreements and documents contemplated thereby and the taking of all actions contemplated thereby; (ii) the due adoption by the sole shareholder of TCB of resolutions authorizing the Bank Merger, the Bank Merger Agreement and the transactions

contemplated by the Bank Merger Agreement; (iii) the incumbency and true signatures of those officers of TCB duly authorized to act on its behalf in connection with the transactions contemplated by the Bank Merger Agreement and to execute and

deliver the Bank Merger Agreement and the other agreements and documents contemplated thereby; and (iv) that the copy of the bylaws of TCB attached to such certificate is true and correct and such bylaws have not been amended except as

reflected in such copy;

(e) A certificate, dated as of the Closing Date, executed by the chief executive officer of TCBX,

pursuant to which TCBX will certify that (i) TCBX has satisfied the conditions set forth in Section 7.01 and Section 7.02; and (ii) except as expressly permitted by this Agreement, there

has been no Material Adverse Change with respect to TCBX since December 31, 2025;

(f) All consents required from

third parties to complete the transactions contemplated by this Agreement, including those listed on TCBX Confidential Schedule 2.03(f); and

(g) All other documents required to be delivered to Great Plains by TCBX

under this Agreement, and all other documents, certificates and instruments as are reasonably requested by Great Plains or its counsel.

ARTICLE III

REPRESENTATIONS AND WARRANTIES OF GREAT PLAINS

Except as disclosed in the disclosure schedules delivered by Great Plains to TCBX prior to the execution hereof (the “Great Plains

Confidential Schedules”); provided, that (a) no such item is required to be set forth as an exception to a representation or warranty if its absence would not result in the related representation or warranty being deemed untrue or

incorrect, (b) the mere inclusion of an item in the Great Plains Confidential Schedules as an exception to a representation or warranty shall not be deemed an admission by Great Plains that such item represents a material exception or fact,

event or circumstance or that such item is reasonably likely to result in a Material Adverse Change with respect to Great Plains, and (c) any disclosures made with respect to a section of this ARTICLE III shall be

deemed to qualify (1) any other section of this ARTICLE III specifically referenced or cross-referenced and (2) other sections of this ARTICLE III to the extent it is reasonably apparent

on its face (notwithstanding the absence of a specific cross reference) from a reading of the disclosure that such disclosure applies to such other sections, Great Plains hereby represents and warrants to TCBX as follows:

Section 3.01 Organization and Qualification.

(a) Great Plains is a corporation, duly organized, validly existing and in good standing under all Laws of the State of

Oklahoma and is a bank holding company registered under the BHCA. Great Plains has the corporate power and authority (including all licenses, franchises, permits and other governmental authorizations as are legally required) to carry on its business

as now being conducted, to own, lease and operate its properties and assets as now owned, leased or operated and to enter into and carry out its obligations under this Agreement. True and complete copies of the certificate of incorporation and

bylaws of Great Plains, as amended to date, certified by the Secretary of Great Plains, have been made available to TCBX. Except as set forth in Great Plains Confidential Schedule 3.01(a),

Great Plains does not own or control any Affiliate or Subsidiary, other than the Bank. The nature of the business of Great Plains and its activities do not require it to be qualified to do business in any jurisdiction other than the State of

Oklahoma. Great Plains has no equity interest, direct or indirect, in any other bank or corporation or in any partnership, joint venture or other business enterprise or entity, other than the Bank or as acquired through settlement of indebtedness,

foreclosure, the exercise of creditors’ remedies or in a fiduciary capacity, and the business carried on by Great Plains has not been conducted through any other direct or indirect Subsidiary or Affiliate of Great Plains other than the Bank.

(b) The Bank is a national banking association, duly organized and validly

existing under the Laws of the United States and in good standing under all Laws of the United States. The Bank has the corporate power and authority (including all licenses, franchises, permits and other governmental authorizations as are legally

required) to carry on its business as now being conducted, to own, lease and operate its properties and assets as now owned, leased or operated and to enter into and to carry on the business and activities now conducted by it. True and complete

copies of the articles of association and bylaws of the Bank, as amended to date, certified by the Secretary or Cashier of the Bank have been made available to TCBX. The Bank is an insured depository institution as defined in the Federal Deposit

Insurance Act, as amended (the “FDIA”). Except as set forth in Great Plains Confidential Schedule 3.01(b), the Bank does not own or control any Affiliate or Subsidiary. The nature of

the business of the Bank does not require it to be qualified to do business in any jurisdiction other than the State of Oklahoma. The Bank has no equity interest, direct or indirect, in any other bank or corporation or in any partnership, joint

venture or other business enterprise or entity, except as acquired through settlement of indebtedness, foreclosure, the exercise of creditors’ remedies or in a fiduciary capacity, and the business carried on by the Bank has not been conducted

through any other direct or indirect Subsidiary or Affiliate of the Bank.

Section 3.02 Authority; Execution and Delivery.

Great Plains has the full corporate power and authority to execute and deliver this Agreement and to consummate the transactions contemplated herein. The execution and delivery of this Agreement and the consummation of the Merger have been duly and

validly approved by the Great Plains Board. The Great Plains Board has determined that the Merger, on the terms and conditions set forth in this Agreement, is in the best interests of Great Plains and its shareholders and has directed that this

Agreement and the transactions contemplated hereby be submitted to Great Plains’ shareholders for adoption at a meeting of such shareholders with a recommendation from the Great Plains Board in favor of adoption (the “Great Plains

Recommendation”) and has adopted a resolution to the foregoing effect. Great Plains has taken all action necessary to authorize the execution, delivery and (provided the required regulatory and shareholder approvals are obtained)

performance of this Agreement and the other agreements and documents contemplated hereby to which it is a party. This Agreement has been, and the other agreements and documents contemplated hereby, have been or at Closing will be, duly executed by

Great Plains, and each constitutes the legal, valid and binding obligation of Great Plains, enforceable in accordance with its respective terms and conditions, except as enforceability may be limited by the Bankruptcy Exception.

Section 3.03 Capitalization. As of the date of this Agreement,

(a) The entire authorized capital stock of Great Plains consists solely of 24,500 shares of Great Plains Stock, of which 14,544

shares are issued and outstanding, and 3,290 shares are held as treasury stock. Except as set forth on Great Plains Confidential Schedule 3.03(a), there are no

(i) outstanding equity securities of any kind or character or (ii) outstanding subscriptions, options, convertible securities, rights, warrants, calls or other agreements or commitments of any kind issued or granted by, or binding upon,

Great Plains to purchase or otherwise acquire any security of or equity interest in Great Plains, obligating Great Plains to issue any shares of, restricting the transfer of or otherwise relating to shares of its capital stock of any class. All of

the issued and outstanding shares of Great Plains Stock have been duly authorized, validly issued and are fully paid and nonassessable, and have not been issued in violation of the preemptive rights of any Person. Such shares of Great Plains Stock

have been issued in compliance with the securities Laws of the United States and the states in which such shares of Great Plains Stock were issued.

There are no restrictions applicable to the payment of dividends on the shares of Great Plains Stock except pursuant to applicable Laws, and all dividends declared before the date of this

Agreement have been paid.

(b) The entire authorized capital stock of the Bank consists solely of 150,000 shares of common

stock, par value $10.00 per share, of the Bank (“Bank Stock”), all of which are issued and outstanding and no shares are held as treasury stock. There are no (i) outstanding equity securities of any kind or character or

(ii) outstanding subscriptions, options, convertible securities, rights, warrants, calls or other agreements or commitments of any kind issued or granted by, or binding upon, the Bank to purchase or otherwise acquire any security of or equity

interest in the Bank, obligating the Bank to issue any shares of, restricting the transfer of or otherwise relating to shares of its capital stock of any class. All of the issued and outstanding shares of Bank Stock have been duly authorized,

validly issued and are fully paid and nonassessable (subject to 12 U.S.C. § 55), and have not been issued in violation of the preemptive rights of any person. Such shares of Bank Stock have been issued in compliance with the securities Laws of

the United States and the State of Oklahoma. There are no restrictions applicable to the payment of dividends on the shares of Bank Stock except pursuant to applicable Laws, and all dividends declared before the date of this Agreement have been

paid.

Schedule 3.03(c), Great Plains owns, directly or indirectly, all the issued and outstanding shares of capital stock or other equity ownership interests of each of its Subsidiaries, free and clear of any Liens

whatsoever, and all such shares or equity ownership interests are duly authorized and validly issued and are fully paid, nonassessable and free of preemptive rights, with no personal liability attaching to the ownership thereof. No Subsidiary of

Great Plains has or is bound by any outstanding subscriptions, options, warrants, calls, rights, commitments or agreements of any character calling for the purchase or issuance of any shares of capital stock or any other equity security of such

Subsidiary or any securities representing the right to purchase or otherwise receive any shares of capital stock or any other equity security of such Subsidiary.

Section 3.04 Compliance with Laws, Permits and Instruments.

(a) Except as set forth on Great Plains Confidential

Schedule 3.04(a), Great Plains and each of its Subsidiaries have in all material respects performed and abided by all obligations required to be performed by it to the date hereof, and have complied with, and

are in compliance with, and is not in default (and with the giving of notice or the passage of time will not be in default) under, or in violation of, (i) any provision of the certificate of incorporation or articles of association of Great

Plains or any of its Subsidiaries, the bylaws or other governing documents of Great Plains or any of its Subsidiaries (collectively, the “Great Plains Constituent Documents”), (ii) any material provision of any mortgage,

indenture, lease, contract, agreement or other instrument applicable to Great Plains, its Subsidiaries or their respective assets, operations, properties or businesses, or (iii) any material Law or Order of any Governmental Entity applicable to

Great Plains or any of its Subsidiaries or their respective assets, operations, properties or businesses.

(b) Except as set forth on Great Plains

Confidential Schedule 3.04(b), the execution, delivery and performance of this Agreement (provided the required regulatory and shareholder approvals are obtained) and the other

agreements contemplated hereby, and the completion of the transactions contemplated hereby and thereby will not conflict with, or result, by itself or with the giving of notice or the passage of time, in any violation of or default or loss of a

benefit under, (i) the Great Plains Constituent Documents, (ii) any material mortgage, indenture, lease, contract, agreement or other instrument applicable to Great Plains or any of its Subsidiaries or their respective assets, operations,

properties or businesses or (iii) any material Law or Order of any Governmental Entity applicable to Great Plains or any of its Subsidiaries or their respective assets, operations, properties or businesses.

Section 3.05 Financial Statements.

(a) Great Plains has furnished to TCBX true and complete copies of (i) the audited consolidated balance sheets of Great

Plains and its Subsidiaries as of December 31, 2025, December 31, 2024, and December 31, 2023 and the related audited consolidated statements of income and comprehensive income, changes in stockholders’ equity, and cash flows of

Great Plains and its Subsidiaries, together with all related notes and schedules thereto, accompanied by the reports thereon of Great Plains’ independent auditors for the years ended as of such dates, and (ii) the unaudited consolidated

balance sheet of Great Plains and its Subsidiaries as of June 30, 2026, and the related consolidated statements of income and comprehensive income, changes in stockholders’ equity and cash flows of Great Plains and its Subsidiaries,

together with all related notes and schedules thereto for the six-month period ended as of such date (collectively, the financial statements listed in clause (i) and (ii), the “Great Plains

Financial Statements”). The Great Plains Financial Statements (including the related notes) complied as to form, as of their respective dates, in all material respects with applicable accounting requirements, have been prepared according

to GAAP applied on a consistent basis during the periods and at the dates involved (except as may be indicated in the notes thereto), fairly present, in all material respects, the consolidated financial condition of Great Plains and the Bank at the

dates thereof and the consolidated results of operations and cash flows for the periods then ended (subject, in the case of unaudited statements, to notes and normal year-end adjustments that were not material

in amount or effect), and the accounting records underlying the Great Plains Financial Statements accurately and fairly reflect in all material respects the transactions of Great Plains. The Great Plains Financial Statements do not contain any items

of extraordinary or nonrecurring income or any other income not earned in the ordinary course of business except as expressly specified therein. The books and records of Great Plains and its Subsidiaries have been, and are being, maintained in all

material respects in accordance with GAAP and any other applicable legal and accounting requirements and reflect only actual transactions. Since January 1, 2022, no independent registered public accounting firm of Great Plains has resigned (or

informed Great Plains that it intends to resign) or been dismissed as independent registered public accountants of Great Plains as a result of or in connection with any disagreements with Great Plains on a matter of accounting principles or

practices, financial statement disclosure or auditing scope or procedure.

(b) Great Plains has furnished TCBX with true and complete copies of the

Reports of Condition and Income as of December 31, 2023, 2024, and 2025 and June 30, 2026, together with the memoranda items and notes thereto (the “Call Reports”), for the Bank. The Call Reports fairly present, in all

material respects, the financial position of the Bank and the results of its operations at the date and for the period indicated in that Call Report in conformity with the instructions to the Call Report. The Call Reports do not contain any items of

special or nonrecurring income or any other income not earned in the ordinary course of business except as expressly specified therein. The Bank has calculated its allowance for credit losses in accordance with GAAP and regulatory accounting

principles (“RAP”) as applied to banking institutions and in accordance with all applicable rules and regulations. The allowance for credit losses account for the Bank is, and as of the Closing Date will be, adequate in all

material respects to provide for all losses, net of recoveries relating to loans previously charged off, on all outstanding loans of the Bank; provided, however, that no representation or warranty is made as to the sufficiency of collateral securing

or the collectability of such loans.

Section 3.06 Undisclosed Liabilities. Except as set forth in Great Plains

Confidential Schedule 3.06, neither Great Plains nor any of its Subsidiaries have any liability or obligation, accrued, absolute, contingent or otherwise and whether due or to

become due (including, without limitation, unfunded obligations under any employee benefit plan maintained by Great Plains or any of its Subsidiaries or liabilities for federal, state or local Taxes or assessments), that are not reflected in or

disclosed in the appropriate Great Plains Financial Statements or Call Reports, except those (a) liabilities and expenses incurred in the ordinary course of business and consistent with prudent business practices since the applicable dates of

the Great Plains Financial Statements or the Call Reports, respectively, or (b) that are not, individually or in the aggregate, material to Great Plains and its Subsidiaries, taken as a whole.

Section 3.07 Litigation.

(a) Except as set forth on Great Plains Confidential

Schedule 3.07, neither Great Plains nor any of its Subsidiaries is a party to any, and there are no pending or, to the Knowledge of Great Plains, threatened, legal, administrative, arbitral or

other proceedings, claims, actions or governmental or regulatory investigations of any nature against Great Plains or any of its Subsidiaries, nor to the Knowledge of Great Plains, is there any basis for any proceeding, claim or any action against

Great Plains or any of its Subsidiaries. Except as set forth in Great Plains Confidential Schedule 3.07, the amounts in controversy in each matter described on

Great Plains Confidential Schedule 3.07, and the costs and expenses of defense thereof (including attorneys’ fees) are fully covered by insurance, subject to the

deductible set forth on Great Plains Confidential Schedule 3.07 with respect to each matter and subject to the policy limits set forth on Great Plains

Confidential Schedule 3.07. There is no Order imposed upon Great Plains or any of its Subsidiaries or the assets or Property of Great Plains or any of its Subsidiaries that has

resulted in, or is reasonably likely to result in, a Material Adverse Change as to Great Plains or any of its Subsidiaries.

(b) No legal action, suit or proceeding or judicial, administrative or

governmental investigation is pending or, to the Knowledge of Great Plains, threatened against Great Plains or any of its Subsidiaries that questions or might question the validity of this Agreement or the agreements contemplated hereby or any

actions taken or to be taken by Great Plains or any of its Subsidiaries pursuant hereto or thereto or seeks to enjoin or otherwise restrain the transactions contemplated hereby or thereby.

Section 3.08 Consents and Approvals. Except for (a) the filing of applications, filings and notices, as applicable, with the

Federal Reserve and approval of such applications, filings and notices, (b) the filings of applications, filings and notices, as applicable, with the Federal Deposit Insurance Corporation (the “FDIC”), and approval of such

applications, filings and notices, (c) the filing of applications, filings and notices, as applicable, with the TDB or the OCC, and approval of such applications, filings and notices, (d) the filing with the SEC of (i) any filings

under applicable requirements of the Securities Act or Exchange Act, including the filing of the Joint Proxy Statement/Prospectus and (ii) the Registration Statement and declaration of effectiveness of the Registration Statement, (e) the

filing of the articles or certificates of merger with the Secretary of State of the State of Texas pursuant to the requirements of the TBOC and the Secretary of State of the State of Oklahoma pursuant to the requirements of the OGCA, and

(f) such filings and approvals as are required to be made or obtained under the securities or “Blue Sky” Laws of various states in connection with the issuance of shares of TCBX Common Stock pursuant to this Agreement and the

approval of the listing of such TCBX Common Stock on the New York Stock Exchange (the “NYSE”), no consents, Orders or approvals of or filings or registrations with any Governmental Entity are necessary in connection with

(A) the execution and delivery by Great Plains of this Agreement or (B) the consummation by Great Plains of the transactions contemplated by this Agreement. As of the date of this Agreement, Great Plains knows of no reason why all

regulatory approvals from any Governmental Entity or Regulatory Agency required for the consummation of the transactions contemplated hereby should not be obtained on a timely basis and Great Plains has no Knowledge of any fact or circumstance that

would materially delay receipt of any such required regulatory approval.

Section 3.09 Title to Assets. Great Plains

Confidential Schedule 3.09 identifies all real property, other than foreclosed Other Real Estate Owned Property (“OREO Property”), that as of the date of this

Agreement, is (a) owned by Great Plains or any of its Subsidiaries (“Owned Real Property”), or (b) leased pursuant to which Great Plains or any of its Subsidiaries is a party, either as a lessor or lessee

(“Leased Real Property”). Great Plains or any of its Subsidiaries (i) has good and marketable title to all its Owned Real Property; (ii) holds valid and enforceable leases for all its Leased Real Property;

(iii) owns all of its personal property reflected on the Call Reports and Great Plains Financial Statements; and (iv) holds valid and enforceable leases for all leased personal property used by Great Plains or any of its Subsidiaries, in

each case free and clear of all mortgages and all other Liens (other than Permitted Encumbrances), except for such minor imperfections of title, if any, as do not materially detract from the value of or interfere with the present use of the property

affected thereby, or which, individually or in the aggregate, would not have a Material Adverse Change on Great Plains.

Section 3.10 Absence of Certain Changes or Events. Except as set forth on

Great Plains Confidential Schedule 3.10, since December 31, 2025, Great Plains and each of its Subsidiaries has conducted its business only in the ordinary

course and has not:

(a) incurred any obligation or liability, absolute, accrued, contingent or otherwise, whether due or

to become due, except deposits taken and federal funds purchased and current liabilities for trade or business obligations, other than in the ordinary course of business and consistent with past practices and safe and sound banking practices;

(b) discharged or satisfied any Lien or paid any obligation or liability, whether absolute or contingent, due or to become due,

other than in the ordinary course of business and consistent with past practices and safe and sound banking practices;

(c)

increased the shares of Great Plains Stock or Bank Stock outstanding or its surplus (as calculated in accordance with the instructions to the Call Report), or declared or made any payment of dividends or other distribution to its shareholders, or

purchased, retired or redeemed, or obligated itself to purchase, retire or redeem, any of its shares of capital stock or other securities;

(d) issued, reserved for issuance, granted, sold or authorized the issuance of any shares of its capital stock or other

securities or subscriptions, phantom stock, options, warrants, calls, rights or commitments of any kind relating to the issuance thereto;

(e) acquired any capital stock or other equity securities or acquired any ownership interest in any bank, corporation,

partnership or other entity (except (i) through settlement of indebtedness, foreclosure, or the exercise of creditors’ remedies or (ii) in a fiduciary capacity, the ownership of which does not expose it to any liability from the

business, operations or liabilities of such Person);

(f) mortgaged, pledged or subjected to Lien any of its material

property, business or assets, tangible or intangible, except (i) Permitted Encumbrances, (ii) pledges of assets to secure public fund deposits, and (iii) those assets and properties disposed of for fair value since the applicable

dates of the Great Plains Financial Statements or the Call Reports;

(g) sold, transferred, leased to others or otherwise

disposed of any of its assets (except for assets disposed of for fair value) or canceled or compromised any debt or claim, or waived or released any right or claim, other than in the ordinary course of business and consistent with past business

practices and prudent banking practices;

(h) terminated, canceled or surrendered, or received any notice of or threat of

termination or cancellation of any contract, lease or other agreement or suffered any damage, destruction or loss which, individually or in the aggregate, may reasonably constitute a Material Adverse Change with respect to Great Plains;

(i) disposed of, permitted to lapse, transferred or granted any rights under, or entered into any settlement regarding the

breach or infringement of, any license or Proprietary Right or modified any existing rights with respect thereto;

(j) made any change in the rate of compensation, commission, bonus, vesting

or other direct or indirect remuneration payable, or paid or agreed or orally promised to pay any bonus, extra compensation, pension or severance or vacation pay, to or for the benefit of any of its shareholders, directors, officers, employees or

agents, or entered into any employment or consulting contract or other agreement with any director, officer or employee or adopted, amended in any material respect or terminated any pension, employee welfare, retirement, stock purchase, stock

option, stock appreciation rights, termination, severance, income protection, golden parachute, savings or profit-sharing plan (including trust agreements and insurance contracts embodying such plans), any deferred compensation, or collective

bargaining agreement, any group insurance contract or any other incentive, welfare or employee benefit plan or agreement maintained by it for the benefit of its directors, employees or former employees, except to the extent required by Law or as

contemplated by this Agreement;

(k) except for improvements or betterments relating to Properties, made any capital

expenditures or capital additions or betterments in excess of an aggregate of $50,000;

(l) instituted, had instituted

against it, settled or agreed to settle any litigation, action or proceeding before any court or governmental body relating to its property other than routine collection suits instituted by it to collect amounts owed or suits in which the amount in

controversy is less than $10,000;

(m) suffered any change, event or condition that, in any case or in the aggregate, has

caused or may result in a Material Adverse Change with respect to Great Plains;

(n) except for the transactions

contemplated by this Agreement or as otherwise permitted hereunder, entered into any transaction, or entered into, modified or amended any contract or commitment, other than in the ordinary course of business and consistent with past business

practices and prudent banking practices;

(o) entered into or given any promise, assurance or guarantee of the payment,

discharge or fulfillment of any undertaking or promise made by any Person, other than in the ordinary course of business and consistent with past business practices and prudent banking practices;

(p) sold, or disposed of, or otherwise divested itself of the ownership, possession, custody or control, of any corporate books

or records of any nature that, in accordance with sound business practice, normally are retained for a period of time after their use, creation or receipt, except at the end of the normal retention period;

(q) made any, or acquiesced with any, change in any accounting methods, principles or practices except as required by GAAP or

RAP or to the extent required by Law;

(r) sold (provided, however, that payment at maturity is not deemed a sale)

or purchased any investment securities in an aggregate amount of $500,000 or more, other than purchases of obligations of the U.S. Treasury (or any agency thereof) with a duration of four (4) years or less and an AA rating by at least one

nationally recognized ratings agency;

(s) made, renewed, extended the maturity of, or altered any of the terms of any loan

to any single borrower and his related interests in excess of the principal amount of $500,000;

(t) renewed, extended the

maturity of, or altered any of the terms of any loan classified by Great Plains as “intermediate,” “substandard,” and “problem” or other words of similar import; or

(u) entered into any agreement or made any commitment whether in writing or otherwise to take any of the types of action

described in subsections (a) through (t) above.

Section 3.11 Leases, Contracts and Agreements.

(a) Great Plains Confidential Schedule 3.11(a) sets

forth a complete listing, as of June 30, 2026, of all contracts to which Great Plains or any of its Subsidiaries is a party (collectively, the “Listed Contracts”) that:

(i) relate to real property used by Great Plains or any of its Subsidiaries in its operations (such contracts being referred to

herein as the “Leases”);

(ii) relate in any way to the assets or operations of Great Plains or any of

its Subsidiaries and involve payments to or by Great Plains or any of its Subsidiaries of $50,000 or more during the term thereof;

(iii) contain any right of first refusal or option to purchase in favor of a third party;

(iv) limits the ability of Great Plains or any of its Subsidiaries to compete in any line of business or with any Person or in

any geographic area or that upon consummation of the Merger will restrict the ability of TCBX or any of its Affiliates to engage in any line of business in which a bank holding company may lawfully engage;

(v) obligates Great Plains or its Subsidiaries (or, following the consummation of the transactions contemplated hereby, TCBX or

its Subsidiaries) to conduct business with any third party on an exclusive or preferential basis, or that grants any Person other than Great Plains or any of its Subsidiaries “most favored nation” status or similar rights;

(vi) relates to a joint venture, partnership, limited liability company agreement or other similar agreement or arrangement, or

to the formation, creation or operation, management or control of any partnership or joint venture with any third parties;

(vii) relates to indebtedness of Great Plains or any of its Subsidiaries;

(viii) provides for potential indemnification payments by Great Plains or

any of its Subsidiaries or the potential obligation of Great Plains or any of its Subsidiaries to repurchase loans;

(ix)

is material to Great Plains’ and its Subsidiaries’ balance sheets or their financial conditions or results of operations;

(x) provides any rights to investors in Great Plains, including registration, preemptive or antidilution rights or rights to

designate members of or observers to Great Plains’ or any of its Subsidiaries’ Board of Directors;

(xi) is a

data processing/technology, software programming or licensing contract;

(xii) requires a consent to, waiver of or

otherwise contains a provision relating to a “change of control,” or that would or would reasonably be expected to prevent, delay or impair the consummation of the transactions contemplated by this Agreement;

(xiii) limits the payment of dividends by the Bank or any other Subsidiary of Great Plains; or

(xiv) was otherwise not entered into in the ordinary course of business or that is material to Great Plains or any of its

Subsidiaries or its financial condition or results of operations.

(b) For the purposes of this Agreement, the term

“Listed Contracts” does not include (i) loans made by, (ii) unfunded loan commitments made by, (iii) letters of credit issued by, (iv) loan participations of, (v) Federal funds sold or purchased by,

(vi) repurchase agreements made by, (vii) bankers acceptances of, or (viii) deposit liabilities of, Great Plains or the Bank.

(c) No participations or loans have been sold that have buy back, recourse or guaranty provisions that create contingent or

direct liability to Great Plains or any of its Subsidiaries. All of the Listed Contracts are legal, valid and binding obligations of the parties to the contracts enforceable according to their terms, subject to the Bankruptcy Exception.

(d) True and correct copies of all such Listed Contracts, and all amendments thereto, have been furnished to TCBX.

(e) All rent and other payments by Great Plains and each of its Subsidiaries under the Listed Contracts are current, there are

no existing defaults by Great Plains or any of its Subsidiaries under the Listed Contracts and no termination, condition or other event has occurred that (whether with or without notice, lapse of time or the happening or occurrence of any other

event) would constitute a default thereunder.

(f) Since June 30, 2026, neither Great Plains nor any of its

Subsidiaries has entered into any contracts of the type described under Section 3.11(a)(i) – (a)(xiv).

Section 3.12 Taxes.

(a) Great Plains and each of its Subsidiaries have duly and timely filed all Tax Returns that they were required to file under

applicable Laws with the appropriate Governmental Entity. All such Tax Returns are true, correct and complete in all material respects and have been prepared in compliance with all applicable Laws. All Taxes due and payable by Great Plains and each

of its Subsidiaries (whether or not shown on any Tax Return) have been timely and properly paid. Neither Great Plains nor any of its Subsidiaries is currently the beneficiary of any extension of time within which to file any Tax Return. No written

claim has been made by a Governmental Entity in a jurisdiction where Great Plains or any of its Subsidiaries does not file a particular Tax Return or pay a particular Tax that indicates that Great Plains or its Subsidiary, as applicable, may be

required to file such Tax Return or pay such Tax. Other than Liens for Taxes not yet due and payable, there are no Liens for Taxes upon any of the assets of Great Plains or any of its Subsidiaries.

(b) Great Plains and each of its Subsidiaries have duly and timely collected or withheld and paid or remitted to the

appropriate Governmental Entity all Taxes required to have been collected or withheld and paid or remitted by it, and complied with all related information reporting, recordkeeping and backup withholding requirements of applicable Law.

(c) There is no action, suit, exam, audit, assessment, dispute, claim or other administrative or judicial proceeding concerning

any Tax or Tax Return (each, a “Tax Proceeding”) of Great Plains or any of its Subsidiaries either (i) currently ongoing or pending, (ii) claimed, threatened or raised by any Governmental Entity in writing, or

(iii) as to which Great Plains or any of its Subsidiaries has Knowledge. All Tax deficiencies asserted, or assessments made, against Great Plains or any of its Subsidiaries as a result of any Tax Proceeding have been fully paid or finally

settled.

(d) True and complete copies of the federal, state and local Tax Returns of, and any audit or examination reports

and statements or notices of deficiencies or assessment against, or agreed to by, Great Plains and/or any of its Subsidiaries for all Tax years or periods ended on or after December 31, 2022, have been furnished or made available to TCBX.

Neither Great Plains nor any of its Subsidiaries has waived any statute of limitations in respect of Taxes or agreed to any extension of time with respect to the assessment or collection of any Tax, which waiver or extension remains in effect

(excluding any extension that arose as a result of automatic extensions of time to file Tax Returns to the extent such extension was obtained in the ordinary course of business).

(e) Neither Great Plains nor any of its Subsidiaries has been a United States real property holding corporation within the

meaning of Section 897(c)(2) of the Code.

(f) Neither Great Plains nor any of its Subsidiaries is a party to or bound

by any tax allocation, indemnity or sharing agreement, other than commercial business agreements, the principal purpose of which is not the allocation or sharing of Taxes.

(g) Neither Great Plains nor any of its Subsidiaries has (i) been a member of any group filing a consolidated, affiliated,

unitary, combined or similar Tax Return that includes more than one legal entity (other than a group the common parent of which was Great Plains) nor (ii) any liability for the Taxes of any Person (other than Great Plains or any of its

Subsidiaries) under Treasury Regulation Section 1.1502-6 (or any similar or analogous provision of state, local, or non-U.S. Law), as a transferee or successor, or

otherwise by operation of Law.

(h) The unpaid Taxes of Great Plains and each of its Subsidiaries (i) did not, as of

June 30, 2026, exceed the current liability accruals for Taxes (excluding any reserves for deferred Taxes established to reflect timing differences between book and Tax income) set forth in the Great Plains Financial Statements and (ii) do

not exceed such current liability accruals for Taxes (excluding reserves for deferred Taxes established to reflect timing differences between book and Tax income) as adjusted for the passage of time through the Closing Date in accordance with the

past custom and practice of Great Plains and its Subsidiaries in filing their respective Tax Returns.

(i) Neither Great

Plains nor any of its Subsidiaries has been required to disclose on its federal income Tax Returns any position that could give rise to a substantial understatement of federal income tax within the meaning of Section 6662 of the Code.

(j) Neither Great Plains nor any of its Subsidiaries will be required to include any item of income in, or exclude any item of

deduction from, taxable income for any taxable period (or portion thereof) ending after the Closing Date as a result of any: (i) change in method of accounting or use of an improper method of accounting for a taxable period ending on or prior

to the Closing Date; (ii) “closing agreement” as described in Section 7121 of the Code (or any corresponding or similar provision of state, local or non-U.S. Law) or other Tax related

agreement with a Governmental Entity executed prior to Closing; (iii) intercompany transaction or excess loss account described in the Treasury Regulations under Section 1502 of the Code (or any corresponding or similar provision of state,

local or non-U.S. Law); (iv) installment sale or open transaction disposition made prior to the Closing; or (v) prepaid amount received or deferred revenue accrued prior to the Closing.

(k) Neither Great Plains nor any of its Subsidiaries has participated in or been a promoter of any “reportable

transaction” as such term is defined in Code Section 6707A(c)(1) and Treasury Regulation Section 1.6011-4(b).

(l) Neither Great Plains nor any of its Subsidiaries has distributed stock of another Person or had its stock distributed by

another Person, in a transaction that was purported or intended to be governed in whole or in part by Sections 355 or 361 of the Code.

(m) Neither Great Plains nor any of its Subsidiaries has claimed any Tax

credits under Section 2301 of the Coronavirus Aid, Relief, and Economic Security Act, as amended, or Section 3134 of the Code.

(n) Neither Great Plains nor any of its Subsidiaries has received or sought a private letter ruling, technical advice

memorandum or other similar agreement or advice from a Governmental Entity with respect to Taxes.

(o) Great Plains has

made a valid election to be an S corporation pursuant to Section 1362 of the Code, and valid state S corporation elections, where applicable, beginning with its first taxable year (the “Commencement Date”). Great Plains has

been a valid S corporation for all U.S. federal and state Tax purposes (where applicable) at all times since the Commencement Date and will continue to be a valid S corporation through the Closing Date. No Governmental Entity has challenged or is

challenging Great Plains’ qualification as an S corporation. Great Plains will not be liable for any Tax under Section 1374 of the Code (or any analogous provisions of state or local Law), in connection with the sale of any of its assets.

No corporation that is a “C corporation” (as defined in Section 1361(a)(2) of the Code) is a member of any “affiliated group” (as defined in Section 1504(a) of the Code) that includes Great Plains or any of its

Subsidiaries.

(p) Each Subsidiary of Great Plains has made a valid election to be a qualified subchapter S subsidiary (as

that term is defined in Section 1361(b)(3)(B) of the Code and valid state S corporation election, where applicable), and such Subsidiary has been a valid qualified subchapter S subsidiary for U.S. federal and state Tax purposes (where

applicable) at all times since organization or formation and will be a qualified subchapter S subsidiary at the time of the Closing.

(q) Neither Great Plains nor its Subsidiaries has taken or agreed to take (or failed to take or failed to agree to take) any

action and has no Knowledge of any facts or circumstances that would reasonably be expected to prevent the Integrated Mergers from qualifying as a “reorganization” within the meaning of Section 368(a) of the Code.

Section 3.13 Insurance. Great Plains Confidential

Schedule 3.13 sets forth an accurate and complete list of all policies of insurance, including fidelity and bond insurance, relating to Great Plains and each of its Subsidiaries. All such

policies (a) are valid, outstanding and enforceable according to their terms, subject to the Bankruptcy Exception, and (b) are presently in full force and effect, no notice has been received of the cancellation, or threatened or proposed

cancellation, of any such policy and there are no unpaid premiums due thereon. Neither Great Plains nor any of its Subsidiaries is in default with respect to any such policy and has not failed to give any notice or present any claim thereunder in a

due and timely fashion. Except as set forth on Great Plains Confidential Schedule 3.13, neither Great Plains nor any of its Subsidiaries have been refused any

insurance with respect to its assets or operations, nor has its insurance been limited by any insurance carrier to which Great Plains or any of its Subsidiaries have applied for any such insurance within the last two (2) years. Each property of

Great Plains and each of its Subsidiaries is insured for an amount deemed adequate by Great Plains’ management, as applicable, against risks customarily insured against. There have been no claims under any fidelity bonds of Great Plains or any

of its Subsidiaries within the last three (3) years, and Great Plains has no Knowledge of any facts that would form the basis of a claim under such bonds.

Section 3.14 No Material Adverse Change. Except as set forth on Great

Plains Confidential Schedule 3.14, there has not been any Material Adverse Change with regard to or affecting Great Plains or any of its Subsidiaries since

December 31, 2025, nor has any event or condition occurred that has resulted, or is reasonably likely to result, in a Material Adverse Change on Great Plains or any of its Subsidiaries or that could materially affect Great Plains’ or any

of its Subsidiaries’ ability to perform the transactions contemplated by this Agreement or the other agreements contemplated hereby.

Section 3.15 Proprietary Rights. Except as set forth on Great Plains Confidential

Schedule 3.15, neither Great Plains nor any of its Subsidiaries owns or requires the use of any patent, patent application, patent right, invention, process, trademark (whether registered or

unregistered), trademark application, trademark right, trade name, service name, service mark, copyright or any trade secret (“Proprietary Rights”) for its business or operations. Neither Great Plains nor any of its Subsidiaries

is infringing upon or otherwise acting adversely to, and have not infringed upon or otherwise acted adversely to, any Proprietary Right owned by any other Person or Persons. There is no claim or action by any such Person pending, or to Great

Plains’ Knowledge, threatened, with respect thereto. No third party has ever gained unauthorized access to any information technology networks controlled by and material to the operation of the business of Great Plains and its Subsidiaries.

Section 3.16 Transactions with Certain Persons and Entities. Except as set forth on Great Plains

Confidential Schedule 3.16 and excluding deposit liabilities, there are no outstanding amounts payable to or receivable from, or advances by Great Plains or any of

its Subsidiaries to, and neither Great Plains nor any of its Subsidiaries is otherwise a creditor to, any director or executive officer of Great Plains or any of its Subsidiaries nor is Great Plains or any of its Subsidiaries a debtor to any such

person other than as part of the normal and customary terms of such person’s employment or service as a director of Great Plains or any of its Subsidiaries. Except as set forth on Great Plains Confidential

Schedule 3.16, neither Great Plains nor any of its Subsidiaries uses any asset owned by any shareholder or any present or former director or officer of Great Plains or any of its Subsidiaries,

or any Affiliate thereof, in the operations (other than personal belongings of such officers and directors located in Great Plains’ or any of its Subsidiaries’ premises and not used in the operations of Great Plains or any of its

Subsidiaries), nor do any of such persons own or have the right to use real property that is adjacent to property on which Great Plains’ or any of its Subsidiaries’ facilities are located. Except as set forth on Great Plains

Confidential Schedule 3.16 or Great Plains Confidential Schedule 3.28(a), neither Great

Plains nor any of its Subsidiaries is a party to any transaction or contract with any director or executive officer of Great Plains or any of its Subsidiaries.

Section 3.17 Evidences of Indebtedness. All evidences of indebtedness and Leases included in the Call Reports and the Great Plains

Financial Statements are the legal, valid and binding obligations of the respective obligors thereof, enforceable in accordance with their respective terms, subject to the Bankruptcy Exception, and are not subject to any known or threatened

defenses, offsets or counterclaims that may be asserted against Great Plains or any of its Subsidiaries or the present holder thereof. The credit files of Great Plains and the Bank contain

all material information (excluding general, local or national industry, economic or similar conditions) known to Great Plains that is reasonably required to evaluate in accordance with generally

prevailing practices in the banking industry the collectability of the loan portfolio of Great Plains or the Bank (including loans that will be outstanding if any of them advances funds they are obligated to advance). Great Plains and the Bank have

disclosed all of the intermediate, substandard, doubtful, loss, nonperforming or problem loans of Great Plains and the Bank on the internal watch list of Great Plains or the Bank, a copy of which as of June 30, 2026, has been provided to TCBX.

Neither Great Plains nor the Bank has Knowledge of, nor has Great Plains or the Bank received notice of, any past or present conditions, events, activities, practices or incidents that may result in a violation of any Environmental Law with respect

to any real property securing any indebtedness reflected as an asset of Great Plains. With respect to any loan or other evidence of indebtedness all or a portion of which has been sold to or guaranteed by any Governmental Entity, including the Small

Business Administration, each of such loans was made in compliance and conformity with all relevant Laws such that such Governmental Entity’s guaranty of such loan is effective during the term of such loan in all material respects.

Section 3.18 Condition of Assets. All tangible assets used by Great Plains and each of its Subsidiaries are in good operating

condition, ordinary wear and tear excepted, and conform with all applicable ordinances, regulations, zoning and other Laws, whether federal, state or local. None of Great Plains’ or any of its Subsidiaries’ premises or equipment is in

need of maintenance or repairs other than ordinary routine maintenance and repairs that are not material in nature or cost.

Section 3.19 Environmental Compliance.

(a) Great Plains and each of its Subsidiaries, operations and Properties are in material compliance with all Environmental

Laws. Great Plains has no Knowledge of, nor has Great Plains or any of its Subsidiaries received notice of, any past, present, or future conditions, events, activities, practices or incidents that may interfere with or prevent the material

compliance of Great Plains or any of its Subsidiaries with all Environmental Laws.

(b) Great Plains and each of its

Subsidiaries have obtained all permits, licenses and authorizations that are required by it under all Environmental Laws, all such permits are in full force and effect, to Great Plains’ Knowledge there exists no basis for revocation or

suspension of the permits, and the permits will not be affected by the transactions contemplated herein.

Materials exist on, about or within any of the Properties, nor to the Knowledge of Great Plains has any Hazardous Materials previously existed on, under, about or within or have been used, generated, stored, or transported from any of the

Properties, except in normal quantities used in the normal course of business as office or cleaning supplies without release to the environment. The use that Great Plains and each of its Subsidiaries makes and intends to make of the Properties will

not result in the use, generation, storage, transportation or accumulation of any Hazardous Material on, in or from any of the Properties, except in normal quantities used in the normal course of business as office or cleaning supplies without

release to the environment.

(d) There is no action, suit, proceeding, investigation, or inquiry by any

Governmental Entity pending or to Great Plains’ Knowledge threatened against Great Plains, any of its Subsidiaries or, to Great Plains’ Knowledge, pending or threatened against any other Person in connection with any Property, arising in

any way under any Environmental Law. Neither Great Plains nor any of its Subsidiaries have any liability for remedial action under any Environmental Law. Neither Great Plains nor any of its Subsidiaries received any request for information by any

Governmental Entity with respect to the condition, use or operation of any of the Properties nor has Great Plains or any of its Subsidiaries received any notice of any kind from any Governmental Entity or other Person with respect to any violation

of or claimed or potential liability of any kind under any Environmental Law.

(e) No Hazardous Materials have been

disposed of on, or released to, or from, any of the Properties, and no Hazardous Materials are present in or on the soil, sediments, surface water or ground water on, under, or migrating from any of the Properties in concentrations that would give

rise to an obligation to conduct a remedial action pursuant to Environmental Laws.

(f) Except as listed on Great

Plains Confidential Schedule 3.19, none of the following exists at any property or facility owned or operated by Great Plains or any of its Subsidiaries: (i) under or above-ground storage tanks, (ii) asbestos containing material in any form or condition, (iii) materials or equipment containing polychlorinated biphenyls or urea formaldehyde, or (iv) landfills,

surface impoundments, or disposal areas.

(g) None of the properties currently owned or operated by Great Plains or any of

its Subsidiaries is encumbered by a Lien arising or imposed under any Environmental Law.

(h) The transactions contemplated

by this Agreement will not result in any liabilities for site investigation or cleanup, or require the consent of any Person, pursuant to any of the so-called

“transaction-triggered” or “responsible property transfer” Environmental Laws.

(i) Neither Great Plains nor any of its Subsidiaries has, either expressly or by operation of law, assumed or undertaken any

obligation, including any obligation for remedial action, of any other Person under any Environmental Law.

(j) Great

Plains has provided TCBX with copies of reports in its possession discussing the environmental condition of any Property and any violations of Environmental Law relating to any Property.

Section 3.20 Regulatory Compliance. All reports, records, registrations, statements, notices and other documents or information

required to be filed by Great Plains and any of its Subsidiaries with any Regulatory Agency, including, but not limited to, the Federal Reserve, the FDIC and the OCC, have been duly and timely filed and all information and data contained in such

reports, records or other documents are true, accurate, correct and complete in all material respects. Except as set forth on Great Plains Confidential

Schedule 3.20, (a) none of Great Plains or any of

its Subsidiaries is or has been within the last five (5) years subject to any commitment letter, memorandum of understanding, cease and desist order, written agreement or other formal or

informal administrative action with any such regulatory bodies, and Great Plains and each of its Subsidiaries are in full compliance with the requirements of any such commitment letter, memorandum of understanding, cease and desist order, written

agreement or other formal or informal administrative action, and (b) there are no actions or proceedings pending or threatened against Great Plains or any of its Subsidiaries by or before any such regulatory bodies or any other nation, state or

subdivision thereof, or any other entity exercising executive, legislative, judicial, regulatory or administrative functions of or pertaining to government. Except for normal examinations conducted by bank regulatory agencies in the ordinary course

of business, no Regulatory Agency has initiated any proceeding or, to Great Plains’ Knowledge, investigation into the business or operations of Great Plains or any of its Subsidiaries. There is no unresolved violation, criticism or exception

by any Regulatory Agency with respect to any report or statement relating to any examinations of Great Plains or the Bank. Great Plains is “well-capitalized” (as that term is defined in 12 C.F.R. Section 225.2(r)) and “well

managed” (as that term is defined in 12 C.F.R. Section 225.2(s)). The Bank is an “eligible depository institution” (as that term is defined in 12 C.F.R. Section 303.2(r)).

Section 3.21 Absence of Certain Business Practices. Neither Great Plains nor any of its Subsidiaries or any officer, employee or

agent of Great Plains or any of its Subsidiaries, or any other Person acting on their behalf, has, directly or indirectly, within the past seven (7) years, given or agreed to give any gift or similar benefit to any customer, supplier,

governmental employee or other Person who is or may be in a position to help or hinder the business of Great Plains or any of its Subsidiaries (or assist Great Plains or any of its Subsidiaries in connection with any actual or proposed transaction)

that (a) might subject Great Plains or any of its Subsidiaries to any damage or penalty in any civil, criminal or governmental litigation or proceeding, (b) if not given in the past, might have resulted in a Material Adverse Change with

respect to Great Plains, or (c) if not continued in the future might result in a Material Adverse Change or might subject Great Plains or any of its Subsidiaries to suit or penalty in any private or governmental litigation or proceeding.

Section 3.22 Books and Records. The minute books, stock certificate books and stock transfer ledgers of Great Plains and each of

its Subsidiaries (a) have been kept accurately in the ordinary course of business, (b) are complete and correct in all material respects, and (c) do not fail to reflect transactions involving the business of Great Plains or any of its

Subsidiaries that properly should have been set forth therein and that have not been accurately so set forth, and the transactions entered therein represent bona fide transactions.

Section 3.23 Forms of Instruments, Etc. Great Plains has made, and will make, available to TCBX copies of all standard forms of

notes, mortgages, deeds of trust and other routine documents of a like nature used on a regular and recurring basis by Great Plains and its Subsidiaries in the ordinary course of its business.

Section 3.24 Fiduciary Responsibilities. Great Plains and each of its Subsidiaries have performed in all material respects all of

its duties as a trustee, custodian, guardian or as an escrow agent in a manner that complies in all material respects with all applicable Laws, regulations, orders, agreements, instruments and common law standards.

Section 3.25 Guaranties. Except as set forth on Great Plains

Confidential Schedule 3.25, according to prudent business practices and in compliance with applicable Law, neither Great Plains nor any of its Subsidiaries have guaranteed the

obligations or liabilities of any other Person.

Section 3.26 Voting Trust, Voting Agreements or Shareholders’

Agreements. Except as set forth in Great Plains Confidential Schedule 3.26 and except for the Voting Agreements, during the periods ending on or prior to the Closing

Date, there have been no voting trusts, voting agreements, shareholders’ agreements or similar arrangements relating to a right of first refusal with respect to the purchase, sale or voting of any shares of Great Plains Stock.

Section 3.27 Employee Relationships.

(a) Great Plains has provided or made available to TCBX a true and complete list identifying all employees of Great Plains or

any of its Subsidiaries as of the date hereof and specifying with respect to each such employee, as of such date, the employee’s: (i) name or employee identification number, (ii) job title, (iii) employing entity,

(iv) primary work location, (v) date of hire, (vi) base salary or regular hourly wage rate, as applicable, (vii) classification as full-time or part-time, and (viii) classification as exempt or

non-exempt under the Fair Labor Standards Act. Great Plains has provided or made available to TCBX a true and complete list identifying all independent contractors of Great Plains or any of its Subsidiaries as

of the date hereof and specifying with respect to each such contractor, as of such date, the contractor’s: (A) length of service, (B) compensation terms, and (C) brief summary of services provided.

(b) Great Plains and each of its Subsidiaries have complied in all material respects with all applicable Laws relating to its

relationships with their employees, and Great Plains believes that the relationships between Great Plains’ and each of its Subsidiaries’ employees are good. To the Knowledge of Great Plains, no executive officer or manager of any of the

operations of Great Plains or any of its Subsidiaries or of any group of employees of Great Plains or any of its Subsidiaries have any present plans to terminate their employment with Great Plains or any of its Subsidiaries. Except as set forth on

Great Plains Confidential Schedule 3.27(b), Great Plains is not a party to any oral or written contracts or agreements granting benefits or rights to employees or any

collective bargaining agreement or to any conciliation agreement with the Department of Labor, the Equal Employment Opportunity Commission or any federal, state or local agency that requires equal employment opportunities or affirmative action in

employment. There are no unfair labor practice complaints pending against Great Plains or any of its Subsidiaries before the National Labor Relations Board and no similar claims pending before any similar state or local or foreign agency. There is

no activity or proceeding of any labor organization (or representative thereof) or employee group to organize any employees of Great Plains or any of its Subsidiaries, nor of any strikes, slowdowns, work stoppages, lockouts or threats thereof, by or

with respect to any such employees. Great Plains and each of its Subsidiaries is in compliance in all material respects with all applicable Laws respecting employment and employment practices, terms and conditions of employment and wages and hours,

and neither Great Plains nor any of its Subsidiaries is engaged in any unfair labor practice.

Schedule 3.27(c) is a complete and correct list of all employment agreements between Great Plains or any of its Subsidiaries and any employee of Great Plains or any of its Subsidiaries (collectively,

“Employment Agreements”). True and correct copies of all Employment Agreements and all amendments thereto have been furnished to TCBX.

Section 3.28 Employee Benefit Plans.

(a) Set forth on Great Plains Confidential

Schedule 3.28(a) is a complete and correct list of all “employee benefit plans” (as defined in the Employee Retirement Income Security Act of 1974, as amended

(“ERISA”)), all multiple employer and “multiemployer plans” (as defined in the Code or ERISA), all specified fringe benefit plans as defined in Code Section 6039D, and all other bonus, incentive, compensation,

deferred compensation, profit sharing, stock option, phantom stock, stock appreciation right, stock bonus, stock purchase, employee stock ownership, savings, severance, supplemental unemployment, layoff, salary continuation, retirement, pension,

health, life insurance, disability, group insurance, vacation, holiday, sick leave, fringe benefit or welfare plan or any other similar plan, agreement, policy or understanding (written or oral, qualified or nonqualified, currently effective or

terminated), and any trust, escrow or other agreement related thereto, which (i) are sponsored, maintained, or contributed to, by Great Plains or any of its Subsidiaries, or with respect to which Great Plains or any of its Subsidiaries has or

could reasonably be expected to have any liability thereunder, and (ii) provide benefits, or describe policies or procedures applicable to, or for the welfare of, any current of former officer, director, independent contractor, employee, or

service provider of Great Plains or any of its Subsidiaries, or the dependents or spouses of any such person, regardless of whether funded (the “Employee Plans”). Except as set forth on Great Plains

Confidential Schedule 3.28(a), true, accurate and complete copies of the documents comprising each Employee Plan, or, in the case of each unwritten Employee Plan, a written

description thereof, including, to the extent applicable, each award agreement, trust, funding arrangements (including all annuity contracts, insurance contracts, and other funding instruments), the most current determination or opinion letter

issued by the Internal Revenue Service, Form 5500 Annual Reports (including all schedules and attachments) for the three most recent plan years, documents, records, policies, procedures or other materials related thereto, have been made

available to TCBX and are included and specifically identified in Great Plains Confidential Schedule 3.28(a). No unwritten amendment exists with respect to any written

Employee Plan.

(b) Except as set forth on Great Plains Confidential

Schedule 3.28(b), no Employee Plan is a defined benefit plan within the meaning of ERISA Section 3(35) or is otherwise subject to ERISA Title IV, and neither Great Plains nor any of its Subsidiaries has

ever sponsored or otherwise maintained such a plan.

Confidential Schedule 3.28(c), there have been no prohibited transactions (as defined in Code Section 4975(c)(1)), breaches of fiduciary duty or any other breaches or

violations of any Law applicable to the Employee Plans that would directly or indirectly subject Great Plains, any of its Subsidiaries or any Employee Plan to any taxes, penalties, or other liabilities (including any liability arising

from any indemnification agreement or policy). Each Employee Plan that is intended to be qualified under Code Section 401(a) has a current favorable determination or opinion letter and has

no obligation to adopt any amendments for which the remedial amendment period under Code Section 401(b) has expired and Great Plains does not have Knowledge of any circumstances likely to result in revocation of any such favorable determination

or Great Plains’ ability to rely on such opinion letter. Each such Employee Plan has been operated in material compliance with applicable Law and its terms, any related trust is exempt from federal income tax under Code Section 501(a) and

no event has occurred that will or reasonably could result in the loss of such tax exemption or to liability for any tax under Code Section 511. There are no pending claims, lawsuits or actions relating to any Employee Plan (other than ordinary

course claims for benefits) and, to Great Plains’ Knowledge, none are threatened. Neither Great Plains nor any of its Subsidiaries provides benefits to any employee or dependent of such employee of Great Plains or any of its Subsidiaries after

the employee terminates employment other than as disclosed in this Agreement or any schedule hereto or as required by Law. No written or oral representations have been made by or on behalf of Great Plains or any of its Subsidiaries to any employee

or former employee of Great Plains or any of its Subsidiaries promising or guaranteeing any employer payment or funding for the continuation of medical, dental, life or disability coverage or any other welfare benefit (as defined in ERISA

Section 3(1)) for any period of time beyond the end of the current plan year (except to the extent of coverage required under Code Section 4980B). There are no surrender charges, penalties, or other costs or fees that would be imposed by

any person against Great Plains or any of its Subsidiaries, an Employee Plan, or any other person, including an Employee Plan participant or beneficiary, as a result of the hypothetical liquidation as of the Closing Date of any insurance, annuity,

or investment contracts or any other similar investment held by any Employee Plan.

(d) Except as set forth on Great

Plains Confidential Schedule 3.28(d), as required by the terms of any Employee Plan or by applicable Law, or as contemplated by this Agreement, the execution and delivery of this Agreement and the consummation of the transactions

contemplated by this Agreement will not (alone or in combination with any other event) (i) increase the compensation or benefits payable under any Employee Plan, (ii) result in any acceleration of the time of payment, vesting or funding of

any compensation or benefits payable under any Employee Plan or otherwise accelerate or increase any liability of Great Plains or any of its Subsidiaries under any Employee Plan, (iii) entitle any employee, officer, or director, or other

individual service provider of Great Plains or any of its Subsidiaries to any payment, (iv) create any limitation or restriction on the right of Great Plains or any of its Subsidiaries to merge, amend or terminate any Employee Plan, or

(v) result in the payment of any amount that could, individually or in combination with any other such payment, constitute an “excess parachute payment,” as defined in Section 280G(b)(1) of the Code.

(e) All contributions to any Employee Plan (including, without limitation, all employer contributions, employee salary

reduction contributions and all premiums or other payments (other than claims)) that are due and payable by Great Plains or any of its Subsidiaries on or before the Closing Date have been timely paid to or made with respect to each Employee Plan

and, to the extent not presently payable, appropriate reserves have been established for the payment and properly accrued in accordance with GAAP.

(f) No participant, beneficiary or

non-participating employee has been denied any benefit due or to become due under any Employee Plan. Neither Great Plains nor any of its Subsidiaries has misled any person as to his or her rights under any

Employee Plan. All obligations required to be performed by Great Plains and any of its Subsidiaries under any Employee Plan have been performed in all material respects and neither Great Plains nor any of its Subsidiaries is in default under or in

violation of any provision of any Employee Plan. To the Knowledge of Great Plains, no event has occurred that would constitute grounds for an enforcement action by any party against Great Plains, any of its Subsidiaries or any fiduciary of any

Employee Plan under part 5 of Title I of ERISA under any Employee Plan.

(g) With respect to each “employee

benefit plan” (as defined in ERISA) maintained or contributed to or required to be contributed to, currently or within the last six (6) years, by any corporation or trade or business, the employees of which, together with the employees of

Great Plains and each of its Subsidiaries, are required to be treated as employed by a single employer under any of the rules contained in ERISA or Code Section 414 (the “Controlled Group Plans”):

(i) All Controlled Group Plans that are “group health plans” (as defined in Code Section 5000(b)(1) and ERISA

Section 733(a)) have been operated up to the Closing in a manner so as to not subject Great Plains or any of its Subsidiaries to any liability under Code Section 4980B or Section 4980D; and

(ii) Except as set forth on Great Plains Confidential

Schedule 3.28(g), there is no Controlled Group Plan that is a “multiple employer plan” or “multiemployer plan” (as either such term is defined in ERISA), nor has there been any such

plan under which Great Plains or any of its Subsidiaries had any liability in the last five (5) years (or would have had liability if notice had been given).

Each such Controlled Group Plan is included in the listing of Employee Plans on Great Plains Confidential

Schedule 3.28(a).

(h) Except as set forth on Great Plains

Confidential Schedule 3.28(h), each Employee Plan that provides (or has provided within the past five (5) years) for health, dental, vision, life, disability or similar

coverage is fully covered by one or more third-party insurance policies and neither Great Plains nor any of its Subsidiaries is liable for self-insuring such claims.

(i) Except as set forth on Great Plains Confidential

Schedule 3.28(i), all Employee Plan documents, annual reports or returns, audited, compiled or unaudited financial statements, actuarial valuations, summary annual reports, and summary plan descriptions

issued with respect to the Employee Plans are correct, complete, and current in all material respects, and have been timely filed or distributed to the extent required by Law.

(j) Except as set forth on Great Plains

Confidential Schedule 3.28(j), no Employee Plan holds any stock or other securities of Great Plains or any of its Subsidiaries or provides the opportunity for the grant, purchase

or contribution of any such security.

(k) Except as provided in Great Plains

Confidential Schedule 3.28(k), Great Plains or any of its Subsidiaries may, at any time amend or terminate any Employee Plan that it sponsors or maintains and may withdraw from any

Employee Plan to which it contributes (but does not sponsor or maintain), without obtaining the consent of any third party, other than an insurance company in the case of any benefit underwritten by an insurance company, and without incurring

liability except for unpaid premiums or contributions due for the pay period that includes the effective date of such amendment, withdrawal or termination and for customary termination expenses.

(l) Each Employee Plan that is a “nonqualified deferred compensation plan” within the meaning of Code

Section 409A(d)(1) (a “Nonqualified Deferred Compensation Plan”) subject to Code Section 409A has (i) been maintained and operated since January 1, 2010 (or, if later, from its inception) in good faith

compliance with Code Section 409A of the Code and all applicable IRS regulations promulgated thereunder, and (ii) since January 1, 2011, been materially in documentary and operational compliance with Code Section 409A and

all applicable IRS guidance promulgated thereunder. No additional tax under Code Section 409A(a)(1)(B) has been or is reasonably expected to be incurred by a participant in any such Employee Plan or other contract, plan, program, agreement, or

arrangement. Neither Great Plains nor any of its Subsidiaries is a party to, or otherwise obligated under, any contract, agreement, plan or arrangement that provides for the gross-up of taxes imposed by Code

Section 409A(a)(1)(B). No currently outstanding stock option or other right to acquire Great Plains Stock or other equity security of Great Plains or any of its Subsidiaries under any Employee Plan, or the payment of cash based on the value

thereof, (A) has, as to any employee of Great Plains or any of its Subsidiaries, an exercise price that was less than the fair market value of the underlying equity security as of the date such stock option or right was granted, as determined

by Great Plains in good faith and in compliance with the relevant IRS guidance in effect on the date of grant (including, IRS Notice 2005-1 and

Section 1.409A-1(b)(5)(iv) of the Treasury Regulations), (B) has any feature for the deferral of compensation other than the deferral of recognition of income until the later of exercise or

disposition of such option or right, or (C) has been granted after December 31, 2004, with respect to any class of stock of Great Plains or any of its Subsidiaries that is not “service recipient stock” (within the meaning of

applicable regulations under Code Section 409A).

Section 3.29 Obligations to Employees. All accrued obligations and

liabilities of Great Plains, each of its Subsidiaries and all Employee Plans, for payments to trusts (including grantor trusts) or other funds, to any government agency or authority, or to any present or former director, officer, employee or agent

(or his or her heirs, legatees or legal representatives) with respect to any of the matters listed below have been timely paid to the extent required by applicable Law or the terms of such plan, contract program, policy, or other governing

instruments: (a) withholding Taxes, unemployment compensation or social security benefits; (b) all pension, profit-sharing, savings, stock purchase, stock bonus, stock ownership, stock option, phantom stock and stock appreciation rights

plans and agreements; (c) all employment, deferred compensation (whether

funded or unfunded), salary continuation, consulting, retirement, early retirement, severance, reimbursement, bonus or collective bargaining plans and agreements; (d) all executive and other

incentive compensation plans, programs, or agreements; (e) all group insurance and health contracts, policies and plans; and (f) all other incentive, welfare (including vacation and sick pay), retirement or employee benefit plans or

agreements maintained or sponsored, participated in, or contributed to, by Great Plains or any of its Subsidiaries for its current or former directors, officers, employees and agents. To the extent that payment of any obligation or liability under

any of the foregoing is not currently required, adequate actuarial accruals and reserves for such payments have been and are being made by Great Plains or its Subsidiaries according to GAAP and applicable Law applied on a consistent basis. All

obligations and liabilities of Great Plains and each of its Subsidiaries for all other forms of compensation that are or may be payable to their current or former directors, officers, employees or agents, or pursuant to any Employee Plan, have been

and are being paid to the extent required by applicable Law or by the plan or contract, and adequate actuarial accruals and reserves for payment therefor have been and are being made by Great Plains and each of its Subsidiaries according to GAAP and

generally accepted actuarial principles. All accruals and reserves referred to in this Section 3.29 are correctly and accurately reflected and accounted for in the Great Plains Financial Statements and the books, statements

and records of Great Plains and each of its Subsidiaries.

Section 3.30 Interest Rate Risk Management Instruments. Other than

loans that provide for interest rate caps or floors, neither Great Plains nor any of its Subsidiaries has any interest rate swaps, caps, floors and option agreements and other interest rate risk management arrangements, whether entered into for the

account of Great Plains or any of its Subsidiaries or for the account of a customer of Great Plains or any of its Subsidiaries.

Section 3.31 Internal Controls. Great Plains and each of its Subsidiaries maintains accurate books and records reflecting its

assets and liabilities and maintains adequate internal accounting controls that are designed to provide assurance that (a) transactions are executed with management’s authorization; (b) transactions are recorded as necessary to

permit preparation of the consolidated financial statements of Great Plains and to maintain accountability for Great Plains’ and its Subsidiaries’ assets; (c) access to Great Plains’ and its Subsidiaries’ assets is

permitted only in accordance with management’s authorization; (d) the reporting of Great Plains’ and its Subsidiaries’ assets is compared with existing assets at regular intervals; and (e) extensions of credit and other

receivables are recorded accurately, and proper and adequate procedures are implemented to effect the collection thereof on a current and timely basis. Except as set forth on Great Plains Confidential

Schedule 3.31, none of Great Plains’ or any of its Subsidiaries’ systems, controls, data or information are recorded, stored, maintained, operated or otherwise wholly or partly dependent on or held by any means

(including any electronic, mechanical or photographic process, whether computerized or not) which (including all means of access thereto and therefrom) are not under the exclusive ownership and direct control of Great Plains, any of its Subsidiaries

or their accountants.

Section 3.32 Community Reinvestment Act. The Bank is in compliance with the Community Reinvestment Act

(the “CRA”) and all regulations issued thereunder, and Great Plains has supplied TCBX with copies of the Bank’s current CRA Statement, all support papers therefor, all letters and written comments received by it since

October 27, 2024, pertaining thereto and any responses by the Bank to those letters and comments. The Bank has a rating of not less than “satisfactory” as of its most recent CRA compliance examination and Great Plains has no

Knowledge of any reason why the Bank would not receive a rating of “satisfactory” or better in its next CRA compliance examination or why the OCC or any other Governmental Entity may seek to restrain, delay or prohibit the transactions

contemplated hereby as a result of any act or omission of the Bank under the CRA.

Section 3.33 Fair Housing Act, Home Mortgage Disclosure Act, Real Estate Settlement

Procedures Act and Equal Credit Opportunity Act. The Bank is in compliance with the Fair Housing Act, the Home Mortgage Disclosure Act, the Real Estate Settlement Procedures Act and the Equal Credit Opportunity Act and all regulations issued

thereunder. The Bank has not received any notice of any violation of those acts or any of the regulations issued thereunder, and the Bank has not received any notice of, nor does Great Plains have any Knowledge of, any threatened administrative

inquiry, proceeding or investigation with respect to the Bank’s non-compliance with such acts.

Section 3.34 Usury Laws and Other Consumer Compliance Laws. All loans of the Bank have been made in accordance with all applicable

statutes and regulatory requirements at the time of such loan or any renewal thereof, including without limitation, the Oklahoma usury statutes as they are currently interpreted, Regulation Z issued by the Federal Reserve, the Federal Consumer

Credit Protection Act and all statutes and regulations governing the operation of banks chartered under the Laws of the United States. Each loan on the books of the Bank was made in the ordinary course of business.

Section 3.35 Bank Secrecy Act, Foreign Corrupt Practices Act and U.S.A. Patriot Act. Great Plains and the Bank are in compliance

with the Bank Secrecy Act, the United States Foreign Corrupt Practices Act and the International Money Laundering Abatement and Anti-Terrorist Financing Act, otherwise known as the U.S.A. Patriot Act, and all regulations issued thereunder, and the

Bank has properly certified all foreign deposit accounts and has made all necessary Tax withholdings on all of its deposit accounts; furthermore, the Bank has timely and properly filed and maintained all requisite Currency Transaction Reports and

other related forms, including any requisite Custom Reports required by any agency of the United States Treasury Department, including the IRS. The Bank has timely filed all Suspicious Activity Reports with the Financial Institutions - Financial

Crimes Enforcement Network (U.S. Department of the Treasury) required to be filed by it under the Laws referenced in this Section 3.35.

Section 3.36 Unfair, Deceptive or Abusive Acts or Practices. Neither Great Plains nor any of its Subsidiaries has engaged in any

unfair, deceptive or abusive acts or practices, as such terms are defined under Section 1031 of the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”). There are no allegations, claims or

disputes to which Great Plains or any of its Subsidiaries is a party that allege, or to the Knowledge of Great Plains, no Person has threatened to allege, that Great Plains or any of its Subsidiaries has engaged in any unfair, deceptive or abusive

acts or practices.

Section 3.37 Securities Not Publicly Traded. No security or interest in Great

Plains or any of its Subsidiaries is, or has been, publicly traded, quoted or traded on any security exchange, over-the-counter market or any interdealer quotation

system including, without limitation, the NYSE, The NASDAQ Stock Market LLC, the American Stock Exchange, Inc. or the Over-the-Counter Bulletin Board. Neither Great Plains nor any of its Subsidiaries has ever

filed a registration statement with the Securities and Exchange Commission (“SEC”) under the Securities Act or been required to file, or has voluntarily filed, periodic reports with the SEC pursuant to Section 13 or 15(d) of

the Exchange Act. Neither Great Plains nor any of its Subsidiaries has obtained a CUSIP number for any of its securities. The consummation of the transactions contemplated hereby will not require any notification or filing pursuant to Rule 10b-17 promulgated by the SEC or Rule 6490 promulgated by the Financial Industry Regulatory Authority.

Section 3.38 Joint Proxy Statement/Prospectus. None of the information supplied or to be supplied by Great Plains or any of its

Subsidiaries or any of its directors, officers, employees or agents for inclusion in the Joint Proxy Statement/Prospectus shall, at the date the Joint Proxy Statement/Prospectus is mailed to the shareholders of Great Plains and TCBX and, as the

Joint Proxy Statement/Prospectus may be amended or supplemented, at the time of the Great Plains Shareholders’ Meeting and the TCBX Shareholders’ Meeting, contain any untrue statement of a material fact or omit to state any material fact

with respect to Great Plains or any of its Subsidiaries necessary in order to make the statements therein with respect to Great Plains and any of its Subsidiaries, in light of the circumstances under which they are made, not misleading or necessary

to correct any statement in any earlier communication with respect to the solicitation of any proxy for the Great Plains Shareholders’ Meeting or the TCBX Shareholders’ Meeting. All documents that Great Plains is responsible for filing

with any Regulatory Agency in connection with the Merger shall comply with respect to Great Plains and each of its Subsidiaries with the provisions of applicable Law.

Section 3.39 Agreements Between Great Plains and its Subsidiaries; Claims. Except as set forth on Great Plains

Confidential Schedule 3.39, there are no written or oral agreements or understandings between Great Plains and any of its Subsidiaries. All past courses of dealings

between Great Plains and each of its Subsidiaries have been conducted in the ordinary course of business, on arms-length terms consistent with applicable Law and prudent business practices. Great Plains has no Knowledge of any Claims that Great

Plains has against any of its Subsidiaries or of any facts or circumstances that would give rise to any such Claim.

Section 3.40

Representations Not Misleading. No representation or warranty by Great Plains contained in this Agreement, nor any written statement, exhibit or schedule furnished to TCBX by Great Plains under and pursuant to, or in anticipation of this

Agreement, contains or will contain on the Closing Date any untrue statement of a material fact or omits or will omit to state a material fact necessary to make the statements contained herein or therein, in light of the circumstances under which it

was or will be made, not misleading and such representations and warranties would continue to be true and correct following disclosure to any Governmental Entity having jurisdiction over Great Plains or its properties of the facts and circumstances

upon which they were based.

Section 3.41 State Takeover Laws. The Great Plains Board has approved this Agreement and the

transactions contemplated hereby as required to render inapplicable to such agreements and transactions any applicable provisions of the takeover Laws of any state, including any “moratorium,” “control share,” “fair

price,” “takeover” or “interested shareholder” Law.

Section 3.42 Opinion of Financial Advisor. Prior to the execution of this

Agreement, the Great Plains Board has received an opinion (which, if initially rendered orally, has been or will be confirmed by a written opinion, dated the same date) from Stephens Inc., to the effect that, as of the date thereof, and based upon

and subject to the factors, assumptions and limitations set forth therein, the Merger Consideration pursuant to this Agreement is fair, from a financial point of view, to the holders of Great Plains Stock. Such opinion has not been amended or

rescinded in any material respect as of the date of this Agreement.

Section 3.43 No Other Representations or Warranties.

Except as expressly set forth in this Agreement, none of Great Plains, its Subsidiaries or any other Person is making or has made, and none of them shall have liability in respect of, any written or oral representation or warranty, express or

implied, at Law, in equity or otherwise, with respect to Great Plains or any of its Subsidiaries or otherwise, and whether express or implied, at Law, in equity or otherwise, in respect of this Agreement or the transactions contemplated thereby, or

in respect of any other matter whatsoever.

ARTICLE IV

REPRESENTATIONS AND WARRANTIES OF TCBX

Except (i) as disclosed in the disclosure schedules delivered by TCBX to Great Plains prior to the execution hereof (the “TCBX

incorrect, (b) the mere inclusion of an item in the TCBX Confidential Schedules as an exception to a representation or warranty shall not be deemed an admission by TCBX that such item represents a material exception or fact, event or

circumstance or that such item is reasonably likely to result in a Material Adverse Change with respect to TCBX, and (c) any disclosures made with respect to a section of this ARTICLE IV shall be deemed to qualify

(1) any other section of this ARTICLE IV specifically referenced or cross-referenced and (2) other sections of this ARTICLE IV to the extent it is reasonably apparent on its face

(notwithstanding the absence of a specific cross reference) from a reading of the disclosure that such disclosure applies to such other sections or (ii) as disclosed in any TCBX SEC Reports filed prior to the date hereof (but disregarding risk

factor disclosures contained under the heading “Risk Factors,” or disclosures of risks set forth in any “forward-looking statements” disclaimer or any other statements that are similarly

non-specific or cautionary, predictive or forward-looking in nature), TCBX hereby represents and warrants to Great Plains as follows:

Section 4.01 Organization and Qualification.

(a) TCBX is a corporation, duly organized, validly existing and in good standing under all Laws of the State of Texas and is a

bank holding company registered under the BHCA. TCBX has the corporate power and authority (including all licenses, franchises, permits and other governmental authorizations as are legally required) to carry on its business as now being conducted,

to own, lease and operate its properties and assets as now owned, leased or operated and to enter into and carry out its obligations under this Agreement. True and complete copies of the certificate of formation and bylaws of TCBX, as amended to

date, certified by the Secretary of TCBX, have been made available to Great Plains.

(b) TCB is a Texas banking association, duly organized and validly existing

under the Laws of the State of Texas and in good standing under all Laws of the State of Texas. TCB has the corporate power and authority (including all licenses, franchises, permits and other governmental authorizations as are legally required) to

carry on its business as now being conducted, to own, lease and operate its properties and assets as now owned, leased or operated and to enter into and to carry on the business and activities now conducted by it. True and complete copies of the

certificate of formation and bylaws of TCB, as amended to date, certified by the Secretary or Cashier of TCB have been made available to Great Plains. TCB is an insured depository institution as defined in the FDIA.

(c) Merger Sub is a corporation, duly organized, validly existing and in good standing under all Laws of the State of Oklahoma

and is wholly owned by TCBX. Merger Sub has the corporate power and authority (including all licenses, franchises, permits and other governmental authorizations as are legally required) to carry on its business as now being conducted, to own, lease

and operate its properties and assets as now owned, leased or operated and to enter into and carry out its obligations under this Agreement. True and complete copies of the certificate of incorporation and bylaws of Merger Sub, as amended to date,

have been made available to Great Plains.

Section 4.02 Authority; Execution and Delivery.

(a) TCBX has the full corporate power and authority to execute and deliver this Agreement and to consummate the transactions

contemplated herein. The execution and delivery of this Agreement and the consummation of the Merger have been duly and validly approved by the TCBX Board. The TCBX Board has determined that the Merger, on the terms and conditions set forth in this

Agreement, is in the best interests of TCBX and its shareholders and has directed that the TCBX Share Issuance be submitted to TCBX’s shareholders for approval at a meeting of such shareholders with a recommendation from the TCBX Board in

favor of approval and has adopted a resolution to the foregoing effect. TCBX has taken all action necessary to authorize the execution, delivery and (provided the required regulatory and shareholder approvals are obtained) performance of this

Agreement and the other agreements and documents contemplated hereby to which it is a party. This Agreement has been, and the other agreements and documents contemplated hereby, have been or at Closing will be, duly executed by TCBX, and each

constitutes the legal, valid and binding obligation of TCBX, enforceable in accordance with its respective terms and conditions, except as enforceability may be limited by the Bankruptcy Exception.

(b) Merger Sub has the full corporate power and authority to execute and deliver this Agreement and to consummate the

transactions contemplated herein. Merger Sub has taken all action necessary to authorize the execution, delivery and (provided the required regulatory and shareholder approvals are obtained) performance of this Agreement and the other agreements and

documents contemplated hereby to which it is a party. This Agreement has been, and the other agreements and documents contemplated hereby, have been or at Closing will be, duly executed by Merger Sub, and each constitutes the legal, valid and

binding obligation of Merger Sub, enforceable in accordance with its respective terms and conditions, except as enforceability may be limited by the Bankruptcy Exception.

Section 4.03 Capitalization.

(a) The entire authorized capital stock of TCBX consists solely of (i) 50,000,000 shares of TCBX Common Stock, of which

(A) 16,639,127 shares were issued and outstanding as of June 30, 2026, and (B) 78,462 shares were held as treasury stock as of June 30, 2026, (ii) 3,500,000 shares of TCBX Non-Voting Common

Stock, of which no shares were issued and outstanding as of June 30, 2026, and (iii) 1,000,000 shares of preferred stock, par value $1.00 per share, of which 69,400 shares are designated as Series A Preferred Stock and 69,400 shares

are designated as Series B Preferred Stock, and of which 69,400 shares of Series A Preferred Stock and no shares of Series B Preferred Stock were issued and outstanding as of June 30, 2026.

(b) At the Effective Time, the shares of TCBX Common Stock issued pursuant to the Merger will be duly authorized, validly

issued, fully paid and nonassessable, will not be issued in violation of any preemptive rights or any applicable federal or state securities Laws, and will not be subject to any restrictions on transfer arising under the Securities Act, except for

shares issued to any shareholder of Great Plains who may be deemed to be an “affiliate” (under the Exchange Act) of TCBX after completion of the Merger.

Section 4.04 SEC Filings; Financial Statements.

(a) TCBX has timely filed and made available to Great Plains all forms, reports, and documents required to be filed by TCBX

with the SEC since December 31, 2023 (collectively, the “TCBX SEC Reports”). The TCBX SEC Reports (i) at the time filed, complied in all material respects with the applicable requirements of the Securities Act and the

Exchange Act, as the case may be, and (ii) did not at the time they were filed (or if amended or superseded by a filing prior to the date of this Agreement, then on the date of such filing) contain any untrue statement of a material fact or

omit to state a material fact required to be stated in such TCBX SEC Reports or necessary in order to make the statements in such TCBX SEC Reports, in light of the circumstances under which they were made, not misleading. Except for any Subsidiaries

of TCBX that are registered as a broker, dealer or investment advisor or filings required due to fiduciary holdings of such Subsidiaries of TCBX, no Subsidiary of TCBX is required to file any forms, reports or other documents with the SEC.

(b) The financial statements of TCBX contained in the TCBX SEC Reports, including any TCBX SEC Reports filed after the date of

this Agreement until the Effective Time, complied or will comply as to form in all material respects with the applicable published rules and regulations of the SEC with respect thereto, was or will be prepared in accordance with GAAP applied on a

consistent basis throughout the periods involved (except as may be indicated in the notes to such financial statements or, in the case of unaudited statements, as permitted by Form 10-Q of the SEC), and

fairly presented or will fairly present the consolidated financial position of TCBX and its Subsidiaries as at the respective dates and the consolidated results of its operations and cash flows for the periods indicated, except that the unaudited

interim financial statements were or are subject to normal and recurring year-end adjustments which were not or are not expected to be material in amount or effect.

defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act) are designed to ensure that all material information (both financial and non-financial) required to be disclosed by TCBX in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the rules and forms

of the SEC, and that all such information is accumulated and communicated to TCBX’s management as appropriate to allow timely decisions regarding required disclosure and to make the certifications of the Chief Executive Officer and Chief

Financial Officer of TCBX required under the Exchange Act with respect to such reports. TCBX has disclosed, based on its most recent evaluation of such disclosure controls and procedures prior to the date of this Agreement, to TCBX’s auditors

and the audit committee of the TCBX Board (i) any significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting that could adversely affect in any material respect TCBX’s ability

to record, process, summarize and report financial information and (ii) any fraud, whether or not material, that involves management or other employees who have a significant role in TCBX’s internal controls over financial reporting.

(d) Each of the principal executive officer and the principal financial officer of TCBX (or each former principal executive

officer and each former principal financial officer of TCBX, as applicable) has made all certifications required by Rule 13a-14 or 15d-14 under the Exchange Act and

Sections 302 and 906 of the SOA with respect to the TCBX SEC Reports, and the statements contained in such certifications are true and accurate in all material respects. Neither TCBX nor any of its Subsidiaries has outstanding (nor has arranged

or modified since the enactment of the SOA) any “extensions of credit” (within the meaning of Section 402 of the SOA) to directors or executive officers (as defined in Rule 3b-7 under the

Exchange Act) of TCBX or any of its Subsidiaries. TCBX is otherwise in compliance, in all material respects, with all applicable provisions of the SOA.

(e) The books and records kept by TCBX and its Subsidiaries are in all material respects complete and accurate and have been

maintained in the ordinary course of business and in accordance with applicable Law and accounting requirements. The financial statements of TCBX included in the TCBX SEC Reports have been prepared from, and are in accordance with, the books and

records of TCBX and its Subsidiaries.

Section 4.05 Compliance with Laws, Permits and Instruments.

(a) Except as set forth on TCBX Confidential Schedule 4.05, each

of TCBX and TCB holds all material licenses, registrations, franchises, permits and authorizations necessary for the lawful conduct of its business and is not in violation of any applicable Law or Order of any Governmental Entity, which is

reasonably likely to result in a Material Adverse Change as to TCBX, individually or in the aggregate, or to the Knowledge of TCBX is reasonably likely to materially and adversely affect, prevent or delay the obtaining of any regulatory approval for

the consummation of the transactions contemplated by this Agreement.

(b) Except as set forth on TCBX Confidential

Schedule 4.05, each of TCBX and TCB has in all material respects performed and abided by all obligations required to be performed by it to the date hereof, and has complied with, and is in

compliance with, and is not in default (or with the giving of notice or the passage of time shall be in default) under, or in violation of, (i) any provision of the certificate of formation or bylaws of TCBX or TCB or other governing documents

of TCBX or TCB, as applicable (collectively, the “TCBX Constituent Documents”), (ii) any material provision of any mortgage, indenture, lease, contract, agreement or other instrument applicable to TCBX or any Subsidiary of

TCBX, or their respective assets, operations, properties or businesses now conducted or heretofore conducted or (iii) any permit, concession, grant, franchise, license, authorization, judgment, writ, injunction, order, decree or award of any

Governmental Entity applicable in any material respect to TCBX or any Subsidiary of TCBX or their respective assets, operations, properties or businesses now conducted or heretofore conducted.

execution, delivery and (provided the required regulatory and shareholder approvals are obtained) performance of this Agreement and the other agreements contemplated hereby, and the completion of the transactions contemplated hereby and thereby will

not conflict with, or result, by itself or with the giving of notice or the passage of time, in any violation of or default or loss of a benefit under, (i) the TCBX Constituent Documents, (ii) any material mortgage, indenture, lease,

contract, agreement or other instrument applicable to TCBX or any Subsidiary of TCBX, or their respective assets, operations, properties or businesses or (iii) any material permit, concession, grant, franchise, license, authorization, judgment,

writ, injunction, order, decree, statute, Law, ordinance, rule or regulation applicable to TCBX or any Subsidiary of TCBX or their respective assets, operations, properties or businesses.

Section 4.06 Undisclosed Liabilities. TCBX has no liability or obligation, accrued, absolute, contingent or otherwise and whether

due or to become due (including, without limitation, unfunded obligations under any employee benefit plan maintained by TCBX or liabilities for federal, state or local Taxes or assessments) that are not reflected in or disclosed in the TCBX SEC

Reports, except (a) those liabilities and expenses incurred in the ordinary course of business and consistent with past business practices since the date of the TCBX SEC Reports or (b) that are not, individually or in the aggregate,

material to TCBX.

Section 4.07 Litigation.

(a) Except as set forth on TCBX Confidential Schedule 4.07,

neither TCBX nor TCB is a party to any, and there are no pending or, to the Knowledge of TCBX, threatened, legal, administrative, arbitral or other proceedings, claims, actions or governmental or regulatory investigations of any nature against TCBX

or TCB which are reasonably likely,

individually or in the aggregate, to result in a Material Adverse Change as to TCBX or TCB, nor, to the Knowledge of TCBX, is there any basis for any proceeding, claim or any action against TCBX

or TCB that would be reasonably likely, individually or in the aggregate, to result in a Material Adverse Change as to TCBX or TCB. There is no Order imposed upon TCBX or TCB or the assets or property of TCBX or TCB that has resulted in, or is

reasonably likely to result in, a Material Adverse Change as to TCBX or TCB.

(b) No legal action, suit or proceeding or

judicial, administrative or governmental investigation is pending or, to the Knowledge of TCBX, threatened against TCBX or TCB that questions or might question the validity of this Agreement or the agreements contemplated hereby or any actions taken

or to be taken by TCBX pursuant hereto or thereto or seeks to enjoin or otherwise restrain the transactions contemplated hereby or thereby.

Section 4.08 Consents and Approvals. Except for (a) the filing of applications, filings and notices, as applicable, with the

NYSE, (b) the filing of applications, filings and notices, as applicable, with the Federal Reserve under the BHCA and approval of such applications, filings and notices, (c) the filings of applications, filings and notices, as applicable,

with the FDIC, and approval of such applications, filings and notices, (d) the filing of applications, filings and notices, as applicable, with the TDB or OCC in connection with the Bank Merger, and approval of such applications, filings and

notices, (e) the filing with the SEC of (i) any filings under applicable requirements of the Exchange Act, including the filing of the Joint Proxy Statement/Prospectus and (ii) the Registration Statement and declaration of

effectiveness of the Registration Statement, (f) the filing of the articles or certificates of merger with the Secretary of State of the State of Texas pursuant to the requirements of the TBOC and the Secretary of State of the State of Oklahoma

pursuant to the requirements of the OGCA, and (g) such filings and approvals as are required to be made or obtained under the securities or “Blue Sky” Laws of various states in connection with the issuance of shares of TCBX Common

Stock pursuant to this Agreement and the approval of the listing of such TCBX Common Stock on the NYSE, no consents, Orders or approvals of or filings or registrations with any Governmental Entity are necessary in connection with (A) the

execution and delivery by TCBX of this Agreement or (B) the consummation by TCBX of the transactions contemplated by this Agreement. As of the date of this Agreement, TCBX knows of no reason why all regulatory approvals from any Governmental

Entity or Regulatory Agency required for the consummation of the transactions contemplated hereby should not be obtained on a timely basis and TCBX has no Knowledge of any fact or circumstance that would materially delay receipt of any such required

regulatory approval.

Section 4.09 Regulatory Compliance.

(a) Except as set forth on TCBX Confidential Schedule 4.09, TCBX

is not subject to any cease-and-desist or other order or enforcement action issued by, or is a party to any written agreement, consent agreement or memorandum of

understanding with, or is a party to any commitment letter or similar undertaking to, or is subject to any order or directive by, or has been ordered to pay any civil penalty by, or is a recipient of a supervisory letter from, or has adopted any

board resolutions at the request or suggestion of any Regulatory Agency or other Governmental Entity that restricts the conduct of its business or that relates to its capital adequacy, its ability to pay dividends, its credit or risk

management policies, its management or its business. Except as set forth on TCBX Confidential Schedule 4.09, there is no unresolved

violation, criticism or exception by any Regulatory Agency or other Governmental Entity with respect to any report or statement relating to any examinations of TCBX or TCB. TCBX is “well-capitalized” (as that term is defined in 12 C.F.R.

Section 225.2(r)) and “well managed” (as that term is defined is 12 C.F.R. Section 225.2(s)). TCB is an “eligible depository institution” (as that term is defined in 12 C.F.R. Section 303.2(r)). Notwithstanding

the foregoing, neither party shall be required to take any action under this Agreement that would cause such party to violate 12 C.F.R. Section 309.6.

(b) All material reports, records, registrations, statements, notices and other documents or information required to be filed

by TCBX with any Regulatory Agency, have been duly and timely filed and all information and data contained in such reports, records or other documents are substantially true, accurate, correct and complete.

Section 4.10 Joint Proxy Statement/Prospectus. None of the information supplied or to be supplied by TCBX or any of its

Joint Proxy Statement/Prospectus may be amended or supplemented, at the time of the TCBX Shareholders’ Meeting and the Great Plains Shareholders’ Meeting, contain any untrue statement of a material fact or omit to state any material fact

with respect to TCBX or any of its Subsidiaries necessary in order to make the statements therein with respect to TCBX and any of its Subsidiaries, in light of the circumstances under which they are made, not misleading or necessary to correct any

statement in any earlier communication with respect to the solicitation of any proxy for the TCBX Shareholders’ Meeting or the Great Plains Shareholders’ Meeting. All documents that TCBX is responsible for filing with any Regulatory

Agency in connection with the Merger shall comply with respect to TCBX and each of its Subsidiaries with the provisions of applicable Law.

Section 4.11 Absence of Certain Changes. Since December 31, 2025, (a) TCBX has conducted its business in the ordinary

course (excluding the incurrence of expenses related to this Agreement and the transactions contemplated hereby), and (b) no event has occurred or circumstance arisen that, individually or in the aggregate, had or is reasonably likely to have,

a Material Adverse Change on TCBX or TCB.

Section 4.12 TCBX Disclosure Controls and Procedures. Except as set forth on

TCBX Confidential Schedule 4.12, none of TCBX’s or TCB’s records, systems, controls, data or information, are recorded, stored, maintained and operated wholly or partly

dependent on or held by any means (including any electronic, mechanical or photographic process, whether computerized or not) which (including all means of access thereto and therefrom) are not under the exclusive ownership and direct control of

TCBX, any of its Subsidiaries or their accountants.

Section 4.13 Representations Not Misleading. No representation or

warranty by TCBX contained in this Agreement, nor any written statement, exhibit or schedule furnished to Great Plains by TCBX under and pursuant to, or in anticipation of this Agreement, contains or will contain on the Closing Date any untrue

statement of a material fact or omits or will omit to state a material fact necessary to make the statements contained herein or therein, in light of the circumstances under which it was or will be made, not misleading and such representations and

warranties would continue to be true and correct following disclosure to any Governmental Entity having jurisdiction over TCBX or their properties of the facts and circumstances upon which they were based.

Section 4.14 Opinion of Financial Advisor. Prior to the execution of this

Agreement, the TCBX Board has received an opinion (which, if initially rendered orally, has been or will be confirmed by a written opinion, dated the same date) of Keefe, Bruyette & Woods, Inc. to the effect that as of the date thereof and

based upon and subject to the factors, assumptions, and limitations set forth therein, the Merger Consideration payable pursuant to this Agreement is fair from a financial point of view to TCBX. Such opinion has not been amended or rescinded in any

material respect as of the date of this Agreement.

Section 4.15 Taxes.

(a) TCBX has no Knowledge of any facts or circumstances that would reasonably be expected to prevent the Integrated Mergers

from qualifying as a “reorganization” within the meaning of Section 368(a) of the Code.

(b) TCBX and each

of its Subsidiaries have duly and timely filed all Tax Returns that they were required to file under applicable Laws with the appropriate Governmental Entity. All such Tax Returns are true, correct and complete in all material respects and have been

prepared in all material respects in compliance with all applicable Laws. All Taxes due and payable by TCBX and each of its Subsidiaries (whether or not shown on any Tax Return) have been timely and properly paid to the appropriate Governmental

Entity.

or any of its Subsidiaries either (i) currently pending or ongoing, (ii) claimed or raised by any Governmental Entity in writing, or (iii) as to which TCBX or any of its Subsidiaries has Knowledge. All Tax deficiencies asserted, or

assessments made, against TCBX or any of its Subsidiaries have been fully paid or finally resolved.

Section 4.16 No Other

Representations or Warranties. Except as expressly set forth in this Agreement, none of TCBX, its Subsidiaries or any other Person is making or has made, and none of them shall have liability in respect of, any written or oral representation or

warranty, express or implied, at Law, in equity or otherwise, with respect to TCBX or any of its Subsidiaries or otherwise, and whether express or implied, at Law, in equity or otherwise, in respect of this Agreement or the transactions contemplated

thereby, or in respect of any other matter whatsoever.

ARTICLE V

COVENANTS OF GREAT PLAINS

Section 5.01 Commercially Reasonable Efforts. Great Plains will use commercially reasonable efforts to perform and fulfill all

conditions and obligations on its part to be performed or fulfilled under this Agreement and to cause the completion of the transactions contemplated hereby in accordance with this Agreement.

Section 5.02 Great Plains Shareholders’ Meeting. Great Plains, acting through the Great Plains Board, shall,

in accordance with applicable Law (subject to a Change in Recommendation in accordance with Section 5.22, provided that Great Plains is not in breach of Section 5.22):

(a) duly call, give notice of, convene and hold a meeting of its shareholders (the “Great Plains

Shareholders’ Meeting”) as soon as practicable after the Registration Statement and the Joint Proxy Statement/Prospectus (forming a part of the Registration Statement) become effective with the SEC for the purpose of

approving and adopting this Agreement, the Merger and the transactions contemplated hereby;

(b) require no greater than

the minimum vote of the capital stock of Great Plains required by applicable Law and the Great Plains Constituent Documents in order to approve this Agreement, the Merger and the transactions contemplated hereby;

(c) include in the Joint Proxy Statement/Prospectus the recommendation of the Great Plains Board that the shareholders of Great

Plains vote in favor of the approval and adoption of this Agreement, the Merger and the transactions contemplated hereby; and

(d) cause the Joint Proxy Statement/Prospectus to be mailed to the shareholders of Great Plains as soon as practicable after

the Registration Statement and the Joint Proxy Statement/Prospectus (forming a part of the Registration Statement) become effective with the SEC, and use its commercially reasonable efforts to obtain the approval and adoption of this Agreement, the

Merger and the transactions contemplated hereby by shareholders holding at least the minimum number of shares of Great Plains Stock entitled to vote at the Great Plains Shareholders’ Meeting necessary to approve the foregoing under applicable

Law. The letters to shareholders, notices of meeting, joint proxy statement of Great Plains and TCBX and forms of proxy to be distributed to Great Plains’ and TCBX’s shareholders in connection with the Merger and this Agreement shall be

in form and substance reasonably satisfactory to TCBX and are collectively referred to herein as the “Joint Proxy Statement/Prospectus”.

Section 5.03 Information Furnished by Great Plains. Great Plains shall promptly, following receipt of a written request from TCBX,

furnish or cause to be furnished to TCBX, all information concerning Great Plains, including but not limited to financial statements, required for inclusion in any statement or application made or filed by TCBX to any Governmental Entity in

connection with the transactions contemplated by this Agreement or in connection with any unrelated transactions during the pendency of this Agreement. Great Plains represents and warrants that all information so furnished shall be true and correct

in all material respects and shall not omit any material fact required to be stated therein or necessary to make the statements made, in light of the circumstances under which they were made, not misleading. Great Plains shall otherwise reasonably

cooperate with TCBX in the filing of any applications or other documents necessary to consummate the transactions contemplated by this Agreement.

Section 5.04 Required Acts. Between the date of this Agreement and the Closing,

Great Plains will, and will cause each of its Subsidiaries including the Bank to, unless otherwise permitted in writing by TCBX:

(a) operate (including, without limitation, the making of, or agreeing to make, any loans or other extensions of credit) only

in the ordinary course of business and consistent with past practices and safe and sound banking principles;

(b) except as

required by prudent business practices, use all commercially reasonable efforts to preserve its business organization intact and to retain its present directors, officers, employees, key personnel and customers, depositors and goodwill and to

maintain all assets owned, leased or used by it (whether under its control or the control of others), in good operating condition and repair, ordinary wear and tear excepted;

(c) perform all of its obligations under any material contracts, leases and documents relating to or affecting its assets,

properties and business, except such obligations as Great Plains or any of its Subsidiaries may in good faith reasonably dispute;

(d) use commercially reasonable efforts to maintain in full force and effect all insurance policies now in effect or renewals

thereof and give all notices and present all claims under all insurance policies in due and timely fashion;

(e) timely

file, subject to extensions, all reports required to be filed with any Governmental Entity and observe and conform, in all material respects, to all applicable Laws, except those being contested in good faith by appropriate proceedings;

(f) timely file all Tax Returns required to be filed by it and timely pay all Taxes that are required to be paid by it;

(g) promptly notify TCBX of the commencement or progress of any Tax Proceeding or claim pending or threatened in writing

against or with respect to Great Plains or any of its Subsidiaries;

(h) collect or withhold all Taxes required to be

collected or withheld by it and timely pay the same in full to the proper Governmental Entity when due, and comply with all related information reporting and recordkeeping requirements;

(i) account for all transactions and prepare all financial statements in accordance with GAAP (unless otherwise instructed by

RAP in which instance account for such transaction in accordance with RAP);

(j) promptly classify and charge off loans and

make appropriate adjustments to loss reserves in accordance with the instructions to the Call Report and the Uniform Retail Credit Classification and Account Management Policy;

(k) maintain the allowance for credit losses account in an amount not less than $19,800,000;

(l) pay or accrue all costs, expenses and other charges to be incurred in

connection with the Merger, including, but not limited to, all legal fees, accounting fees, consulting fees and brokerage fees, prior to the Calculation Time; and

(m) ensure that all accruals for Taxes are accounted for in the ordinary course of business, consistent with past practices and

in accordance with GAAP (unless otherwise instructed by RAP in which case such accrual will be accounted for in accordance with RAP).

Section 5.05 Prohibited Acts. Between the date of this Agreement and the Closing, Great Plains will not, and will not permit any

of its Subsidiaries including the Bank to, without the prior written consent of TCBX, except as set forth on Great Plains Confidential Schedule 5.05:

(a) take or fail to take any action that would cause the representations and warranties made in

ARTICLE III to be inaccurate at the time of the Closing or preclude Great Plains from making such representations and warranties at the time of the Closing;

(b) merge into, consolidate with or sell its assets to any other Person or entity, change or amend Great Plains’ or any

of its Subsidiaries’ certificate of incorporation, articles of association, or bylaws, increase the number of shares of Great Plains Stock or any of its Subsidiaries’ stock outstanding or increase the amount of the Bank’s surplus

(as calculated in accordance with the instructions to the Call Report);

accordance with applicable Law or pursuant to a contract existing as of the date of this Agreement, engage in any transaction with any affiliated Person or allow such Persons to acquire any assets from Great Plains or any of its Subsidiaries, except

(i) in the form of wages, salaries, fees for services, reimbursement of expenses and benefits already granted or accrued under the Employee Plans currently in effect, or (ii) any deposit (in any amount) made by an officer, director or

employee;

(d) declare, set aside or pay any dividends or make any other distribution to its shareholders (including any

share dividend, dividends in kind or other distribution) whether in cash, shares or other property or purchase, retire or redeem, or obligate itself to purchase, retire or redeem, any of its capital shares or other securities;

(e) discharge or satisfy any Lien or pay any obligation or liability, whether absolute or contingent, due or to become due,

except in the ordinary course of business consistent with past practices and except for liabilities incurred in connection with the transactions contemplated hereby;

(f) issue, reserve for issuance, grant, sell or authorize the issuance of any shares of its capital stock or other securities

or subscriptions, phantom stock, options, warrants, calls, rights or commitments of any kind relating to the issuance thereto;

(g) accelerate the vesting of pension or other benefits in favor of employees of Great Plains or any of its Subsidiaries except

according to the Employee Plans or as otherwise contemplated by this Agreement or as required by applicable Law;

(h) acquire any capital stock or other equity securities or acquire any

equity or ownership interest in any bank, corporation, partnership or other entity (except (i) through settlement of indebtedness, foreclosure, or the exercise of creditors’ remedies or (ii) in a fiduciary capacity, the ownership of

which does not expose it to any liability from the business, operations or liabilities of such Person);

(i) mortgage,

pledge or subject to Lien any of its property, business or assets, tangible or intangible, except (i) Permitted Encumbrances and (ii) pledges of assets to secure public funds deposits and Federal Home Loan Bank borrowings;

(j) sell, transfer, lease to others or otherwise dispose of any of its assets, or cancel or compromise any debt or claim, or

waive or release any right or claim of a market value in excess of $50,000;

(k) make any change in the rate or timing of

payment of compensation, commission, bonus or other direct or indirect remuneration payable, or pay or agree or orally promise to pay, conditionally or otherwise, any bonus, extra compensation, pension or severance or vacation pay, to or for the

benefit of any of its shareholders, directors, officers, employees or agents, other than periodic increases in compensation consistent with past practices, and bonuses, commissions, and incentives consistent with past and normal practices to its

employees and officers;

(l) enter into any employment or consulting contract (other than as contemplated by the terms of

this Agreement) or other agreement with any current or proposed director, officer or employee, amend any Employment Agreement, or adopt, amend in any material respect or terminate any pension, employee welfare, retirement, stock purchase, stock

option, phantom stock, stock appreciation rights, termination, severance, income protection, golden parachute, savings or profit-sharing plan (including trust agreements and insurance contracts embodying such plans), any deferred compensation, or

collective bargaining agreement, any group insurance contract or any other incentive, welfare or employee benefit plan or agreement for the benefit of its directors, employees or former employees, except, in each case, as required by applicable Law,

the terms of the applicable Employee Plan, or by this Agreement;

(m) make any capital expenditures or capital additions or

betterments except for such capital expenditures or capital additions that are set forth in writing in the budget provided to TCBX, that are necessary to prevent substantial deterioration of the condition of a property or that do not exceed $50,000

in the aggregate;

(n) sell or dispose of, or otherwise divest itself of the ownership, possession, custody or control, of

any corporate books or records of any nature that, in accordance with sound business practice, normally are retained for a period of time after their use, creation or receipt, except at the end of the normal retention period;

(o) make any, or acquiesce with any, change in any (i) credit underwriting standards or practices, including loan loss

reserves, (ii) asset liability management techniques, or (iii) accounting methods, principles or material practices, except as required by changes in GAAP as concurred in by Great Plains’ independent auditors, or as required by any

applicable Regulatory Agency;

(p) file any amended Tax Return, waive or extend any period related to the

assessment or collection of any Tax, settle or compromise any Tax Proceeding relating to Great Plains or any of its Subsidiaries, enter into any “closing agreement” within the meaning of Section 7121 of the Code (or any similar

provision of state, local or non-U.S. Law) or other Tax related agreement with any Governmental Entity with respect to any Taxes or Tax Return, make, seek or submit any application for a voluntary disclosure

or voluntary disclosure agreement, surrender any claim to a Tax refund, or change any method of Tax accounting or reporting period;

(q) reduce the amount of the Bank’s allowance for credit losses except through charge offs;

(r) sell (but payment at maturity is not a sale) or purchase any investment securities, other than purchases of obligations of

the U.S. Treasury (or any agency thereof) with a duration of one (1) year or less and an AA rating by at least one nationally recognized ratings agency;

(s) renew, extend the maturity of, or alter any of the terms of any loan classified by Great Plains as “watch,”

“special mention,” “substandard,” “doubtful,” and “non-accrual” or other words of similar import or make, commit to make, renew, extend the maturity of, or alter

any of the material terms of any loan in excess of $1,000,000, provided that (i) prior to taking one or more of the actions described in the foregoing clause with respect to any such loan, the Bank shall cause the loan credit memorandum with

respect to such action or loan to be transmitted by email to the TCBX Loan Representative at the email address specified in Section 10.12, (ii) upon receipt of such loan credit memorandum, the TCBX Loan Representative

promptly will review the proposed action or loan and may, within two Business Days of receipt of the loan credit memorandum, request in writing such additional information with respect to such action or loan as the TCBX Loan Representative may

reasonably determine necessary (which request may be made by return email), and (iii) the TCBX Loan Representative shall, within two Business Days of the receipt of the latter of the loan credit memorandum or, if timely requested, the receipt

of such additional information, approve or disapprove such action or loan in writing (which approval or disapproval may be given by return email), provided that if the TCBX Loan Representative fails to timely approve or disapprove or fails to timely

give notice of such approval or disapproval, the TCBX Loan Representative shall be deemed to have approved such action or loan;

(t) enter into any acquisitions or leases of real property, including new leases and lease extensions; or

(u) take or omit to take any action that could reasonably be expected to prevent the Integrated Mergers from qualifying as a

“reorganization” under Section 368(a) of the Code.

Section 5.06 Access; Pre-Closing

Investigation.

(a) Upon reasonable notice and subject to applicable Laws, Great Plains will afford the officers,

directors, employees, attorneys, accountants, investment bankers and authorized representatives of TCBX full access to the properties, books, contracts and records of Great Plains and each of its Subsidiaries, permit TCBX to make such inspections

(including with regard to such properties physical inspection of the surface and subsurface thereof and any structure thereon pursuant to Section 5.12) as TCBX may require and furnish to TCBX during such period all such

information concerning Great Plains, each of its Subsidiaries and its affairs as TCBX may reasonably request, in order that TCBX may have full opportunity to make such reasonable investigation as it desires to make of the affairs of Great Plains and

each of its Subsidiaries, including access sufficient to verify the value of the assets and the liabilities of Great Plains and each of its Subsidiaries and the satisfaction of the conditions precedent to TCBX’s obligations described in

ARTICLE VIII of this Agreement. TCBX will use its commercially reasonable efforts not to disrupt the normal business operations of Great Plains or any of its Subsidiaries. Great Plains agrees at any time, and from time to

time, to furnish to TCBX as soon as practicable, any additional information that TCBX may reasonably request. Neither Great Plains nor any of its Subsidiaries shall be required to afford or provide access to, permit the inspection of, or furnish or

disclose properties, books, contracts, records, structures or information (i) that constitutes confidential supervisory information of Great Plains or the Bank (as such term is defined in 12 C.F.R. Section 261.2), or (ii) where such

access or disclosure would violate or prejudice the rights of Great Plains’ or any of its Subsidiaries’ customers, jeopardize the attorney-client privilege of the institution in possession or control of such information (after giving due

consideration to the existence of any common interest, joint defense or similar agreement between the parties) or contravene any Law, rule, regulation, order, judgment, decree, fiduciary duty or binding agreement entered into prior to the date of

this Agreement.

(b) No investigation by either party of the business and affairs of the other shall affect or be deemed to

modify or waive any representation, warranty, covenant or agreement in this Agreement, or the conditions to either party’s obligation to consummate the transactions contemplated by this Agreement.

Section 5.07 Additional Financial Statements. Great Plains will promptly furnish TCBX with true and complete copies of

(a) each Call Report prepared after the date of this Agreement as soon as such reports are filed with the FDIC, (b) the consolidated balance sheet of Great Plains as of the end of each quarter during the term of this Agreement, the

consolidated statement of income and changes in stockholders’ equity of Great Plains and its Subsidiaries for each quarter during the term of this Agreement, as soon as each such compiled financial statement is made available to Great Plains,

(c) unaudited month-end financial statements of Great Plains, and (d) each Tax Return for either Great Plains or its Subsidiaries prepared after the date of this Agreement as soon as said Tax Returns

are filed with the IRS or other Governmental Entity.

Section 5.08 Untrue Representation. Great Plains will promptly notify TCBX in

writing if Great Plains becomes aware of any fact or condition that makes untrue, or shows to have been untrue, in any material respect, any schedule or any other information furnished to TCBX or any representation or warranty made in or pursuant to

this Agreement or that results in the failure of Great Plains or any of its Subsidiaries to comply with any covenant, condition or agreement contained in this Agreement in all material respects.

Section 5.09 Litigation and Claims. Great Plains will promptly notify TCBX in writing of any litigation, or of any claim,

controversy or contingent liability that might reasonably be expected to become the subject of litigation, against Great Plains or any of its Subsidiaries or affecting any of their properties, and Great Plains will promptly notify TCBX of any legal

action, suit or proceeding or judicial, administrative or governmental investigation, pending or, to the Knowledge of Great Plains, threatened against Great Plains or any of its Subsidiaries that questions or might question the validity of this

Agreement or the agreements contemplated hereby or any actions taken or to be taken by Great Plains or any of its Subsidiaries pursuant hereto or thereto or seeks to enjoin or otherwise restrain the transactions contemplated hereby or thereby.

Section 5.10 Material Adverse Changes. Great Plains will promptly notify TCBX in writing if any change or development has occurred

or, to the Knowledge of Great Plains, been threatened (or any development has occurred or been threatened involving a prospective change) that (a) is reasonably likely to have, individually or in the aggregate, a Material Adverse Change on

Great Plains or any of its Subsidiaries, (b) would adversely affect, prevent or delay the obtaining of any regulatory approval for the completion of the transactions contemplated by this Agreement, or (c) would cause the conditions in

ARTICLE VIII not to be satisfied.

Section 5.11 Consents and Approvals. Great Plains will use its

commercially reasonable efforts to obtain at the earliest practicable time all consents and approvals from third parties, including those listed on Great Plains Confidential

Schedule 2.02(i).

Section 5.12 Environmental Investigation.

(a) TCBX and its consultants, agents and representatives will have the right, to the same extent that Great Plains has the

right, if any, but not the obligation or responsibility, to inspect any Property, at TCBX’s sole cost and expense, including conducting asbestos surveys and sampling, environmental assessments and investigations, and other environmental

surveys and analyses including soil and ground sampling (“Environmental Inspections”) at any time on or prior to the date that is forty-five (45) days after the date of this Agreement. TCBX will notify Great Plains prior to

any physical inspections of the Property, and Great Plains may place reasonable restrictions on the time of such inspections. If, as a result of any such Environmental Inspection, further investigation (“Secondary Investigation”)

including, test borings, soil, water and other sampling is deemed desirable by TCBX, TCBX will (i) notify Great Plains of any Property for which it intends to conduct such a Secondary Investigation and the reasons for such Secondary

Investigation, and (ii) commence such Secondary Investigation, on or prior to the date that is seventy-five (75) days after the date of this Agreement. TCBX will give reasonable notice to Great Plains of such Secondary Investigations, and

Great Plains may place reasonable time and place restrictions on such Secondary Investigations.

(b) Great Plains agrees to make available to TCBX and its consultants,

agents and representatives all documents and other material relating to environmental conditions of any Property including the results of other Environmental Inspections and surveys. Great Plains also agrees that all engineers and consultants who

prepared or furnished such reports may discuss such reports and information with TCBX and will be entitled to certify the same in favor of TCBX and its consultants, agents and representatives and make all other data available to TCBX and its

consultants, agents and representatives.

Section 5.13 Registration Statement and Joint Proxy Statement/Prospectus.

(a) Great Plains agrees to cooperate and assist TCBX in (i) preparing a Registration Statement on Form S-4 (the “Registration Statement”), in which the Joint Proxy Statement/Prospectus will be included as a prospectus, relating to the shares of TCBX Common Stock to be issued as the Merger

Consideration provided for herein, and the Joint Proxy Statement/Prospectus, and (ii) filing the Registration Statement and the Joint Proxy Statement/Prospectus (forming a part of the Registration Statement) with the SEC, including furnishing

to TCBX all information concerning Great Plains and each of its Subsidiaries that TCBX may reasonably request in connection with preparation of such Registration Statement and Joint Proxy Statement/Prospectus. A Change in Recommendation effected in

accordance with the provisions of Section 5.22 will not constitute a breach by Great Plains of this Agreement, provided that Great Plains is not in breach of Section 5.22. None of the information

supplied or to be supplied by Great Plains or any of its directors, officers, employees or agents for inclusion in the Registration Statement or the Joint Proxy Statement/Prospectus shall, at the date the Joint Proxy Statement/Prospectus is mailed

to the shareholders of Great Plains and TCBX and, as the Registration Statement and the Joint Proxy Statement/Prospectus may be amended or supplemented, at the time of the Great Plains Shareholders’ Meeting and the TCBX Shareholders’

Meeting, contain any untrue statement of a material fact or omit to state any material fact with respect to Great Plains necessary in order to make the statements therein with respect to Great Plains, in light of the circumstances under which they

are made, not misleading or necessary to correct any statement in any earlier communication with respect to the solicitation of any proxy for the Great Plains Shareholders’ Meeting or the TCBX Shareholders’ Meeting. All documents that

Great Plains is responsible for filing with any Regulatory Agency in connection with the Merger shall comply with respect to Great Plains in all material respects with the provisions of applicable Law.

(b) The Great Plains Board has resolved to recommend to the Great Plains shareholders that they approve this Agreement, the

Merger and the transactions contemplated hereby and shall submit to its shareholders this Agreement and any other matters required to be approved by its shareholders in order to carry out the purposes of this Agreement. Subject to a Change in

Recommendation in accordance with Section 5.22 (provided that Great Plains is not in breach of Section 5.22), the Great Plains Board shall (i) include in the Joint Proxy Statement/Prospectus

the recommendation of the Great Plains Board that the shareholders of Great Plains vote in favor of this Agreement, the Merger and the transactions contemplated hereby, (ii) use its commercially reasonable efforts to obtain such shareholder

approval of this Agreement, the Merger and the transactions contemplated hereby, (iii) perform such other acts as may reasonably be requested by TCBX intended to ensure that such shareholder approval of this Agreement, the Merger and the

transactions contemplated hereby are obtained, and (iv) cause the Joint Proxy Statement/Prospectus to be mailed to the shareholders of Great Plains as soon as practicable after the Registration Statement becomes effective with the SEC.

information that would cause any of the statements in the Joint Proxy Statement/Prospectus to be false or misleading with respect to any material fact, or to omit to state any material fact necessary to make the statements therein not false or

misleading, Great Plains shall promptly inform TCBX thereof and take the necessary steps to correct the Joint Proxy Statement/Prospectus.

Section 5.14 Benefit Plans.

(a) Great Plains will take, and will cause each of its Subsidiaries to take, all action necessary to terminate any Employee

Plan that is intended to be a Code section 401(a) qualified retirement plan (each a “Retirement Plan”) and related trust sponsored by Great Plains or any of its Subsidiaries, effective no later than the date immediately

before the Closing Date. Great Plains will provide TCBX evidence or such other confirmation from Great Plains which TCBX deems appropriate that (i) each such Retirement Plan has been terminated as set forth in this

Section 5.14(a) pursuant to duly authorized corporate action and (ii) at the request of TCBX, Great Plains will submit to the IRS an application for determination of the tax qualified status of any qualified plan

relating to its termination. Provided TCBX’s request to file an application for determination is given at least ninety (90) days prior to the Closing, such application will be filed on or before the Closing. Any costs incurred prior to

the Closing related to the termination of each Retirement Plan shall be paid (including all related legal, administrative and other costs and expenses unless specifically set forth otherwise in this subsection) solely by Great Plains and reflected

in the calculation of Adjusted Equity.

(b) At the direction of TCBX, Great Plains will take, and will cause each of its

Subsidiaries to take, all action necessary to terminate any Employee Plan that is an employee welfare benefit plan, as defined in ERISA Section 3(1) (“Welfare Plan”), effective not later than immediately before the Closing.

Great Plains will provide TCBX evidence or such other confirmation from Great Plains which TCBX deems appropriate that each such Welfare Plan has been terminated as set forth in this Section 5.14(b) pursuant to duly

authorized corporate action. Notwithstanding the foregoing, without the consent of TCBX, Great Plains shall not take, or permit any of its Subsidiaries to take, any action to terminate any Welfare Plan that is a group medical plan.

Section 5.15 Termination of Contracts.

(a) Great Plains and each of its Subsidiaries will, with regard to any contract to which Great Plains or any of its

Subsidiaries is a party identified by TCBX prior to the Calculation Date, cooperate with and take such actions as reasonably requested by TCBX to terminate any such contract on a date to be determined by TCBX, in its sole discretion. Any and all

costs, fees, expenses, contract payments, penalties or liquidated damages necessary to be paid by Great Plains or any of its Subsidiaries in connection with the termination of any contract, regardless of whether such contract is identified by TCBX,

shall be accrued or paid by Great Plains or its Subsidiaries on or prior to the Calculation Time in accordance with this Section 5.15(a) and shall be reflected in the

calculation of Adjusted Equity as contemplated by Section 1.06(a). For the avoidance of doubt, TCBX will not pay or be responsible for the payment of any costs, fees, expenses, contract payments, penalties or liquidated

damages in connection with the termination of any contract, unless Great Plains has accrued on or prior to the Calculation Time, but has not paid before Closing, any such costs, fees, expenses, contract payments, penalties or liquidated damages.

(b) Great Plains and each of its Subsidiaries will cooperate with TCBX in TCBX’s negotiation in good faith of a

reasonable settlement of the termination of Great Plains’ and/or each of its Subsidiaries’ data processing/technology contracts listed on Great Plains Confidential

Schedule 5.15(b) and Great Plains and each of its Subsidiaries will take such actions as reasonably requested by TCBX in connection with the termination of such contracts, to ensure that if the Merger occurs,

the data processing/technology contracts listed on Great Plains Confidential Schedule 5.15(b) will be terminated in connection with the consummation of the Merger; provided, that any and

all costs, fees, expenses, contract payments, penalties or liquidated damages necessary to be paid by Great Plains or any of its Subsidiaries in connection with the termination of such data processing and technology contracts shall be accrued or

paid by Great Plains or its Subsidiaries on or prior to the Calculation Time in accordance with this Section 5.15(b) and shall be reflected in the calculation of Adjusted Equity as contemplated by

Section 1.06(a).

pursuant to this Section 5.15 will be in accordance with the terms of such contracts.

Section 5.16

Conforming Accounting Adjustments. Great Plains and each of its Subsidiaries shall, if requested by TCBX, consistent with GAAP, immediately prior to Closing, make such accounting entries as TCBX may reasonably request in order to conform the

accounting records of Great Plains and each of its Subsidiaries to the accounting policies and practices of TCBX; provided, however, that no such adjustment shall (a) constitute or be deemed to be a breach, violation or failure to satisfy any

representation, warranty, covenant, condition or other provision or constitute grounds for termination of this Agreement (except to the extent that a certain representation, warranty, covenant or other provision is breached and thus, requires the

adjustment), (b) require any prior filing with any governmental agency or regulatory authority, (c) violate any Law, rule or regulation applicable to Great Plains or any of its Subsidiaries, (d) adversely affect the calculation of

Adjusted Equity, or (e) be an acknowledgment by Great Plains (i) of any adverse circumstances for purposes of determining whether the conditions to TCBX’s obligations under this Agreement have been satisfied, (ii) that such

adjustment is required for purposes of determining satisfaction of the condition to TCBX’s obligations under this Agreement set forth in Section 8.07 or (iii) that such adjustment has any bearing on the Merger

Consideration.

Section 5.17 Regulatory and Other Approvals. Great Plains, at its own expense,

will promptly file or cause to be filed applications for all regulatory approvals required to be obtained by Great Plains in connection with this Agreement and the other agreements contemplated hereby. Great Plains will promptly furnish TCBX with

copies of all such regulatory filings and all correspondence for which confidential treatment has not been requested. Great Plains will use its commercially reasonable efforts to obtain all such regulatory approvals and any other approvals from

third parties at the earliest practicable time.

Section 5.18 Tax Matters.

(a) All transfer, documentary, sales, use, stamp, registration and other similar Taxes and all conveyance fees, recording

charges and other fees and charges (including any penalties and interest) incurred in connection with the consummation of the transactions contemplated by this Agreement (“Transfer Taxes”), if any, shall be paid by the party

liable for such Transfer Tax under Law when due, and the party required by Law will, at its own expense, file all necessary Tax Returns and other documentation with respect to all such Transfer Taxes, and, if required by applicable Law, the other

party will, and will cause its Affiliates to, join in the execution of any such Tax Returns and other documentation.

(b)

Great Plains and TCBX further agree, upon request, to use their commercially reasonable efforts to obtain any certificate or other document from any Governmental Entity or any other Person as may be necessary to mitigate, reduce or eliminate any

Transfer Tax that could be imposed.

Plains with respect to certain tax matters arising under this Section 5.18 (together with any successor appointed in accordance with this Section 5.18, “Shareholders’

Representative”). The Shareholders’ Representative may resign at any time upon written notice to TCBX; provided, however, that no such resignation shall be effective until a successor Shareholders’ Representative has been

appointed and has accepted such appointment. In the event of the death, incapacity, resignation or other inability or unwillingness of the Shareholders’ Representative to serve, a successor Shareholders’ Representative shall be appointed

by the holders of a majority of the outstanding shares of Great Plains Stock as of immediately prior to the Effective Time, determined without giving effect to the transactions contemplated by this Agreement. Any such appointment shall become

effective upon the delivery to TCBX of written notice thereof, together with the successor Shareholders’ Representative’s written acceptance of such appointment. Each successor Shareholders’ Representative shall have all of the

rights, powers, authority and obligations conferred upon the Shareholders’ Representative under this Section 5.18. The Shareholders’ Representative shall prepare and file or cause to be prepared and filed, at

the expense of such shareholders, all federal and state income Tax Returns for Great Plains, and its Subsidiaries, for all Tax periods ending on or before the Closing Date (the “Pre-Closing Tax

Returns”). All such Pre-Closing Tax Returns shall be prepared in a manner consistent with past custom and practice and any existing elections of Great Plains and its Subsidiaries, unless otherwise

required by Law. The Shareholders’ Representative shall provide TCBX with a draft copy of each such Pre-Closing Tax Return at least fifteen (15) Business Days prior to the due date for such Pre-Closing Tax Return (and prior to filing such Pre-Closing Tax Return) and shall allow TCBX to review, comment upon and reasonably approve without undue delay each such Pre-Closing Tax Return.

(d) In the event of any Tax Proceeding of Great Plains’ or its

Subsidiaries’ federal or state Tax Returns prior to the consummation of the Integrated Mergers, Great Plains shall (i) keep TCBX reasonably informed of the progress of such Tax Proceeding (including providing TCBX copies of all material

correspondence, pleadings, protests, briefs and other documents pertaining to such Tax Proceeding), (ii) allow TCBX to participate in such Tax Proceeding with counsel of its choice at its own expense, and (iii) not settle, compromise, or

otherwise resolve such Tax Proceeding without the prior written consent of TCBX (which consent shall not be unreasonably withheld, conditioned or delayed).

Section 5.19 Disclosure Schedules. At least ten (10) days prior to the Closing, Great Plains agrees to provide TCBX

with supplemental disclosure schedules reflecting any material changes thereto between the date of this Agreement and the Closing Date. Delivery of such supplemental disclosure schedules shall not cure a breach or modify a representation or warranty

of this Agreement.

Section 5.20 Transition.

(a) The senior officers of Great Plains and the Bank agree to meet with senior officers of TCBX as reasonably requested by TCBX

to review the financial and operational affairs of the Bank, and to the extent permitted by applicable Law, each of Great Plains and the Bank agrees to give due consideration to TCBX’s input on such matters, consistent with this

Section 5.20, with the understanding that TCBX shall in no event be permitted to exercise control of Great Plains or the Bank prior to the Effective Time and, except as specifically provided under this Agreement, Great

Plains and the Bank shall have no obligation to act in accordance with TCBX’s input. Commencing after the date hereof and to the extent permitted by applicable Law, TCBX, Great Plains and the Bank shall use their commercially reasonable

efforts to plan the integration of Great Plains and the Bank with the businesses of TCBX and their respective Affiliates to be effective as much as practicable as of the Closing Date; provided, however, that in no event shall TCBX or its Affiliates

be entitled to control Great Plains or the Bank prior to the Effective Time. Without limiting the generality of the foregoing, from the date hereof through the Effective Time and consistent with the performance of their day-to-day operations and the continuous operation of Great Plains and the Bank in the ordinary course of business, Great Plains’ and the Bank’s employees and

officers shall use their commercially reasonable efforts to provide support, including support from Great Plains’ and the Bank’s outside contractors, and to assist TCBX in performing all tasks, including, without limitation, equipment

installation, reasonably required to result in a successful integration at the Closing. TCBX shall provide such assistance of its personnel as Great Plains and the Bank shall request to permit Great Plains and the Bank to comply with their

obligations under this Section 5.20.

(b) From and after the date hereof, each of Great Plains

and the Bank shall use its commercially reasonable efforts, and shall use its commercially reasonable efforts to cause its agents to, permit TCBX to take all reasonable actions, at TCBX’s sole cost and expense, that TCBX deems necessary or

appropriate, and to cooperate and to use its commercially reasonable efforts to cause its agents to cooperate in the taking of such

actions, to enable TCBX, after the Closing, to satisfy the applicable obligations under Sections 302, 404 and 906 of the Sarbanes-Oxley Act of 2002 (the “SOA”) and the

other requirements of the SOA with respect to Great Plains and the Bank, including establishing and maintaining adequate disclosure controls and procedures and internal controls over financial reporting as such terms are defined in the SOA.

Section 5.21 Execution of Releases. Great Plains shall use commercially reasonable efforts to cause the persons set forth on

Great Plains Confidential Schedule 8.06 to take such action as they are required to, in order to execute the releases as described in Section 8.06.

Section 5.22 No Solicitation.

(a) Subject to the provisions of this Section 5.22, Great Plains will not, and will cause its

Subsidiaries not to, and will cause Great Plains’ and its Subsidiaries’ respective officers, directors, employees, Affiliates, agents and representatives not to, directly or indirectly, (i) initiate or solicit or knowingly encourage

any inquiries with respect to, or the making of, any Acquisition Proposal, or (ii) except as permitted below, (A) engage in negotiations or discussions with or provide any information or data to, any Person relating to an Acquisition

Proposal, (B) approve, endorse or recommend, or propose publicly to approve, endorse or recommend, any Acquisition Proposal, or (C) execute or enter into any letter of intent, agreement in principle, merger agreement, acquisition agreement

or other similar agreement relating to any Acquisition Proposal. Great Plains shall, and shall cause each of its officers, directors, employees, Affiliates, agents and representatives to, (x) immediately cease any solicitations, discussions or

negotiations with any Person (other than TCBX) conducted heretofore with respect to any Acquisition Proposal and promptly request return or destruction of confidential information related thereto, (y) not terminate, waive, amend, release or

modify any provision of any confidentiality or standstill agreement relating to any Acquisition Proposal to which it or any of its officers, directors, employees, Affiliates, agents and representatives is a party and (z) use its commercially

reasonable efforts to enforce any confidentiality or similar agreement relating to any Acquisition Proposal.

(b)

Notwithstanding anything to the contrary in this Agreement, at any time prior to obtaining the approval of the Great Plains shareholders, in the event that Great Plains receives a bona fide Acquisition Proposal that is not received in violation of

this Section 5.22, Great Plains and its Board may participate in discussions or negotiations with, or furnish any information to, any Person making such Acquisition Proposal and its agents and representatives or potential

sources of financing that need to be involved in such discussion if the Great Plains Board determines in good faith, after consultation with its counsel and financial advisor, that such Person is reasonably likely to submit to Great Plains a

Superior Proposal and that failure to take such action would reasonably be expected to be inconsistent with the Great Plains Board’s fiduciary duties; provided, however, that, prior to providing any nonpublic information to such Person or

participating in discussions or negotiations with such Person, Great Plains shall have entered into a confidentiality agreement with such Person on terms that are substantially similar to the confidentiality provisions of the Confidentiality

Agreement and that any nonpublic information concerning Great Plains and its Subsidiaries provided to such Person, to the extent not previously provided to TCBX, is promptly provided to TCBX. In addition, nothing herein shall restrict Great Plains

from complying with its disclosure obligations with regard to any Acquisition Proposal under applicable Law.

(48) hours) notify TCBX of the receipt by Great Plains of any Acquisition Proposal, which notice shall include the material terms of and identity of the Person(s) making such Acquisition Proposal. Great Plains will keep TCBX reasonably informed

of the status and material terms and conditions of any such Acquisition Proposal and of any material amendments or proposed material amendments thereto.

(d) The Great Plains Board may, at any time prior to obtaining the approval of the Great Plains shareholders, (i) approve,

endorse or recommend a Superior Proposal or enter into a definitive agreement with respect to a Superior Proposal or (ii) modify or amend in a manner adverse to TCBX or withdraw the Great Plains Recommendation ((i) or (ii) above being

referred to as a “Change in Recommendation”), provided that (x) prior to such Change in Recommendation, the Great Plains Board shall determine, in good faith (after consultation with its counsel), that the failure to take

such action would be inconsistent with the directors’ fiduciary duties under applicable Law and (y) such Change in Recommendation is in connection with a Superior Proposal and such Superior Proposal has been made and has not been

withdrawn and continues to be a Superior Proposal after taking into account any action taken by TCBX pursuant to Section 5.22(e).

(e) Notwithstanding anything to the contrary contained in this Agreement, Great Plains may not terminate this Agreement to

enter into a definitive agreement with respect to a Superior Proposal unless (i) it notifies TCBX in writing of its intention to take such action at least three (3) Business Days prior to taking such action, specifying the material terms

of any applicable Superior Proposal, identifying the Person(s) making such Superior Proposal and providing TCBX an unredacted copy of all of the agreements with the party making such Superior Proposal, (ii) TCBX does not make, after being

provided with reasonable opportunity to negotiate with Great Plains and its agents and representatives, within such three (3) Business Day period, irrevocable adjustments in the terms and conditions of this Agreement that the Great Plains Board

determines, in good faith after consultation with its counsel and financial advisors, is at least as favorable to Great Plains’ shareholders as such Superior Proposal and (iii) Great Plains is not in material breach of this

Section 5.22.

Section 5.23 Directors’ and Officers’

Indemnification and Insurance.

(a) By virtue of the occurrence of the Integrated Mergers, TCBX shall, from and after

the Effective Time, succeed to Great Plains’ and the Bank’s obligations with respect to indemnification or exculpation now existing in favor of the directors, officers, employees and agents of Great Plains and the Bank, respectively, as

provided in their certificate of incorporation, articles of association, bylaws, indemnification agreements or otherwise in effect as of the date of this Agreement with respect to matters occurring prior to the Effective Time (collectively, the

“Existing Indemnification Obligation”). TCBX hereby guaranties Great Plains’ indemnification obligations.

(b) Except to the extent prohibited by applicable Law, following the

Effective Time and for a period of six (6) years thereafter, TCBX shall indemnify, defend, and hold harmless any Person who has rights to indemnification from Great Plains, under the Existing Indemnification Obligation.

coverage policy relating to the policies of directors’ and officers’ liability insurance and (ii) a two (2) year tail insurance coverage policy relating to the policy of cyber liability insurance, currently maintained by Great

Plains and the Bank as of the date hereof with respect to claims arising from facts or events that occurred on or prior to the Effective Time (including the transactions contemplated hereby) as currently maintained by Great Plains (collectively, the

“Tail Policy”), on terms no less advantageous than those contained in Great Plains’ existing directors’ and officers’ and company’s liability insurance policy and cyber liability insurance policy; provided,

however, that Great Plains shall not be obligated to expend, on an annual basis, an amount in excess of 200% of the current annual premium paid as of the date hereof by Great Plains for such insurance.

(d) If TCBX or TCB or any of their successors or assigns (i) consolidates with or merges into any other Person and shall

not be the continuing or surviving entity of such consolidation or merger, or (ii) transfers or conveys all or substantially all of its properties or assets to any Person, then, and in each such case, to the extent necessary, provision shall be

made so that the successors and assigns of TCBX or TCB expressly assume the obligations set forth in this Section 5.23.

(e) The provisions of this Section 5.23 are intended to be for the benefit of, and shall be

enforceable by, each Person who is now, or has been at any time prior to the date of this Agreement or who becomes prior to the Effective Time, an officer or director of Great Plains or the Bank (the “Indemnified Parties”) and his

or her heirs and representatives and are in addition to, and not in substitution for, any other rights to indemnification or contribution that any such person may have by contract or otherwise.

(f) Any Indemnified Party wishing to claim indemnification under this Section 5.23, upon learning of

any Claim, shall promptly notify TCBX in writing thereof. In the event of any such claim for indemnification (whether arising before or after the Effective Time): (i) TCBX shall have the right to assume the defense thereof and TCBX shall

not be liable to such Indemnified Parties for any legal expenses of other counsel or any other expenses subsequently incurred by such Indemnified Parties in connection with the defense thereof, except that if TCBX elects not to assume such defense

or counsel for the Indemnified Parties advises that there are substantive issues which raise conflicts of interest between TCBX and the Indemnified Parties, then the Indemnified Parties may retain counsel satisfactory to them, and TCBX shall pay all

reasonable fees and expenses of such counsel for the Indemnified Parties in accordance with its historical business practices; provided that TCBX shall be obligated pursuant to this Section 5.23(f) to pay for only

one (1) firm of counsel for all Indemnified Parties in any jurisdiction; (ii) the Indemnified Parties will cooperate in the defense of any such matter; and (iii) TCBX shall not be liable for any settlement effected without its prior

written consent; provided that

TCBX shall not have any obligation hereunder to any Indemnified Party and such Indemnified Party shall reimburse TCBX for any fees and expenses of such Indemnified Party’s counsel that were

paid by TCBX, when and if a court of competent jurisdiction shall determine, and such determination shall have become final, that the indemnification of such Indemnified Party in the manner contemplated hereby is prohibited by applicable Law.

Section 5.24 Tax Certificate. An authorized officer of Great Plains shall execute and deliver to Norton Rose Fulbright US

LLP and Fenimore Kay Harrison LLP, respectively, one or more certificates (each, a “Great Plains Certificate”) containing appropriate representations and covenants, reasonably satisfactory in form and substance to each counsel, at

such time or times as may be reasonably requested by each counsel (including as of the Closing Date and in connection with the filing of the Registration Statement), in connection with each counsel’s deliveries of an opinion with respect to

the U.S. federal income tax treatment of the Integrated Mergers pursuant to Section 8.15 and Section 7.10 and/or in connection with the filing of the Registration Statement, and Great Plains shall

also provide such other information as reasonably requested by each counsel for purposes of rendering such opinions. Great Plains and its Subsidiaries shall not take (or omit to take) or cause to be taken (or omitted) any action that would cause to

be untrue (or fail to take or cause not to be taken any action that would cause to be untrue) any of the certifications, representations, warranties and covenants included in a Great Plains Certificate.

Section 5.25 Retention Agreements. Great Plains shall use commercially reasonable efforts to cause each of the persons set forth

on TCBX Confidential Schedule 5.25 to execute and deliver to TCBX prior to the Closing Date a retention agreement in a form reasonably acceptable to TCBX.

Section 5.26 Assumed Debt. The parties hereto agree to execute and deliver, or cause to be executed and delivered, at or prior to

the Effective Time, one or more supplemental indentures and/or such other documents or instruments as may be required for the due and full assumption by TCBX at the Effective Time of Great Plains’ obligations in respect of the trust preferred

and subordinated debt securities set forth on Great Plains Confidential Schedule 5.26 and, to the extent required by the terms thereof, any other outstanding debt, notes, guarantees, securities, or other instruments. Great Plains

agrees to cooperate as reasonably requested by TCBX in connection with such assumption.

Section 5.27 Great Plains Loan

Agreement. Great Plains shall, and shall cause the Bank to, (i) arrange for delivery to TCBX of the Payoff Documentation at least two (2) Business Days prior to the Closing, with agreed-form drafts of such Payoff Documentation to be

delivered at least five (5) Business Days prior to the Closing and (ii) take all other actions reasonably requested by TCBX (including actions to make available cash of Great Plains and its Subsidiaries) to facilitate the payoff, discharge

and termination in full at the Effective Time of all amounts outstanding under the Great Plains Loan Agreement and the release of all related Liens on the assets and equity interests of Great Plains and its Subsidiaries.

ARTICLE VI

COVENANTS OF TCBX

Section 6.01 Commercially Reasonable Efforts. TCBX and Merger Sub shall use commercially reasonable efforts to perform and fulfill

all conditions and obligations on their part to be performed or fulfilled under this Agreement and to cause the consummation of the transactions contemplated hereby in accordance with the terms and conditions of this Agreement.

Section 6.02 TCBX Shareholders’ Meeting. TCBX, acting through the TCBX Board, shall, in accordance with

applicable Law:

(a) duly call, give notice of, convene and hold a meeting of its shareholders (the “TCBX

approving the TCBX Share Issuance;

(b) require no greater than the minimum vote of the capital stock of TCBX required by

applicable Law in order to approve the TCBX Share Issuance;

recommendation of the TCBX Board that the shareholders of TCBX vote in favor of the approval of the TCBX Share Issuance; and

(d) cause the Joint Proxy Statement/Prospectus to be mailed to the shareholders of TCBX as soon as practicable after the

Registration Statement and the Joint Proxy Statement/Prospectus (forming a part of the Registration Statement) become effective with the SEC, and use its commercially reasonable efforts to obtain the approval of the TCBX Share Issuance by

shareholders holding at least the minimum number of shares of TCBX Common Stock entitled to vote at the TCBX Shareholders’ Meeting necessary to approve the foregoing under applicable Law.

Section 6.03 Regulatory Filings; Registration Statement.

(a) TCBX, at its own expense, with the cooperation of Great Plains, at its own expense, shall promptly file or cause to be

filed within thirty (30) days of the date of this Agreement applications for all regulatory approvals required to be obtained by TCBX in connection with this Agreement and the transactions contemplated hereby, including but not limited to the

necessary applications for the prior approval of the Merger by the Federal Reserve and the TDB.

(b) TCBX shall reserve and

make available for issuance in connection with the Merger, and in accordance with the terms of this Agreement, the shares of TCBX Common Stock for the Merger Consideration and shall, with the cooperation of Great Plains and the Bank, file with the

SEC the Registration Statement, which Registration Statement will contain the Joint Proxy Statement/Prospectus, and TCBX shall use its commercially reasonable efforts to cause the Registration Statement to become effective. At the time the

Registration Statement becomes effective, the Registration Statement shall comply in all

material respects with the provisions of the Securities Act and the published rules and regulations thereunder, and shall not contain any untrue statement of material fact or omit to state a

material fact required to be stated therein or necessary to make the statements therein not false or misleading, and at the time of the mailing thereof to the shareholders of Great Plains and TCBX, at the time of the Great Plains Shareholders’

Meeting and the TCBX Shareholders’ Meeting and on the Effective Time, the Joint Proxy Statement/Prospectus included as part of the Registration Statement, as amended or supplemented by any amendment or supplement, shall not contain any untrue

statement of a material fact or omit to state any material fact necessary to make the statements therein not false or misleading.

(c) TCBX shall timely file all documents required to obtain all necessary Blue Sky permits and approvals, if any, required to

carry out the transactions contemplated by this Agreement, shall pay all expenses incident thereto and shall use its commercially reasonable efforts to obtain such permits and approvals on a timely basis.

(d) TCBX shall promptly and properly prepare and file any filings required under the Securities Act or Exchange Act, relating

to the Merger and the transactions contemplated herein. Great Plains shall have the right to review in advance, subject to applicable Laws relating to the exchange of information, all material non-confidential

written information to be submitted to any Governmental Entity in connection with the transactions contemplated by this Agreement.

(e) TCBX shall keep Great Plains reasonably informed as to the status of such applications and filings and shall notify it

promptly of any developments that reasonably could significantly delay the completion of the Merger.

Section 6.04 Untrue

Representations. TCBX shall promptly notify Great Plains in writing if TCBX becomes aware of any fact or condition that makes untrue, or shows to have been untrue, in any material respect, any schedule or any other information furnished to Great

Plains or any representation or warranty made in or pursuant to this Agreement or that results in the failure of TCBX or Merger Sub to comply with any covenant, condition or agreement contained in this Agreement in all material respects.

Section 6.05 Litigation and Claims. TCBX shall promptly notify Great Plains in writing of any legal action, suit or proceeding or

judicial, administrative or governmental investigation, pending or, to the Knowledge of TCBX, threatened against TCBX or any Subsidiary of TCBX that questions or might question the validity of this Agreement or the agreements contemplated hereby, or

any actions taken or to be taken by TCBX or any Subsidiary of TCBX pursuant hereto or thereto or seeks to enjoin or otherwise restrain the transactions contemplated hereby or thereby.

Section 6.06 Material Adverse Changes. TCBX shall promptly notify Great Plains in writing if any change or development shall have

occurred or, to the Knowledge of TCBX, been threatened (or any development shall have occurred or been threatened involving a prospective change) that (a) is reasonably likely to have, individually or in the aggregate, a Material Adverse Change

on TCBX or TCB, (b) would adversely affect, prevent or delay the obtaining of any regulatory approval for the consummation of the transactions contemplated by this Agreement or (c) would cause the conditions in

ARTICLE VII not to be satisfied.

Section 6.07 Consents and Approvals. TCBX will use its commercially reasonable

efforts to obtain at the earliest practicable time all consents and approvals from third parties, including those listed on TCBX Confidential Schedule 2.03(f).

Section 6.08 Employee Matters.

(a) At the Effective Time, TCBX may, in its sole and absolute discretion, either discontinue the employment of one or more

current employees of Great Plains or any of its Subsidiaries (each, a “Terminated Employee”), or continue the employment of one or more current employees of Great Plains or any of its Subsidiaries (each a “Continuing

Employee”). TCBX shall consult with the Chief Executive Officer of Great Plains with respect to the termination of any such employees in connection with the Closing. Subject to the right of subsequent amendment, modification, replacement

or termination in the sole discretion of TCBX, each Continuing Employee shall be entitled, as an employee of TCBX or its Subsidiaries, to participate in the employee benefit plans of TCBX provided to similarly situated employees of TCBX or its

Subsidiaries. All such participation shall be subject to such terms of such plans as may be in effect from time to time and this Section 6.08 is not intended to give any Continuing Employee any rights or privileges superior

to those of other similarly situated employees of TCBX or its Subsidiaries. The provisions of this Section 6.08 shall not be deemed or construed so as to provide duplication of similar benefits but, subject to that

qualification, TCBX shall, for purposes of vesting and any age or period of service requirements for commencement of participation with respect to any employee benefit plans in which a Continuing Employee may participate (excluding any defined

benefit pension plan), credit each Continuing Employee with his or her term of service with Great Plains or any of its Subsidiaries to the extent such service was recognized under the analogous Employee Plan of Great Plains or any of its

Subsidiaries.

(b) Terminated Employees and Continuing Employees will be eligible to receive the severance set forth on

TCBX Confidential Schedule 6.08, subject to the satisfaction of the terms and conditions set forth on such schedule.

(c) If Continuing Employees become eligible to participate in a medical, dental or health plan of TCBX upon termination of any

such analogous plan of Great Plains or the Bank, TCBX shall use commercially reasonable efforts to cause each such plan of TCBX to (i) waive any preexisting condition limitations to the extent such conditions are covered under the applicable

medical, health or dental plans of TCBX, (ii) give credit toward the satisfaction of any annual deductible limitation and out-of-pocket maximum under such plan for

any deductible, co-payment, or other cost-sharing amounts previously paid by a Continuing Employee under an analogous plan prior to the Effective Time for the plan year in which the Effective Time occurs, and

(iii) waive any waiting period limitation or evidence of insurability requirement which would otherwise be applicable to such Continuing Employee on or after the Effective Time, in each case to the extent such employee had satisfied any similar

limitation or requirement under an analogous plan prior to the Effective Time for the plan year in which the Effective Time occurs.

(d) Nothing in this Agreement shall confer upon any employee, officer,

director, independent contractor or consultant of Great Plains or any of its Subsidiaries or Affiliates any right to continue in the employ or service of the Surviving Corporation, TCBX, or any Subsidiary or Affiliate thereof, or shall interfere

with or restrict in any way the rights of the Surviving Corporation, Great Plains, TCBX or any Subsidiary or Affiliate thereof to discharge or terminate the services of any employee, officer, director or consultant of Great Plains or any of its

Subsidiaries or Affiliates at any time for any reason whatsoever, with or without cause. Nothing in this Agreement shall be deemed to (i) establish, amend, or modify any Employee Plan or any other benefit or employment plan, program, agreement

or arrangement, or (ii) alter or limit the ability of the Surviving Corporation or any of its Subsidiaries or Affiliates to amend, modify or terminate any particular Employee Plan or any other benefit or employment plan, program, agreement or

arrangement after the Effective Time. Without limiting the generality of Section 10.20, nothing in this Agreement, express or implied, is intended to or shall confer upon any Person, including any current or former

employee, officer, director, independent contractor or consultant (or any spouse or dependent of such individual) of Great Plains or any of its Subsidiaries or Affiliates, any right, benefit or remedy of any nature whatsoever under or by reason of

this Agreement.

Section 6.09 Board Seats. At or promptly following the Effective Time, each of TCBX and TCB shall increase by

two (2) the number of directors constituting the TCBX Board and the TCB board of directors, respectively, and appoint Todd Taylor and Paul M. Dickinson, or such other current members of the Great Plains Board as mutually agreed by TCBX and

Great Plains, to the TCBX Board and the TCB board of directors, who shall be subject to TCBX’s standard director qualification procedure. Subject to TCBX’s standard director qualification procedure, TCBX shall (a) include such

individuals in the slate of director nominees recommended by the TCBX Board for election at TCBX’s first annual meeting of shareholders following the Effective Time and shall use such efforts to cause their election at such meeting as it does

for the legacy TCBX directors, and (b) cause TCB to take all actions reasonably necessary to nominate and elect such individuals to the TCB board of directors for the corresponding term following such annual meeting.

Section 6.10 Conduct of Business in the Ordinary Course. Except as specifically provided for in this Agreement, TCBX shall conduct

its business in the ordinary course as heretofore conducted. For purposes of this Section 6.10, the ordinary course of business shall consist of the banking and related business as presently conducted by TCBX and its

Subsidiaries, and engaging in acquisitions and assisting in the management of its Subsidiaries.

Section 6.11 Access to Properties

and Records. To the extent permitted by applicable Law, and solely for the purposes of verifying the representations and warranties of TCBX and preparing for the Merger and the other matters contemplated by this Agreement, TCBX shall, and shall

cause each of its Subsidiaries to, upon reasonable notice from Great Plains to TCBX (a) afford the employees and officers and authorized representatives (including legal counsel, accountants and consultants) of Great Plains, who enter into a non-disclosure agreement with

TCBX in a form acceptable to TCBX, reasonable access to the properties, books and records of TCBX and its Subsidiaries during normal business hours in order that Great Plains may have the

opportunity to make such reasonable investigation of the affairs of TCBX and its Subsidiaries, and (b) furnish Great Plains with such additional financial and operating data and other information as to the business and properties of TCBX as

Great Plains shall, from time to time, reasonably request. Great Plains shall use commercially reasonable efforts to minimize any interference with TCBX’s business operations during any such access. Neither TCBX nor any of its Subsidiaries

shall be required to provide access to or to disclose information where such access or disclosure would violate or prejudice the rights of TCBX’s customers, jeopardize the attorney-client privilege of the institution in possession or control

of such information (after giving due consideration to the existence of any common interest, joint defense or similar agreement between the parties) or contravene any Law, Order, fiduciary duty or binding agreement entered into prior to the date of

this Agreement.

Section 6.12 NYSE Listing. TCBX shall file all documents required to be filed to have the shares of TCBX

Common Stock to be issued pursuant to this Agreement included for listing on the NYSE and use its commercially reasonable efforts to affect said listing.

Section 6.13 Disclosure Schedules. At least ten (10) days prior to the Closing, TCBX agrees to provide Great Plains

of this Agreement.

Section 6.14 No Control of Great Plains’ Business. Nothing contained in this Agreement

gives TCBX or any of their representatives or Affiliates, directly or indirectly, the right to control or direct the operations of Great Plains or the Bank prior to the Effective Time. Prior to the Effective Time, Great Plains shall exercise,

consistent with the terms and conditions of this Agreement, complete control and supervision over the operations of Great Plains and the Bank.

Section 6.15 Tax Matters.

(a) TCBX shall comply with the recordkeeping and information reporting requirements set forth in Treasury Regulation

Section 1.368-3.

(b) Following the Merger, TCBX will use commercially reasonable efforts to not knowingly take any

action or omit to take any action that would reasonably be expected to prevent or impede the Integrated Mergers from qualifying as a reorganization described in Section 368(a) of the Code.

(c) TCBX will prepare and file (or cause to be prepared and filed) all income Tax Returns of TCBX and its Subsidiaries for the

years or periods during which the Integrated Mergers take place, reporting the Integrated Mergers as a “reorganization” described in Section 368(a) of the Code.

Section 6.16 Tax CertificateSection 6.17 . An authorized officer of

TCBX shall execute and deliver to Norton Rose Fulbright US LLP and Fenimore Kay Harrison LLP, respectively, one or more certificates (each, a “TCBX Certificate”) containing appropriate representations and covenants, reasonably

satisfactory in form and substance to each counsel, at such time or times as may be reasonably requested by each counsel (including as of the Closing Date and in connection with the filing of the Registration Statement), in connection with each

counsel’s delivery of an opinion with respect to the U.S. federal income tax treatment of the Integrated Mergers pursuant to Section 7.10 and Section 8.15 and/or in connection with the filing

of the Registration Statement, and TCBX and Merger Sub shall also provide such other information as reasonably requested by each counsel for purposes of rendering such opinions. TCBX and its Subsidiaries shall not take (or omit to take) or cause to

be taken (or omitted) any action that would cause to be untrue (or fail to take or cause not to be taken any action that would cause to be untrue) any of the certifications, representations, warranties and covenants included in a TCBX Certificate.

ARTICLE VII

CONDITIONS PRECEDENT TO THE OBLIGATIONS OF GREAT PLAINS

The obligations of Great Plains under this Agreement are subject to the satisfaction, prior to or at the Closing, of each of the following

conditions, which may be waived in whole or in part by Great Plains:

Section 7.01 Representations and Warranties.

(i) Each of the representations and warranties of TCBX set forth in Section 4.01, Section 4.02, Section 4.03 (other than inaccuracies that are de minimis in amount

and effect) and Section 4.15 shall be true and correct in all respects at and as of the date of this Agreement and at and as of the Closing Date as though made at and as of the Closing Date (unless any such representation

or warranty is made only as of a specific date, in which case as of such specific date) and (ii) each of the other representations and warranties made by TCBX in this Agreement or in any document or schedule delivered to Great Plains in

connection with this Agreement being true and correct in all material respects (except to the extent such representations and warranties are qualified by their terms by reference to “material,” “materiality,” “in all

material respects,” “Material Adverse Change,” or the like, in which case such representations and warranties as so qualified are true and correct in all respects) when made and being true and correct in all material respects as of

the Closing with the same force and effect as if such representations and warranties were made at and as of the Closing, except with respect to those representations and warranties specifically made as of an earlier date (in which case such

representations and warranties must have been true and correct as of such earlier date).

Section 7.02 Performance of

Obligations. TCBX and Merger Sub have, or have caused to be, performed or observed, in all material respects, all obligations and agreements required to be performed or observed by TCBX and Merger Sub under this Agreement on or prior to the

Closing Date.

Section 7.03 Shareholder Approvals.

(a) Each of this Agreement and the Merger having been approved by the requisite vote of the holders of the outstanding shares

of Great Plains Stock as and to the extent required by the OGCA and the Great Plains Constituent Documents (the “Requisite Great Plains Vote”).

(b) The TCBX Share Issuance having been approved by the requisite vote of

the holders of the outstanding shares of TCBX Common Stock as and to the extent required by the TBOC, the TCBX Constituent Documents, and the rules of the NYSE (the “Requisite TCBX Vote”).

Section 7.04 Government and Other Approvals. Great Plains and TCBX having received approvals, acquiescences or consents of the

transactions contemplated by this Agreement from all necessary Governmental Entities and from the third parties listed on TCBX Confidential Schedule 2.03(f) and all applicable waiting periods having

expired. Further, the approvals and the transactions contemplated hereby not having been contested or threatened to be contested by any federal or state Governmental Entity or by any other third party by formal proceedings.

Section 7.05 No Litigation. No action having been taken, and no statute, rule, regulation or Order being promulgated, enacted,

entered, enforced or deemed applicable to this Agreement or the transactions contemplated hereby by any federal, state or foreign government or Governmental Entity or by any court, including the entry of a preliminary or permanent injunction, which,

if successful, would (a) make the Agreement or any other agreement contemplated hereby, or the transactions contemplated hereby or thereby illegal, invalid or unenforceable, (b) impose material limits on the ability of any party to this

Agreement to complete the Agreement or any other agreement contemplated hereby, or the transactions contemplated hereby or thereby, or (c) if the Agreement or any other agreement contemplated hereby, or the transactions contemplated hereby or

thereby are completed, subject Great Plains or any officer, director, shareholder or employee of Great Plains to criminal or civil liability. Further, no action or proceeding before any court or Governmental Entity, by any government or Governmental

Entity or by any other Person is threatened, instituted or pending that would reasonably be expected to result in any of the consequences referred to in clauses (a) through (c) above.

Section 7.06 Delivery of Closing Documents. Great Plains shall have received all documents required to be received from TCBX and

Merger Sub on or prior to the Closing Date as set forth in Section 2.03 hereof, all in form and substance reasonably satisfactory to Great Plains.

Section 7.07 No Material Adverse Change. There having been no Material Adverse Change with respect to TCBX or TCB since

December 31, 2025.

Section 7.08 Registration Statement. The Registration Statement, including any amendments or

supplements thereto, shall be effective under the Securities Act and no stop order suspending the effectiveness of the Registration Statement shall be in effect or proceedings for such purpose pending before or threatened by the SEC. All state

securities permits or approvals required by applicable state securities Laws to consummate the transactions contemplated by this Agreement shall have been received and remain in effect.

Section 7.09 NYSE Listing. The shares of TCBX Common Stock to be issued pursuant to this Agreement shall have been approved for

listing on the NYSE.

Section 7.10 Federal Tax Opinion. Great Plains shall have received an opinion of

Fenimore Kay Harrison LLP, in form and substance reasonably satisfactory to Great Plains, dated as of the Closing Date, and based on facts, representations and assumptions described in such opinion, to the effect that the Integrated Mergers will

together be treated as an integrated transaction that qualifies as a “reorganization” within the meaning of Section 368(a) of the Code (the “FKH Tax Opinion”). In rendering the FKH Tax Opinion, counsel to Great

Plains may require and rely upon and may incorporate by reference representations and covenants, including those contained in the Great Plains Certificate and the TCBX Certificate referred to in Section 5.24 and

Section 6.16, respectively, and such other information reasonably requested by and provided to it by Great Plains or TCBX for purposes of rendering such FKH Tax Opinion.

ARTICLE VIII

CONDITIONS PRECEDENT TO THE OBLIGATIONS OF TCBX AND MERGER SUB

All obligations of TCBX and Merger Sub under this Agreement are subject to the satisfaction, prior to or at the Closing, of each of the

following conditions, which may be waived in whole or in part by such parties.

Section 8.01 Representations and Warranties.

(i) Each of the representations and warranties of Great Plains set forth in Section 3.01, Section 3.02, Section 3.03 (other than inaccuracies that are de minimis in

amount and effect) and Section 3.14 and Section 3.42 shall be true and correct in all respects at and as of the date of this Agreement and at and as of the Closing Date as though made at and as of

the Closing Date (unless any such representation or warranty is made only as of a specific date, in which case as of such specific date) and (ii) each of the other representations and warranties made by Great Plains in this Agreement or in any

document or schedule delivered to TCBX in connection with this Agreement being true and correct in all material respects (except to the extent such representations and warranties are qualified by their terms by reference to “material,”

“materiality,” “in all material respects,” “Material Adverse Change,” or the like, in which case such representations and warranties as so qualified are true and correct in all respects) when made and being true

and correct in all material respects as of the Closing with the same force and effect as if such representations and warranties were made at and as of the Closing, except with respect to those representations and warranties specifically made as of

an earlier date (in which case such representations and warranties must have been true and correct as of such earlier date).

Section 8.02 Performance of Obligations. Great Plains has, or has caused to be, performed or observed, in all material respects,

all obligations and agreements required to be performed or observed by Great Plains under this Agreement on or prior to the Closing Date.

Section 8.03 Shareholder Approvals.

(a) Each of this Agreement and the Merger having been approved by the Requisite Great Plains Vote.

(b) The TCBX Share Issuance having been approved by the Requisite TCBX Vote.

Section 8.04 Government and Other Approvals. TCBX having received approvals, acquiescences or consents of the transactions

contemplated by this Agreement from all necessary Governmental Entities and from the third parties listed on Great Plains Confidential Schedule 2.02(i), and all applicable

waiting periods having expired. Further, the approvals and the transactions contemplated hereby not having been contested or threatened to be contested by any federal or state Governmental Entity or by any other third party by formal proceedings.

Section 8.05 No Litigation. No action having been taken, and no statute, rule,

regulation or Order being promulgated, enacted, entered, enforced or deemed applicable to this Agreement or the transactions contemplated hereby by any federal, state or foreign government or Governmental Entity or by any court, including the entry

of a preliminary or permanent injunction, which, if successful, would (a) make the Agreement or any other agreement contemplated hereby, or the transactions contemplated hereby or thereby illegal, invalid or unenforceable, (b) require the

divestiture of a material portion of the assets of TCBX or its Subsidiaries, (c) impose material limits on the ability of any party to this Agreement to complete the Agreement or any other agreement contemplated hereby, or the transactions

contemplated hereby or thereby, or (d) if the Agreement or any other agreement contemplated hereby, or the transactions contemplated hereby or thereby are completed, subject TCBX, TCB or any officer, director, shareholder or employee of TCBX or

TCB to criminal or civil liability. Further, no action or proceeding before any court or Governmental Entity, by any government or Governmental Entity or by any other Person is threatened, instituted or pending that would reasonably be expected to

result in any of the consequences referred to in clauses (a) through (d) above.

Section 8.06 Releases. TCBX having

received from each of the directors of Great Plains and the Bank an instrument dated as of the Closing Date releasing Great Plains, its Subsidiaries and each of its Affiliates, successors and assigns, from any and all claims of such directors

(except as to certain matters described therein), the form of which is attached as Exhibit “D”. Further, TCBX having received from each of the officers of Great Plains and the Bank, as listed on

Great Plains Confidential Schedule 8.06, an instrument dated as of the Closing Date releasing Great Plains, its Subsidiaries and each of its Affiliates,

successors and assigns, from any and all claims of such officers (except as to certain matters described therein), the form of which is attached as Exhibit “E”. Further, TCBX having received an

executed Deferred Compensation Plan Release from each of the participants listed on TCBX Confidential Schedule 8.06 and copies of all other executed Deferred Compensation Plan Releases obtained by Great Plains in accordance with

Section 1.11(b).

Section 8.07 No Material Adverse Change. There will have been no Material Adverse

Change with respect to Great Plains or any of its Subsidiaries since December 31, 2025.

Section 8.08 Termination of Employee

Plans. TCBX having received evidence reasonably satisfactory to TCBX that, as of the day that is one day prior to the Closing Date, all Employee Plans of Great Plains (other than such plans TCBX elects not to terminate) have been terminated in

accordance with the terms of such Employee Plans of Great Plains, the Code, ERISA and all other applicable Laws on a basis satisfactory to TCBX in its reasonable discretion and that, to the extent required by the Employee Plans or applicable Law,

affected participants have been notified of such terminations and/or integrations.

Section 8.09 Employment Agreements. Each

of the persons set forth on TCBX Confidential Schedule 8.09 shall have entered into an employment agreement with TCBX and/or TCB and such agreements shall remain in full force and effect.

Section 8.10 Registration Statement. The Registration Statement, including any

amendments or supplements thereto, shall be effective under the Securities Act and no stop order suspending the effectiveness of the Registration Statement shall be in effect or proceedings for such purpose pending before or threatened by the SEC.

All state securities permits or approvals required by applicable state securities Laws to consummate the transactions contemplated by this Agreement shall have been received and remain in effect.

Section 8.11 Dissenting Shareholders. Holders of not more than 5% of the outstanding shares of Great Plains Stock having demanded

or be entitled to demand payment of the fair value of their shares as dissenting shareholders under applicable provisions of the OGCA.

Section 8.12 Delivery of Closing Documents. TCBX shall have received all documents required to be received from Great Plains on or

prior to the Closing Date as set forth in Section 2.02 hereof, all in form and substance reasonably satisfactory to TCBX.

Section 8.13 Minimum Adjusted Equity. Great Plains’ Adjusted Equity shall be equal to or greater than $141,300,000.

Section 8.14 FIRPTA Certificate. Great Plains shall have delivered to TCBX the following documents, each duly executed and

completed by Great Plains, dated as of the Closing Date and in form and substance reasonably satisfactory to TCBX: (a) a notice to the IRS conforming to the requirements of Treasury Regulation Section 1.897-2(h)(2), and (b) a

Statement of Non-U.S. Real Property Holding Corporation Status Pursuant to Treasury Regulation Sections 1.1445-2(c)(3) and 1.897-2(h) (collectively, the “FIRPTA

Certificate”).

Section 8.15 Federal Tax Opinion. TCBX shall have received (a) an opinion of Norton Rose

Fulbright US LLP, in form and substance reasonably satisfactory to TCBX, dated as of the Closing Date, and based on facts, representations and assumptions described in such opinion, to the effect that the Integrated Mergers will together be treated

as an integrated transaction that qualifies as a “reorganization” within the meaning of Section 368(a) of the Code, and (b) a copy of the FKH Tax Opinion. In rendering such opinion, counsel to TCBX may require and rely upon and

may incorporate by reference representations and covenants, including those contained in the Great Plains Certificate and the TCBX Certificate referred to in Section 5.24 and Section 6.16,

respectively, and such other information reasonably requested by and provided to it by Great Plains or TCBX for purposes of rendering such opinion.

Section 8.16 Tail Policy. Great Plains shall have procured the Tail Policy in accordance with the terms and subject to the

conditions of Section 5.23(c).

Section 8.17 Payoff Documentation. TCBX shall have received the

Payoff Documentation at least two (2) Business Days prior to the Closing.

ARTICLE IX

TERMINATION

Section 9.01 Right of Termination. This Agreement and the transactions contemplated hereby may be terminated at any time,

notwithstanding the approval thereof by the shareholders of Great Plains, prior to the Effective Time as follows, and in no other manner:

(a) by the mutual written consent of TCBX and Great Plains;

(b) by either Great Plains or TCBX (as long as the terminating party is not in material breach of any representation, warranty,

covenant or other agreement contained herein) if the conditions precedent to such parties’ obligations to close specified in ARTICLE VII and ARTICLE VIII, respectively, hereof have not been

met or waived by September 30, 2027; provided, that such date may be extended to such later date as agreed upon by the parties hereto;

(c) by either TCBX or Great Plains if any of the transactions contemplated by this Agreement are disapproved by any Regulatory

Agency whose approval is required to complete such transactions or if any court of competent jurisdiction in the United States or other federal or state governmental body has issued an Order, decree or ruling or taken any other action restraining,

enjoining, invalidating or otherwise prohibiting the Agreement or the transactions contemplated hereby and such disapproval, Order, decree, ruling or other action is final and nonappealable; provided, however, that the party seeking to terminate

this Agreement pursuant to this Section 9.01(c) shall have used its commercially reasonable efforts to contest, appeal and remove such order, decree, ruling or other action;

(d) by either TCBX or Great Plains if there has been any Material Adverse Change with respect to the other party;

(e) by TCBX, if there shall have been a breach of any of the covenants or agreements or any of the representations or

warranties (or any such representation or warranty shall cease to be true and correct) set forth in this Agreement on the part of Great Plains or any other agreement contemplated hereby, which breach or failure to be true and correct, either

individually or in the aggregate with all other breaches (or failures of such representations and warranties to be true and correct), would constitute, if occurring or continuing on the Closing Date, the failure of the conditions set forth in

Section 8.01 or Section 8.02, as the case may be; provided, that the right to terminate this Agreement under this Section 9.01(e) shall not be available to TCBX if it or

Merger Sub is then in material breach of any of its representations, warranties, covenants or agreements set forth in this Agreement. If TCBX desires to terminate this Agreement because of an alleged breach or inaccuracy as provided in this

Section 9.01(e), then it must notify Great Plains in writing of its intent to terminate stating the reason therefor. Great Plains shall have thirty (30) days from the receipt of such notice to cure the alleged breach

or failure to be true and correct, if the breach or failure to be true and correct is capable of being cured;

(f) by Great Plains, if there shall have been a breach of any of the

covenants or agreements or any of the representations or warranties (or any such representation or warranty shall cease to be true and correct) set forth in this Agreement on the part of TCBX or any other agreement contemplated hereby, which breach

or failure to be true and correct, either individually or in the aggregate with all other breaches (or failures of such representations and warranties to be true and correct), would constitute, if occurring or continuing on the Closing Date, the

failure of the conditions set forth in Section 7.01 or Section 7.02, as the case may be; provided, that the right to terminate this Agreement under this Section 9.01(f)

shall not be available to Great Plains if it is then in material breach of any of its representations, warranties, covenants or agreements set forth in this Agreement. If Great Plains desires to terminate this Agreement because of an alleged breach

or failure to be true and correct as provided in this Section 9.01(f), then it must notify TCBX in writing of its intent to terminate stating the reason therefor. TCBX shall have thirty (30) days from the receipt of

such notice to cure the alleged breach or failure to be true and correct, if the breach or failure to be true and correct is capable of being cured;

(g) by TCBX or Great Plains, if this Agreement and the Merger are not approved by the Requisite Great Plains Vote at the Great

Plains Shareholders’ Meeting or the TCBX Share Issuance is not approved by the Requisite TCBX Vote at the TCBX Shareholders’ Meeting, or, in each case, at any adjournment or postponement thereof; provided, however, that neither Great

Plains nor TCBX may terminate this Agreement pursuant to this Section 9.01(g) if such party has breached in any material respect any of its obligations under this Agreement, in each case in a manner that caused the failure

to obtain the approval of the Great Plains shareholders at the Great Plains Shareholders’ Meeting or the approval of the TCBX shareholders at the TCBX Shareholders’ Meeting, or, in each case, at any adjournment or postponement thereof;

(h) by Great Plains prior to obtaining the approval of the Great Plains shareholders at the Great Plains

Shareholders’ Meeting, and subject to the terms and conditions of Section 5.22(e), in order to accept a Superior Proposal;

(i) by TCBX if the Great Plains Board shall have effected a Change in Recommendation;

(j) by TCBX if Great Plains or the Bank enter into any formal or informal administrative action with a Governmental Entity or

any such action is threatened by a Governmental Entity; provided, that, in the case of any informal administrative action, whether entered into or threatened, such action is reasonably likely to result in a Material Adverse Change with respect to

Great Plains; or

(k) by Great Plains if TCBX or TCB enter into any formal or informal administrative action with a

Governmental Entity or any such action is threatened by a Governmental Entity.

Section 9.02 Notice of Termination. The power

of termination provided for by Section 9.01 hereof may be exercised only by a notice given in writing, as provided in Section 10.08 of this Agreement.

Section 9.03 Effect of Termination.

(a) If this Agreement is terminated pursuant to the provisions of Section 9.01 hereof, then no party

to this Agreement will have any further liability or obligation under this Agreement; provided, however, that:

(i) no such

termination shall relieve any party hereto of any liability or damages resulting from any willful breach of this Agreement or actual fraud;

(ii) the provisions of this Section 9.03, and ARTICLE X (other than

Section 10.06) shall survive any such termination; and

(iii) the Confidentiality Agreement shall

survive any such termination in accordance with its terms.

(b) If TCBX is not in material breach of any covenant or

obligation under this Agreement, Great Plains shall pay to TCBX, by wire transfer of same day funds, a termination fee equal to $11,981,827 (the “Termination Fee”), if this Agreement is terminated:

(i) by Great Plains pursuant to Section 9.01(h);

(ii) by TCBX pursuant to Section 9.01(i);

(iii) by TCBX or Great Plains pursuant to Section 9.01(b) (if Great Plains shall have failed to

obtain the Requisite Great Plains Vote at the duly convened Great Plains Shareholders’ Meeting or any adjournment or postponement thereof at which a vote on the adoption of this Agreement was taken) or by TCBX pursuant to

Section 9.01(e), in either case only if:

(A) after the date of this Agreement and prior to the

termination of this Agreement, a bona fide Acquisition Proposal shall have been made known to senior management of Great Plains, the Great Plains Board or directly to Great Plains’ shareholders generally or any Person shall have publicly

announced (and not withdrawn) an Acquisition Proposal with respect to Great Plains; and

(B) prior to the date that is

twelve (12) months after the date of such termination, Great Plains enters into a definitive agreement or consummates a transaction with respect to an Acquisition Proposal (whether or not the same Acquisition Proposal as that referred to

above), provided, that, solely for the purposes of this Section 9.03(b)(iii), the term “Acquisition Proposal” shall have the meaning ascribed thereto in Section 10.12, except

that all references in such definition to 15% shall be changed to 50%.

Section 9.03(b) shall be paid:

(i) on the date of termination, if paid pursuant to

Section 9.03(b)(i);

(ii) within two (2) Business Days of termination, if paid pursuant to

Section 9.03(b)(ii); and

(iii) on the earlier of the date Great Plains enters into the

definitive agreement described in Section 9.03(b)(iii)(B) and the date Great Plains consummates the transaction described in Section 9.03(b)(iii)(B), if paid pursuant to

Section 9.03(b)(iii).

(d) Each of the parties hereto acknowledges and hereby agrees that the

provisions of Section 9.03(b) are an integral part of the transactions contemplated by this Agreement, that such amounts do not constitute a penalty, and that, without such provisions, the parties would not have entered

into this Agreement. If Great Plains shall fail to pay in a timely manner any amount due to TCBX pursuant to this Section 9.03, then Great Plains (i) shall pay to TCBX the reasonable costs and expenses of TCBX

(including its reasonable, documented attorneys’ fees and expenses) incurred or accrued in connection with TCBX’s efforts to obtain payment of any amounts due to TCBX and (ii) shall pay all interest accrued on any amount due to TCBX

pursuant to this Section 9.03, which shall accrue at the prime lending rate prevailing during such period as published in The Wall Street Journal. Any interest payable hereunder shall be calculated on a daily basis from the

date such amounts were required to be paid until (but excluding) the date of actual payment, and on the basis of a 360-day year.

(e) The fees described in this Section 9.03 shall be the exclusive remedy for a termination of the

Agreement as specified in Section 9.03(b) and shall be in lieu of damages incurred in the event of any such termination of this Agreement.

ARTICLE X

GENERAL

PROVISIONS

Section 10.01 Nonsurvival of Representations, Warranties, Covenants and Agreements. The representations,

warranties, covenants and agreements (other than the Confidentiality Agreement, which shall survive in accordance with its terms) of the parties hereto contained in this Agreement shall terminate at the Closing, other than the covenants that by

their terms are to be performed after the Effective Time, which shall survive the Closing.

Section 10.02 Expenses. Except

(i) with respect to costs and expenses of printing and mailing the Joint Proxy Statement/Prospectus and all filing and other fees paid to the SEC in connection with the Merger, which shall be borne equally by TCBX and Great Plains, and

(ii) as otherwise provided in Section 9.03, all fees and expenses incurred in connection with this Agreement and the transactions contemplated hereby shall be paid by the party incurring such fees or expenses, whether

or not the Merger is consummated.

Section 10.03 Brokerage Fees and Commissions.

(a) Except as set forth on TCBX Confidential Schedule 10.03(a), TCBX hereby

represents to Great Plains that no agent, representative or broker has represented TCBX in connection with the transactions described in this Agreement. Great Plains will not have any responsibility or liability for any fees, expenses or commissions

payable to any agent, representative or broker of TCBX and TCBX hereby agrees to indemnify and hold Great Plains harmless for any amounts owed to any agent, representative or broker of TCBX.

(b) Except as set forth on Great Plains Confidential

Schedule 10.03(b), Great Plains hereby represents to TCBX that no agent, representative or broker has represented Great Plains in connection with the transactions described in this Agreement. TCBX will not

have any responsibility or liability for any fees, expenses or commissions payable to any agent, representative or broker of Great Plains or any shareholder of Great Plains, and Great Plains hereby agrees to indemnify and hold TCBX harmless for any

amounts owed to any agent, representative or broker of Great Plains or any shareholder of Great Plains.

Section 10.04 Entire

Agreement. This Agreement, the Voting Agreement, the Director Support Agreements, the TCBX Confidential Schedules, the Great Plains Confidential Schedules, the Confidentiality Agreement and the other agreements, documents, schedules and

instruments signed and delivered by the parties to each other at the Closing are the full understanding of the parties, a complete allocation of risks between them and a complete and exclusive statement of the terms and conditions of their agreement

relating to the subject matter hereof and supersede any and all prior agreements, whether written or oral, that may exist between the parties with respect thereto. Except as otherwise specifically provided in this Agreement, no conditions, usage of

trade, course of dealing or performance, understanding or agreement purporting to modify, vary, explain or supplement the terms or conditions of this Agreement is binding unless hereafter made in writing and signed by the party to be bound, and no

modification will be effected by the acknowledgment or acceptance of documents containing terms or conditions at variance with or in addition to those set forth in this Agreement.

Section 10.05 Binding Effect; Assignment. All of the terms, covenants, representations, warranties and conditions of this

Agreement are binding upon, and inure to the benefit of and are enforceable by, the parties and their respective successors, representatives and permitted assigns. No party to this Agreement may assign this Agreement, by operation of law or

otherwise, in whole or in part, without the prior written consent of the other parties, and any purported assignment made or attempted in violation of this Section 10.05 shall be null and void.

Section 10.06 Further Cooperation. The parties agree that they will, at any time and from time to time after the Closing, upon

request by the other and without further consideration, do, perform, execute, acknowledge and deliver all such further acts, deeds, assignments, assumptions, transfers, conveyances, powers of attorney, certificates and assurances as may be

reasonably required in order to complete the transactions contemplated by this Agreement or to carry out and perform any undertaking made by the parties hereunder.

Section 10.07 Severability. Whenever possible, each provision or portion of any

provision of this Agreement shall be interpreted in such manner as to be effective and valid under applicable Law, but if any provision of this Agreement is held to be illegal, invalid or unenforceable under present or future Laws, then the

remaining provisions of this Agreement will remain in full force and effect and will not be affected by such illegal, invalid or unenforceable provision or by its severance from this Agreement; and this Agreement shall be reformed, construed and

enforced in such jurisdiction such that the illegal, invalid or unenforceable provision or portion thereof shall be interpreted to be only so broad as is enforceable.

Section 10.08 Notices. Any and all payments (other than payments at the Closing), notices, requests, instructions and other

communications required or permitted to be given under this Agreement after the date of this Agreement by any party hereto to any other party may be delivered personally or by nationally recognized overnight courier service or sent by U.S. mail or

(except in the case of payments) by email (provided that the email is promptly confirmed by telephone and is followed up within one (1) Business Day by dispatch pursuant to one of the other methods described herein), at the respective addresses

set forth below and is deemed delivered (a) in the case of personal delivery or email, when received; (b) in the case of mail, upon the earlier of actual receipt or five (5) Business Days after deposit in the United States Postal

Service, first class certified or registered mail, postage prepaid, return receipt requested; and (c) in the case of an overnight courier service, one (1) Business Day after delivery to such courier service with instructions for overnight

delivery. The parties may change their respective addresses and email addresses by written notice to all other parties, sent as provided in this Section 10.08. All communications must be in writing and addressed as follows:

If to Great Plains:

Todd

Taylor

Chairman of the Board

Great Plains Bancshares, Inc.

2017 West Third Street

Elk City,

Oklahoma 73664

Email: [***]

With a copy (which shall not constitute notice) to:

Chet A. Fenimore, Esq.

Fenimore

Kay Harrison LLP

805 Las Cimas Parkway, Suite 350

Austin, Texas 78746

Email:

cfenimore@fkhpartners.com

If to TCBX:

Bart O. Caraway

Chairman,

President and Chief Executive Officer

Third Coast Bancshares, Inc.

20202 Highway 59 North, Suite 190

Humble, Texas 77338

Email: [***]

With a copy (which shall not constitute notice) to:

Michael G. Keeley, Esq.

Norton

Rose Fulbright US LLP

2200 Ross Avenue, Suite 3600

Dallas, Texas 75201-7932

Email:

mike.keeley@nortonrosefulbright.com

Section 10.09 GOVERNING LAW. THIS AGREEMENT IS TO BE CONSTRUED IN ACCORDANCE WITH AND

GOVERNED BY THE LAWS OF THE STATE OF TEXAS, WITHOUT REGARD FOR THE PROVISIONS THEREOF REGARDING CHOICE OF LAW THAT WOULD APPLY THE LAW OF A DIFFERENT JURISDICTION. VENUE FOR ANY CAUSE OF ACTION BETWEEN THE PARTIES TO THIS AGREEMENT WILL LIE IN

DALLAS COUNTY, TEXAS.

Section 10.10 WAIVER OF JURY TRIAL. EACH PARTY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY

ARISE UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT SUCH PARTY MAY HAVE TO A

TRIAL BY JURY IN RESPECT OF ANY SUIT, ACTION OR OTHER PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT: (A) NO

REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF ANY ACTION, SUIT OR PROCEEDING, SEEK TO ENFORCE THE FOREGOING WAIVER, (B) EACH PARTY UNDERSTANDS AND

HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (C) EACH PARTY MAKES THIS WAIVER VOLUNTARILY, AND (D) EACH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS

SECTION 10.10.

Section 10.11 Multiple Counterparts. For the convenience of the parties hereto, this

Agreement may be signed in multiple counterparts, each of which will be deemed an original, and all counterparts hereof so signed by the parties hereto, whether or not such counterpart will bear the execution of each of the parties hereto, will be

deemed to be, and is to be construed as, one and the same Agreement. A facsimile or electronic scan in “PDF” format of a signed counterpart of this Agreement will be sufficient to bind the party or parties whose signature(s) appear

thereon.

Section 10.12 Definitions. For purposes of this Agreement, the following terms have the meanings specified or

referred to in this Section 10.12:

“Acquisition Proposal” means, other than

the transactions contemplated by this Agreement, any offer, proposal or inquiry relating to, or any third party indication of interest in, (i) any acquisition or purchase, direct or indirect, of 15% or more of the consolidated assets of Great

Plains and its Subsidiaries or 15% or more of any class of

equity or voting securities of Great Plains or its Subsidiaries whose assets, individually or in the aggregate, constitute more than 15% of the consolidated assets of Great Plains, (ii) any

tender offer (including a self-tender offer) or exchange offer that, if consummated, would result in such third party beneficially owning 15% or more of any class of equity or voting securities of Great Plains or its Subsidiaries whose assets,

individually or in the aggregate, constitute more than 15% of the consolidated assets of Great Plains, or (iii) a merger, consolidation, share exchange, business combination, reorganization, recapitalization, liquidation, dissolution or other

similar transaction involving Great Plains or its Subsidiaries whose assets, individually or in the aggregate, constitute more than 15% of the consolidated assets of Great Plains.

“Adjusted Equity” shall have the meaning set forth in Section 1.06(a)(i).

“Affiliate” means any Person that, directly or indirectly, through one or more intermediaries, (a) owns

or controls another Person, (b) is owned or controlled by another Person, or (c) is under common control or ownership with another Person, and ownership means the direct or indirect beneficial ownership of more than fifty percent (50%) of

the equity securities of a Person, or, in the case of a Person that is not a corporation, more than fifty percent (50%) of the voting and/or equity interest.

“Aggregate Adjusted Consideration” shall have the meaning set forth in

Section 1.06(a)(ii).

“Agreement” shall have the meaning set forth in the

preamble.

“Bankruptcy Exception” means, in respect of any agreement, contract, commitment or

obligation, any limitation thereon imposed by any bankruptcy, insolvency, fraudulent conveyance, reorganization, receivership, moratorium or similar Law affecting creditors’ rights and remedies generally and, with respect to the enforceability

of any agreement, contract, commitment or obligation, by general principles of equity, including principles of commercial reasonableness, good faith and fair dealing, regardless of whether enforcement is sought in a proceeding at Law or in equity.

“Bank” shall have the meaning set forth in the Recitals.

“Bank Merger” shall have the meaning set forth in the Recitals.

“Bank Merger Agreement” shall have the meaning set forth in Section 1.12.

“Bank Stock” shall have the meaning set forth in Section 3.03(b).

“BHCA” shall have the meaning set forth in the preamble.

“Business Day” means Monday through Friday of each week, except a legal holiday recognized as such by the

United States federal government or any day on which banking institutions in Humble, Texas are authorized or required by Law to be closed.

“Calculation Date” shall have the meaning set forth in Section 1.06(a)(iii).

“Calculation Time” shall have the meaning set forth in

Section 1.06(a)(iv).

“Call Reports” shall have the meaning set forth in

Section 3.05(b).

“Cancelled Shares” shall have the meaning set forth in

Section 1.05(d).

“Certificate” shall have the meaning set forth in

Section 1.07(c).

“Change in Recommendation” shall have the meaning set forth

in Section 5.22(d).

“Closing” shall have the meaning set forth in

Section 2.01(a).

“Closing Date” shall have the meaning set forth in

Section 2.01(a).

“Code” shall have the meaning set forth in the Recitals.

“Commencement Date” shall have the meaning set forth in Section 3.12(o).

“Confidentiality Agreement” means the Non-Disclosure and

Confidentiality Agreement, dated as of June 22, 2026, by and between Great Plains and TCBX.

“Continuing

Employee” shall have the meaning set forth in Section 6.08(a).

“Controlled

Group Plans” shall have the meaning set forth in Section 3.28(g).

“CRA” shall have the meaning set forth in Section 3.32.

“Deferred Compensation Plans” shall have the meaning set forth in Section 1.11(a).

“Deferred Compensation Plan Release” shall have the meaning set forth in

Section 1.11(b).

“Director Support Agreement” shall have the meaning set

forth in the Recitals.

“Dissenting Shares” shall have the meaning set forth in

Section 1.10(a).

“Dissenting Shareholder” shall have the meaning set forth in

Section 1.10(a).

“Dodd-Frank Act” shall have the meaning set forth in

Section 3.36.

“Effective Time” shall have the meaning set forth in

Section 2.01(b).

“Employee Plans” shall have the meaning set forth in

Section 3.28(a).

“Employment Agreements” shall have the meaning set forth in

Section 3.27(b).

“Environmental Inspections” shall have the meaning set forth

in Section 5.12(a).

“Environmental Laws” means the common Law and all

federal, state, local and foreign Laws or regulations, codes, Orders, decrees, judgments or injunctions issued, promulgated, approved or entered thereunder, now or hereafter in effect, relating to pollution or protection of human health and the

environment, including Laws relating to (i) emissions, discharges, releases or threatened releases of Hazardous Materials, into the environment (including ambient air, surface water, ground water, land surface or subsurface strata),

(ii) the manufacture, processing, distribution, use, generation, treatment, storage, disposal, transport or handling of Hazardous Materials, (iii) underground and above ground storage tanks, and related piping, and emissions, discharges,

releases or threatened releases therefrom, and (iv) the conservation of open space, ecosystems, wetlands or water of the United States or a state, and (v) the preservation of cultural or historic structures or artifacts.

“Equity Adjustment” shall have the meaning set forth in Section 1.06(a)(iv).

“Exchange Ratio” shall have the meaning set forth in Section 1.06(a)(v).

“ERISA” shall have the meaning set forth in Section 3.28(a).

“Exchange Act” means the Securities Exchange Act of 1934, as amended.

“Exchange Agent” shall have the meaning set forth in Section 1.07(a).

“Exchange Fund” shall have the meaning set forth in Section 1.07(b).

“Existing Indemnification Obligation” shall have the meaning set forth in

Section 5.23(a).

“FDIA” shall have the meaning set forth in

Section 3.01(b).

“FDIC” shall have the meaning set forth in

Section 3.08.

“Federal Reserve” means the Board of Governors of the Federal

Reserve System.

“FIRPTA Certificate” shall have the meaning set forth in

Section 8.14.

“FKH Tax Opinion” shall have the meaning set forth in

Section 7.10.

“GAAP” shall have the meaning set forth in

Section 1.06(a)(i).

“Governmental Entity” means any court, arbitrator,

administrative agency or commission, board, bureau or other governmental or Regulatory Agency or instrumentality.

“Hazardous Material” means any pollutant, contaminant, chemical, or toxic or hazardous substance,

constituent, material or waste, or any other chemical, substances, constituent or waste including, among others, asbestos, lead-based paint, urea-formaldehyde, petroleum, crude oil or any fraction thereof or any petroleum product.

“Indemnified Parties” shall have the meaning set forth in

Section 5.23(e).

“Integrated Mergers” shall have the meaning set forth in the

Recitals.

“IRS” shall have the meaning set forth in Section 1.06(a)(vii)(E).

“Joint Proxy Statement/Prospectus” shall have the meaning set forth in

Section 5.02(d).

“Great Plains” shall have the meaning set forth in the

preamble.

“Great Plains Board” shall have the meaning set forth in the Recitals.

“Great Plains Certificate” shall have the meaning set forth in Section 5.23.

“Great Plains Confidential Schedules” shall have the meaning set forth in the first paragraph of

ARTICLE III.

“Great Plains Constituent Documents” shall have the meaning set

forth in Section 3.04(a).

“Great Plains Equity” shall have the meaning set

forth in Section 1.06(a)(i).

“Great Plains Financial Statements” shall have

the meaning set forth in Section 3.05(a).

“Great Plains Loan Agreement” shall

mean collectively the Loan Agreement (Revolving Line of Credit), dated July 26, 2020, by and between Great Plains and TIB, National Association, together with the related loan and security documents, each as amended or otherwise modified.

“Great Plains Merger Costs” shall have the meaning set forth in

Section 1.06(a)(vii).

“Great Plains Recommendation” shall have the meaning

set forth in Section 3.02.

“Great Plains Shareholders’ Meeting” shall

have the meaning set forth in Section 5.02(a).

“Great Plains Stock” shall

have the meaning set forth in Section 1.05(b).

A person has “Knowledge” of,

or acts “Knowingly” with respect to, a particular fact or other matter if any of the following individuals, after reasonable inquiry, is actually aware of such fact or other matter: (a) with respect to Great Plains, Todd

Taylor, Paul M. Dickinson, Mark L. Russell, Terry Shelby, Barry Schwarz, James R. Mills, Trace R. Larman, Michael S. Boecking, and Brett A. Miller, and (b) with respect to TCBX, Bart O. Caraway, R. John McWhorter, Liz Eber, Audrey A. Spaulding,

William Bobbora, Christopher Peacock, and Laura Rau.

“Law” means any federal or state constitution, statute,

regulation, rule, or common law applicable to a Person.

“Leases” shall have the meaning set forth in

Section 3.11(a)(i).

“Leased Real Property” shall have the meaning set forth

in Section 3.09.

“Letter of Transmittal” shall have the meaning set forth in

Section 1.07(b).

“Lien(s)” means any mortgage, security interest, pledge,

charges, encumbrance or lien (statutory or otherwise).

“Listed Contracts” shall have the meaning set

forth in Section 3.11(a).

“Material Adverse Change” means, with respect to

any party hereto, any event, occurrence, fact, condition, effect or change that is, or would reasonably be expected to become, individually or in the aggregate, materially adverse to (a) the business, results of operations, condition (financial

or otherwise), assets, properties, liabilities (absolute, accrued, contingent or otherwise) or reserves of such party and its Subsidiaries, taken as a whole, or (b) the ability of such party to consummate the transactions contemplated hereby on

a timely basis; provided, however, that none of the following shall constitute, or shall be considered in determining whether there has occurred, and no event, circumstance, change or effect resulting from or arising out of any of the following

shall constitute, a Material Adverse Change: (i) any changes in Laws or interpretations thereof that are generally applicable to the banking or savings industries; (ii) changes in GAAP or RAP that are generally applicable to the banking or

savings industries; (iii) expenses incurred in connection with the transactions contemplated by this Agreement; (iv) changes in global, national or regional political conditions or general economic or market conditions in the United States

or the States of Texas and Oklahoma, including changes in prevailing interest rates, credit availability and liquidity, currency exchange rates, and price levels or trading volumes in the United States or foreign securities markets affecting other

companies in the financial services industry; (v) general changes in the credit markets or general downgrades in the credit markets; (vi) actions or omissions of a party taken as required by this Agreement or with the prior informed

written consent of the other party or parties in contemplation of the transactions contemplated by this Agreement; (vii) any natural or man-made disaster, acts of god, outbreak of any disease, pandemic or

other public health event, any outbreak or escalation of hostilities, declared or undeclared acts of war or terrorism; or (viii) the announcement of the transactions contemplated by this Agreement; provided, that with respect to

clauses (i), (ii), (iv), (v) and (vii), such party is not disproportionately adversely affected relative to other Persons, bank holding companies or insured depository institutions operating in the industry in which such party operates.

“Merger” shall have the meaning set forth in the Recitals.

“Merger Consideration” shall have the meaning set forth in Section 1.05(b).

“Merger Sub” shall have the meaning set forth in the preamble.

“Minimum Adjusted Equity” shall have the meaning set

forth in Section 1.06(a)(viii).

“Nonqualified Deferred Compensation Plan”

shall have the meaning set forth in Section 3.28(k).

“NYSE” shall have the

meaning set forth in Section 3.08.

“OCC” means the Office of the Comptroller

of the Currency.

“OGCA” shall have the meaning set forth in Section 1.01.

“Order” means any award, decision, decree, injunction, judgment, order, ruling, or verdict entered,

issued, made or rendered by any court, administrative agency or any other Governmental Entity.

“OREO

Property” shall have the meaning set forth in Section 3.09.

“Owned Real

Property” shall have the meaning set forth in Section 3.09.

“Payoff

Documentation” shall mean, with respect to the Great Plains Loan Agreement, (1) a payoff letter in form and substance reasonably satisfactory to TCBX, providing for (x) the payoff, discharge and termination in full on the Closing

Date of all indebtedness and commitments in connection with the Great Plains Loan Agreement (except for customary surviving obligations) and (y) the release of any Liens and termination of all guarantees supporting such indebtedness and

commitments substantially contemporaneously with the Closing on the Closing Date and (2) customary lien and guarantee release documents reasonably satisfactory to TCBX with respect to the liens and guarantees under the Great Plains Loan

Agreement.

“Permitted Encumbrances” means only (i) Liens for Taxes not yet due and payable and

that do not constitute penalties or Taxes being contested in good faith by appropriate Tax Proceedings, in each case, only to the extent that adequate reserves for such Taxes are recorded and maintained in accordance with GAAP, (ii) statutory

Liens of landlords, (iii) Liens of carriers, warehousemen, mechanics, materialmen and repairmen incurred in the ordinary course of business consistent with past practice and not yet delinquent, and (iv) zoning, building, or other

restrictions, variances, covenants, rights of way, rights of subtenants, encumbrances, easements and other minor irregularities in title, none of which, individually or in the aggregate, interfere in any material respect with the present use of or

occupancy of the affected parcel by the Bank, or have a material detrimental effect on the value thereof or its present use.

“Per Share Merger Consideration” shall have the meaning set forth in

Section 1.05(b).

“Person” means an individual, a partnership, a corporation,

a limited liability company, an association, a joint stock company, a trust, a joint venture, an unincorporated organization, any other business entity, or a governmental entity (or any department, agency, or political subdivision thereof).

“Property” or “Properties” shall

include all real property currently owned or leased by Great Plains or any of its Subsidiaries, including all Owned Real Property, OREO Property and Leased Real Property, as well as the premises and all improvements and fixtures thereon of Great

Plains or any of its Subsidiaries.

“Proprietary Rights” shall have the meaning set forth in

Section 3.15.

“RAP” shall have the meaning set forth in

Section 3.05(b).

“Registration Statement” shall have the meaning set forth in

Section 5.13(a).

“Regulatory Agency” means (i) any self-regulatory

organization, (ii) the Federal Reserve, (iii) the FDIC, (iv) the TDB, (v) the OCC, (vi) the SEC, or (vii) any other federal or state governmental or regulatory agency or authority having or claiming jurisdiction over a

party to this Agreement or the transactions contemplated hereby.

“Requisite Great Plains Vote” shall

have the meaning set forth in Section 7.03(a).

“Retirement Plan” shall have

the meaning set forth in Section 5.14(a).

“SEC” shall have the meaning set

forth in Section 3.37.

“Secondary Investigation” shall have the meaning set

forth in Section 5.12(a).

“Second Certificate of Merger” shall have the

meaning set forth in Section 1.12.

“Second Effective Time” shall have the

meaning set forth in Section 1.12.

“Second Step Merger” shall have the

meaning set forth in the Recitals.

“Securities Act” means the Securities Act of 1933, as amended.

“Series A Preferred Stock” shall have the meaning set forth in

Section 1.05(a).

“Series B Preferred Stock” shall have the

meaning set forth in Section 1.05(a).

“Share Adjustment” shall have the

meaning set forth in Section 1.05(f).

“Shareholders’ Representative”

shall have the meaning set forth in Section 5.18(c).

“SOA” shall have the

meaning set forth in Section 5.20(b).

“Subsidiary” means, when used with

reference to an entity, any corporation, a majority of the outstanding voting securities of which are owned directly or indirectly by such entity or any partnership, joint venture or other enterprise in which any entity has, directly or indirectly,

a majority equity interest.

“Superior Proposal” means any bona fide written

Acquisition Proposal received after the date hereof that the Great Plains Board determines in good faith, after consultation with its outside legal and financial advisors, to be reasonably likely to be consummated in accordance with its terms and to

be more favorable to Great Plains and its shareholders from a financial point of view than the transactions contemplated hereby (including any adjustment to the terms and conditions proposed by TCBX in response to such proposal pursuant to

Section 5.22(e) or otherwise); provided that for purposes of this definition references to “15%” in the definition of “Acquisition Proposal” shall be deemed to be references to “50%”.

“Surviving Corporation” shall have the meaning set forth in Section 1.01.

“Tail Policy” shall have the meaning set forth in Section 5.23(c).

“Tax” or “Taxes” means all (i) United States federal, state or local or non-United States taxes, assessments, charges, duties, tariffs, levies, fees or other similar governmental charges of any nature, including all income, franchise, profits, capital gains, capital stock, transfer,

sales, use, occupation, property, excise, escheat, abandoned or unclaimed property, severance, windfall profits, stamp, stamp duty reserve, license, payroll, withholding, ad valorem, value added, alternative minimum, environmental, customs, social

security (or similar), unemployment, sick pay, disability, registration and other taxes, assessments, charges, duties, tariffs, fees and other governmental charges of any kind whatsoever, whether disputed or not, together with all estimated taxes,

deficiency assessments, additions to tax, charges, levies, penalties and interest; (ii) any liability for the payment of any amount of a type described in clause (i) arising as a result of being or having been a member of any affiliated,

consolidated, combined, unitary or other similar group or being or having been included or required to be included in any Tax Return related thereto; and (iii) any liability for the payment of any amount of a type described in clause

(i) or clause (ii) as a result of any obligation to indemnify or otherwise assume or succeed to the liability of any other Person.

“Tax Proceeding” shall have the meaning set forth in Section 3.12(c).

“Tax Return” means any return, declaration, report, form, notice, election, claim for refund, or information

return or statement filed or required to be filed with any Governmental Entity with respect to any Tax, including any schedule, exhibit or attachment thereto, and including any amendment thereof (in each case, whether in written, electronic or other

form).

“TBOC” shall have the meaning set forth in Section 1.12.

“TCB” shall have the meaning set forth in the Recitals.

“TCBX” shall have the meaning set forth in the preamble.

“TCBX Board” shall have the meaning set forth in the Recitals.

“TCBX Certificate” shall have the meaning set forth in Section 6.17.

“TCBX Closing VWAP” means the volume-weighted average

price per share of TCBX Common Stock for a twenty (20) trading day period, starting with the opening of trading on the twentieth (20th) trading day prior to the Calculation Date to the closing of trading on the first (1st) trading day prior to

the Calculation Date, rounded to the nearest cent, as reported by Bloomberg Finance L.P.

“TCBX Common

Stock” shall have the meaning set forth in Section 1.05(a).

“TCBX

Confidential Schedules” shall have the meaning set forth in the first paragraph of ARTICLE IV.

“TCBX Constituent Documents” shall have the meaning set forth in Section 4.05(b).

“TCBX Loan Representative” means Audrey A. Spaulding (having an email address of [***]) or her

designee(s).

“TCBX Non-Voting Common Stock” shall have the

meaning set forth in Section 1.05(a).

“TCBX SEC Reports” shall have the

meaning set forth in Section 4.04(a).

“TCBX Shareholders’ Meeting”

shall have the meaning set forth in Section 6.02(a).

“TCBX Share Issuance”

means the issuance of shares of TCBX Common Stock in connection with the Merger.

“TDB” means the Texas

Department of Banking.

“Terminated Employee” shall have the meaning set forth in

Section 6.08(a).

“Termination Fee” shall have the meaning set forth in

Section 9.03(b).

“Transfer Taxes” shall have the meaning set forth in

Section 5.18(a).

“Treasury Regulations” means the regulations promulgated by

the United States Department of the Treasury pursuant to and in respect of provisions of the Code. All references herein to sections of the Treasury Regulations shall include any corresponding provision or provisions of succeeding, similar,

substitute proposed or final Treasury Regulations.

“Voting Agreement” shall have the meaning set forth

in the Recitals.

“Welfare Plan” shall have the meaning set forth in

Section 5.14(b).

Section 10.13 Specific Performance. Each of the parties hereto acknowledges that

the other parties would be irreparably damaged and would not have an adequate remedy at Law for money damages if any of the covenants contained in this Agreement were not performed in accordance with its terms or otherwise were materially breached.

Each of the parties hereto therefore agrees that, without the necessity of proving actual damages or posting bond or other security, the other party will be entitled to temporary and/or permanent injunction or injunctions which a court of competent

jurisdiction concludes is justified to prevent breaches of such performance and to specific enforcement of such covenants in addition to any other remedy to which they may be entitled, at Law or in equity.

Section 10.14 Attorneys’ Fees and Costs. If attorneys’ fees or other costs are incurred to secure

performance of any of the obligations herein provided for, or to establish damages for the breach thereof, or to obtain any other appropriate relief, the prevailing party is entitled to recover reasonable attorneys’ fees and costs incurred

therein and determined by the court to be justified.

Section 10.15 Rules of Construction. Whenever the words

“include,” “includes” or “including” are used in this Agreement, they are deemed to be followed by the words “without limitation.” The words “hereof,” “herein” and

“hereunder” and words of similar import when used in this Agreement refer to this Agreement as a whole and not to any particular provision in this Agreement. Each use herein of the masculine, neuter or feminine gender is deemed to

include the other genders. Each use herein of the plural includes the singular and vice versa, in each case as the context requires or as is otherwise appropriate. The word “or” is used in the inclusive sense. Any agreement or instrument

defined or referred to herein or in any agreement or instrument that is referred to herein means such agreement or instrument as from time to time amended, modified or supplemented, including by waiver or consent. References to a Person are also to

its permitted successors or assigns. In the event that an ambiguity or a question of intent or interpretation arises, this Agreement shall be construed as if drafted jointly by the parties, and no presumption or burden of proof shall arise favoring

or disfavoring any party by virtue of the authorship of any provision of this Agreement.

Section 10.16 Articles, Sections,

Exhibits and Schedules. All articles and sections referred to herein are articles and sections, respectively, of this Agreement and all exhibits and schedules referred to herein are exhibits and schedules, respectively, attached to this

Agreement. Descriptive headings as to the contents of particular sections are for convenience only and do not control or affect the meaning, construction or interpretation of this Agreement or any particular section. Any and all schedules, exhibits,

certificates or other documents or instruments referred to herein or attached hereto are and will be incorporated herein by reference hereto as though fully set forth herein.

Section 10.17 Public Disclosure. Neither TCBX nor Great Plains, or any Affiliate or Subsidiary of the same, will make any

announcement, statement, press release, acknowledgment or other public disclosure of the existence of, or reveal the terms, conditions or the status of, this Agreement or the transactions contemplated hereby without the prior written consent of the

other parties to this Agreement (which shall not be unreasonably withheld, conditioned or delayed); provided, however, that (a) TCBX and Great Plains are permitted to make any public disclosures or governmental filings as legal counsel may deem

necessary to maintain compliance with or to prevent violations of applicable Law, that may be necessary to obtain regulatory approval for the transactions contemplated hereby, or that may be necessary to enforce the obligations under this Agreement

and (b) TCBX may disclose the existence of, or reveal the terms, conditions or the status of, this Agreement or the transactions contemplated hereby to potential investors in TCBX that are bound by a confidentiality agreement.

Section 10.18 Extension; Waiver. At any time prior to the Closing Date, the

parties may (a) extend the time for the performance of any of the obligations or other acts of the other parties hereto, (b) waive any inaccuracies in the representations and warranties contained herein or in any document, certificate or

writing delivered pursuant hereto, or (c) waive compliance with any of the agreements, covenants or conditions contained herein. Such action will be evidenced by a signed written notice given in the manner provided in

Section 10.08. No party to this Agreement will by any act (except by a written instrument given pursuant to Section 10.08) be deemed to have waived any right or remedy hereunder or to have

acquiesced in any breach of any of the terms and conditions hereof. No failure to exercise nor any delay in exercising any right, power or privilege hereunder by any party hereto will operate as a waiver thereof. No single or partial exercise of any

right, power or privilege hereunder will preclude any other or further exercise thereof or the exercise of any other right, power or privilege. A waiver of any party of any right or remedy on any one occasion will not be construed as a bar to any

right or remedy that such party would otherwise have on any future occasion or to any right or remedy that any other party may have hereunder. Any party may unilaterally waive a right which is solely applicable to it.

Section 10.19 Amendment. This Agreement may be amended, modified or supplemented only by an instrument in writing executed by each

of the parties hereto.

Section 10.20 No Third Party Beneficiaries. Except as provided in

Section 5.23(e), nothing contained in this Agreement, express or implied, is intended to confer upon any Persons, other than the parties hereto or their respective successors, any rights, remedies, obligations, or

liabilities under or by reason of this Agreement.

Section 10.21 Confidential Supervisory Information. Notwithstanding any

other provision of this Agreement, no disclosure, representation or warranty shall be made (or other action taken) pursuant to this Agreement that would involve the disclosure of confidential supervisory information (including confidential

supervisory information as defined in 12 C.F.R. Section 261.2(c) and as identified in 12 C.F.R. Section 309.5(g)(8)) of a Governmental Entity by any party to the extent prohibited by applicable law. To the extent legally permissible,

appropriate substitute disclosures or actions shall be made or taken under circumstances in which the limitations of the preceding sentence apply.

[Signature Page Follows]

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be signed by their duly

authorized officers as of the date first above written.

THIRD COAST BANCSHARES, INC.

By:

/s/ Bart O. Caraway

Name: Bart O. Caraway

Title: Chairman, President and Chief Executive Officer

THUNDER MERGER SUB, INC.

By:

/s/ Bart O. Caraway

Name: Bart O. Caraway

Title: President

GREAT PLAINS BANCSHARES, INC.

By:

/s/ Mark L. Russell

Name: Mark L. Russell

Title: Chief Executive Officer

[Signature Page to

Agreement and Plan of Reorganization]

EX-10.1

Filename: d160832dex101.htm · Sequence: 3

EX-10.1

Exhibit 10.1

VOTING AGREEMENT

This VOTING AGREEMENT (this “Agreement”) dated as of October 6, 2026 is executed by and among Third Coast

Bancshares, Inc. (“TCBX”), a Texas corporation and registered bank holding company under the Bank Holding Company Act of 1956, as amended (the “BHCA”), Great Plains Bancshares, Inc. (“Great

Plains”), an Oklahoma corporation and registered bank holding company under the BHCA, Bart O. Caraway (“Proxy Holder”), as proxy, and the shareholders of Great Plains listed on the signature pages to this Agreement

(referred to herein individually as a “Shareholder” and collectively as the “Shareholders”). Terms with their initial letters capitalized and not otherwise defined herein have the meanings given them in the

Reorganization Agreement (as defined below).

RECITALS

WHEREAS, concurrently with the execution of this Agreement, TCBX, Thunder Merger Sub, Inc. (“Merger Sub”), an Oklahoma

corporation and wholly owned subsidiary of TCBX, and Great Plains have entered into that certain Agreement and Plan of Reorganization, dated as of the date hereof (the “Reorganization Agreement”), providing for TCBX’s

acquisition of Great Plains through the merger of Merger Sub with and into Great Plains (the “Merger”), with Great Plains surviving as a wholly owned subsidiary of TCBX;

WHEREAS, the Reorganization Agreement provides that all of the issued and outstanding shares of common stock, par value $1.00 per share, of

Great Plains (the “Common Stock”), other than Cancelled Shares and Dissenting Shares, will be exchanged for such consideration as set forth in the Reorganization Agreement;

WHEREAS, as a condition and inducement to TCBX’s willingness to enter into the Reorganization Agreement, each of the Shareholders have

agreed to vote their shares of Common Stock in favor of approval of the Reorganization Agreement and the transactions contemplated thereby; and

WHEREAS, TCBX is relying on the agreements set forth herein in incurring expenses in reviewing the business of Great Plains and its wholly

owned banking subsidiary, Great Plains National Bank, a national banking association with its principal office in Elk City, Oklahoma (the “Bank”), in proceeding with the filing of applications for regulatory approvals, and in

undertaking other actions necessary for the consummation of the Merger, and the Shareholders are benefiting both from such expenditures by TCBX and by the terms of the Reorganization Agreement.

NOW, THEREFORE, for and in consideration of the foregoing and other good and valuable consideration, the receipt and sufficiency of which are

hereby acknowledged, Great Plains, TCBX, the Proxy Holder and the Shareholders undertake, promise, covenant and agree with each other as follows:

AGREEMENT

1. Each Shareholder, being the registered owner of the number of shares of Common Stock set forth below the Shareholder’s name on the

signature pages hereto (for each such Shareholder, the “Shares”), will vote, direct to vote, or act by consent with respect to:

(a)

the Shares;

(b)

all Common Stock the Shareholder owns as of the record date of any meeting of the shareholders of Great Plains

or otherwise as of the date of such vote or consent; and

(c)

all Common Stock the Shareholder owns beneficially and has the power and authority to direct the voting thereof

as of the record date of any meeting of the shareholders of Great Plains or otherwise as of the date of such vote or consent

(clauses

(a), (b) and (c), collectively, the “Proxy Shares”), in favor of approval of the Merger, the Reorganization Agreement and any other transactions contemplated by the Reorganization Agreement.

2. If Great Plains conducts a meeting of or otherwise seeks approval of its shareholders with respect to any Acquisition Proposal (as defined

in the Reorganization Agreement) or any other matter that may contradict this Agreement or the Reorganization Agreement or may prevent TCBX or Great Plains from completing the Merger, then the Shareholders will vote the Proxy Shares against the

approval of the Acquisition Proposal or otherwise act in the manner most favorable to completing the Merger and the transactions contemplated by the Reorganization Agreement.

3. Each Shareholder shall not invite or seek any Acquisition Proposal, support (or publicly suggest that anyone else should support) any

Acquisition Proposal that may be made, or ask the Great Plains Board to consider, support or seek any Acquisition Proposal or otherwise take any action designed to make any Acquisition Proposal more likely. None of the Shareholders shall meet or

otherwise communicate with any Person that makes or is considering making an Acquisition Proposal or any representative of such Person after becoming aware that the Person has made or is considering making an Acquisition Proposal. Each Shareholder

shall promptly advise Great Plains of each contact the Shareholder or any of the Shareholder’s representatives may receive from any Person relating to any Acquisition Proposal or otherwise indicating that any Person may wish to participate or

engage in any transaction arising out of any Acquisition Proposal and will provide Great Plains with all information TCBX requests that is available to the Shareholder regarding any such Acquisition Proposal or possible Acquisition Proposal. Each

Shareholder will not make any claim or join in any litigation alleging that the Great Plains Board is required to consider, endorse or support any Acquisition Proposal or to invite or seek any Acquisition Proposal. Each Shareholder shall not take

any other action that is reasonably likely to make consummation of the Merger less likely or to impair TCBX’s ability to exercise any of the rights granted by the Reorganization Agreement. Notwithstanding the foregoing and for purposes of

clarity, nothing contained herein shall prevent any Shareholder from taking actions on behalf of Great Plains, solely in his or her capacity as a director or officer of Great Plains, that are expressly permitted by Section 5.22 of the

Reorganization Agreement.

4. Each Shareholder, severally, but not jointly, represents and warrants to TCBX that:

(a)

Shareholder (i) owns beneficially (as such term is defined in Rule

13d-3 under the Exchange Act) all of the Shares free and clear of all liens or encumbrances, and (ii) except pursuant hereto, there are no options, warrants or other rights, agreements, arrangements or

commitments of any character to which Shareholder is a party relating to the pledge, disposition or voting of any of the Shares and there are no voting trusts or voting agreements with respect to the Shares.

(b)

Shareholder does not beneficially own any Common Stock other than (i) the Shares and (ii) any

options, warrants or other rights to acquire any additional shares of Common Stock or any security exercisable for or convertible into shares of Common Stock, set forth on the signature page of this Agreement.

(c)

Shareholder has full power and authority and legal capacity to enter into, execute and deliver this Agreement

and to perform fully Shareholder’s obligations hereunder (including the proxy described in Section 5 below). This Agreement has been duly and validly executed and delivered by Shareholder and constitutes the legal,

valid and binding obligation of Shareholder, enforceable against Shareholder in accordance with its terms.

(d)

None of the execution and delivery of this Agreement by Shareholder, the consummation by Shareholder of the

transactions contemplated hereby or compliance by Shareholder with any of the provisions hereof will conflict with or result in a breach, or constitute a default (with or without notice or lapse of time or both) under any provision of, any trust

agreement, loan or credit agreement, note, bond, mortgage, indenture, lease or other agreement, instrument or law applicable to Shareholder or to Shareholder’s property or assets.

(e)

No consent, approval or authorization of, or designation, declaration or filing with, any Governmental Entity

or other Person on the part of Shareholder is required in connection with the valid execution and delivery of this Agreement. No consent of Shareholder’s spouse is necessary under any “community property” or other laws in order for

Shareholder to enter into and perform its obligations under this Agreement.

(f)

Shareholder hereby (a) confirms his or her knowledge of the availability of the rights of dissenting

shareholders under the Oklahoma General Corporation Act (the “OGCA”) with respect to the Merger and (b) confirms receipt of a copy of the provisions of the OGCA related to the rights of dissenting shareholders. Each

Shareholder hereby waives and agrees not to

assert, and shall use its best efforts to cause any of its Affiliates who hold of record any of the Shareholder’s Shares to waive and not to assert, any appraisal rights with respect to the

Merger that the Shareholder or such Affiliate may now or hereafter have with respect to any Shares (or any other shares of capital stock of Great Plains that the Shareholder shall hold of record at the time that the Shareholder may be entitled to

assert appraisal rights with respect to the Merger) whether pursuant to the OGCA or otherwise.

5. In order to better effect

the provisions of Sections 1 and 2 of this Agreement, each Shareholder hereby revokes any previously executed proxies and hereby constitutes and appoints Proxy Holder, with full power of substitution, his true and lawful proxy and attorney-in-fact to vote at any meeting of the shareholders of Great Plains all of the Proxy Shares in favor of the approval of the Merger and any other transactions

contemplated by the Reorganization Agreement, with such modifications to the Reorganization Agreement as the parties thereto may make; but this proxy will not apply with respect to any vote on approval of the Merger contemplated by the

Reorganization Agreement if the Reorganization Agreement is modified so as to (i) reduce the amount of consideration or the form of consideration to be received by the Shareholder or (ii) materially alter the tax consequences of the

receipt thereof under the Reorganization Agreement in its present form. This proxy shall be limited strictly and solely to the power and authority to vote the Proxy Shares in the manner and for the purpose set forth in Sections 1 and 2

of this Agreement and shall not extend to any other matters.

6. Each Shareholder hereby covenants and agrees that until this Agreement is

terminated in accordance with its terms, each Shareholder will not, and will not agree to, without the consent of TCBX, directly or indirectly, sell, transfer, assign, pledge, encumber, hypothecate, cause to be redeemed or otherwise dispose of (any

such transaction, a “Transfer”) any of the Shares or grant any proxy or interest in or with respect to any Shares or deposit any such Shares into a voting trust or enter into another voting agreement or arrangement with respect to

such Shares except as contemplated by this Agreement. Any attempted Transfer of Shares or any interest therein in violation of this Section shall be null and void. This Section shall not prohibit a Transfer of the Shares to any member of

Shareholder’s immediate family, to another Shareholder, to a trust for the benefit of Shareholder or any member of Shareholder’s immediate family, or upon the death of Shareholder; provided, that a Transfer referred to in this sentence

shall be permitted only if, as a precondition to such Transfer, the transferee agrees in a writing, reasonably satisfactory in form and substance to TCBX, to be bound by all of the terms of this Agreement.

7. Proxy Holder, by his execution below, agrees to (A) vote all of the Shareholders’ Proxy Shares at any meeting of the

shareholders of Great Plains, in favor of the approval of the Merger and any other transactions contemplated by the Reorganization Agreement, with such modifications to the Reorganization Agreement as the parties thereto may make; but this proxy

will not apply with respect to any vote on approval of the Merger contemplated by the Reorganization Agreement if the Reorganization Agreement is modified so as to (i) reduce the amount of consideration or the form of consideration to be

received by the Shareholder or (ii) materially alter the tax consequences of the receipt thereof under the Reorganization Agreement in its present form and (B) in the event of an Acquisition Proposal, vote all of the Shareholders’

Proxy Shares at any meeting of the shareholders of Great Plains, against the approval of the Acquisition Proposal or otherwise act in the manner most favorable to completing the Merger and the transactions contemplated by the Reorganization

Agreement.

8. Each Shareholder acknowledges that TCBX and Great Plains are relying on this Agreement in

incurring expenses in connection with TCBX’s reviewing Great Plains’ and the Bank’s business, in Great Plains’ cooperation with TCBX’s preparation of a Registration Statement on Form

S-4, in TCBX’s proceeding with the filing of applications for regulatory approvals, and in their undertaking other actions necessary for completing the Merger and that THE PROXY GRANTED HEREBY IS

COUPLED WITH AN INTEREST AND IS IRREVOCABLE TO THE FULL EXTENT PERMITTED BY APPLICABLE LAW, INCLUDING TO THE EXTENT APPLICABLE, SECTION 1057 OF THE OGCA. The Shareholders and Great Plains acknowledge that the performance of this

Agreement is intended to benefit TCBX.

9. This Agreement shall remain in effect until the earlier to occur of (a) the date the

Reorganization Agreement is terminated pursuant to Section 9.01 of the Reorganization Agreement or (b) the date that is twenty-four (24) months after the Closing Date.

10. Proxy Holder may, in his sole discretion, appoint a substitute proxy to act as Proxy Holder under this Agreement; provided, that any

substitute proxy shall agree in writing to be bound by the terms and conditions of this Agreement. In the event of the death, disability or incapacity of Proxy Holder, TCBX, in its sole discretion, may appoint a substitute proxy to act as Proxy

Holder under this Agreement.

11. The vote of the Proxy Holder will control in any conflict between his vote of the Proxy Shares and a

vote by the substitute proxy holder or the Shareholders of the Proxy Shares, and Great Plains agrees to recognize the vote of the Proxy Holder instead of the vote of the substitute proxy holder or the Shareholders if the substitute proxy holder or

the Shareholders do not vote in accordance with Sections 1 and 2 of this Agreement.

12. This Agreement may be amended,

modified or supplemented with respect to a particular Shareholder only by an instrument in writing executed by TCBX, Great Plains and that Shareholder. Any such amendment, modification or supplement shall only apply to the Shareholder(s) executing

such written agreement and this Agreement will remain in full force and effect with respect to Shareholders who do not execute such written agreement.

13. For the convenience of the parties hereto, this Agreement may be signed in multiple counterparts, each of which will be deemed an

original, and all counterparts hereof so signed by the parties hereto, whether or not such counterpart will bear the execution of each of the parties hereto, will be deemed to be, and is to be construed as, one and the same Agreement. An email or

electronic scan in “PDF” format of a signed counterpart of this Agreement will be sufficient to bind the party or parties whose signature(s) appear thereon.

14. This Agreement, the Reorganization Agreement and the other agreements, documents,

schedules and instruments signed and delivered by the parties to each other at the Closing are the full understanding of the parties, a complete allocation of risks between them and a complete and exclusive statement of the terms and conditions of

their agreement relating to the subject matter hereof and supersede any and all prior agreements, whether written or oral, that may exist between the parties with respect thereto. Except as otherwise specifically provided in this Agreement, no

conditions, usage of trade, course of dealing or performance, understanding or agreement purporting to modify, vary, explain or supplement the terms or conditions of this Agreement is binding unless hereafter made in writing and signed by the party

to be bound, and no modification will be effected by the acknowledgment or acceptance of documents containing terms or conditions at variance with or in addition to those set forth in this Agreement.

15. Any and all notices, requests, instructions and other communications required or permitted to be given under this Agreement after the date

of this Agreement by any party hereto to any other party may be delivered personally or by nationally recognized overnight courier service or sent by U.S. mail or (except in the case of payments) by email, at the respective addresses set forth below

and is deemed delivered (a) in the case of personal delivery or email, when received; (b) in the case of mail, upon the earlier of actual receipt or five (5) Business Days after deposit in the United States Postal Service, first class

certified or registered mail, postage prepaid, return receipt requested; and (c) in the case of an overnight courier service, one (1) Business Day after delivery to such courier service with instructions for overnight delivery. The parties

may change their respective addresses by written notice to all other parties, sent as provided in this Section. All communications must be in writing and addressed as follows:

IF TO GREAT PLAINS OR THE SHAREHOLDERS:

Todd Taylor

Chairman of the

Board

Great Plains Bancshares, Inc.

2017 West Third Street

Elk City,

Oklahoma 73664

Email: [***]

WITH A COPY (WHICH SHALL NOT CONSTITUTE NOTICE) TO:

Chet A. Fenimore, Esq.

Fenimore

Kay Harrison LLP

805 Las Cimas Parkway, Suite 350

Austin, Texas 78746

Email:

cfenimore@fkhpartners.com

IF TO TCBX OR PROXY HOLDER:

Bart O. Caraway

Chairman,

President and Chief Executive Officer

Third Coast Bancshares, Inc.

20202 Highway 59 North, Suite 190

Humble, Texas 77338

Email: [***]

WITH A COPY (WHICH SHALL NOT CONSTITUTE NOTICE) TO:

Michael G. Keeley, Esq.

Norton

Rose Fulbright US LLP

2200 Ross Avenue, Suite 3600

Dallas, Texas 75201-7932

Email:

mike.keeley@nortonrosefulbright.com

16. THIS AGREEMENT IS TO BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF

TEXAS, WITHOUT REGARD FOR THE PROVISIONS THEREOF REGARDING CHOICE OF LAW THAT WOULD APPLY THE LAW OF A DIFFERENT JURISDICTION. VENUE FOR ANY CAUSE OF ACTION BETWEEN THE PARTIES TO THIS AGREEMENT WILL LIE IN HARRIS COUNTY, TEXAS. EACH PARTY

ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY

APPLICABLE LAW, ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY SUIT, ACTION OR OTHER PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. EACH PARTY

CERTIFIES AND ACKNOWLEDGES THAT: (A) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF ANY ACTION, SUIT OR PROCEEDING, SEEK TO ENFORCE THE FOREGOING

WAIVER, (B) EACH PARTY UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (C) EACH PARTY MAKES THIS WAIVER VOLUNTARILY, AND (D) EACH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL

WAIVERS AND CERTIFICATIONS IN THIS SECTION 16.

17. All of the terms, covenants, representations, warranties and conditions of

this Agreement are binding upon, and inure to the benefit of and are enforceable by, the parties and their respective successors, representatives and permitted assigns. No party to this Agreement may assign this Agreement, by operation of law or

otherwise, in whole or in part, without the prior written consent of the other parties, and any purported assignment made or attempted in violation of this Section shall be null and void. Nothing contained in this Agreement, express or implied, is

intended to confer upon any Persons, other than the parties hereto or their respective successors, any rights, remedies, obligations, or liabilities under or by reason of this Agreement.

18. If any provision of this Agreement is held to be illegal, invalid or unenforceable under

present or future laws, then (a) this Agreement is to be construed and enforced as if such illegal, invalid or unenforceable provision were not a part hereof; (b) the remaining provisions of this Agreement will remain in full force and

effect and will not be affected by such illegal, invalid or unenforceable provision or by its severance from this Agreement; and (c) there will be added automatically as a part of this Agreement a provision mutually agreed to which is similar

in terms to such illegal, invalid or unenforceable provision as may be possible and still be legal, valid and enforceable.

19. Each of

the parties hereto acknowledges that the other parties would be irreparably damaged and would not have an adequate remedy at law for money damages if any of the covenants contained in this Agreement were not performed in accordance with its terms or

otherwise were materially breached. Each of the parties hereto therefore agrees that, without the necessity of proving actual damages or posting bond or other security, the other party will be entitled to temporary and/or permanent injunction or

injunctions which a court of competent jurisdiction concludes is justified to prevent breaches of such performance and to specific enforcement of such covenants in addition to any other remedy to which they may be entitled, at law or in equity.

[Signature Page Follows]

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first

above written.

THIRD COAST BANCSHARES, INC.

By:

Name:

Bart O. Caraway

Title:

Chairman, President and

Chief Executive Officer

PROXY HOLDER:

Bart O. Caraway

GREAT PLAINS BANCSHARES, INC.

By:

Name:

Mark L. Russell

Title:

Chief Executive Officer

[Signature Page to Voting

Agreement]

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first

above written.

SHAREHOLDERS

[Name]

Number of Shares: [Shares]

[Name]

Number of Shares: [Shares]

[Signature Page to Voting

Agreement]

EX-10.2

Filename: d160832dex102.htm · Sequence: 4

EX-10.2

Exhibit 10.2

DIRECTOR SUPPORT AGREEMENT

This DIRECTOR SUPPORT AGREEMENT (the “Agreement”) is made and entered into as of October 6, 2026, by and

between Third Coast Bancshares, Inc. (“TCBX”), a Texas corporation and registered bank holding company under the Bank Holding Company Act of 1956, as amended (the “BHCA”), and [_], an individual resident of the

State of [_] (“Director”). Terms with their initial letters capitalized and not otherwise defined herein have the meanings given to them in the Reorganization Agreement (as defined below).

RECITALS

WHEREAS,

concurrently with the execution of this Agreement, TCBX, Thunder Merger Sub, Inc. (“Merger Sub”), an Oklahoma corporation and wholly owned subsidiary of TCBX, and Great Plains Bancshares, Inc. (“Great Plains”),

an Oklahoma corporation and registered bank holding company under the BHCA, have entered into that certain Agreement and Plan of Reorganization, dated as of the date hereof (the “Reorganization Agreement”), providing for

TCBX’s acquisition of Great Plains through the merger of Merger Sub with and into Great Plains (the “Merger”), with Great Plains surviving as a wholly owned subsidiary of TCBX;

WHEREAS, TCBX will acquire all of the assets and liabilities of Great Plains, including all of the goodwill of Great Plains, pursuant to the

Reorganization Agreement which provides, among other things, that (i) Merger Sub will merge with and into Great Plains and (ii) that all of the issued and outstanding shares of common stock, par value $1.00 per share, of Great Plains (the

“Great Plains Stock”), other than Cancelled Shares and Dissenting Shares, will be exchanged for the Merger Consideration, which includes a premium to the fair market value and includes the goodwill of Great Plains; and

WHEREAS, as a condition and inducement to TCBX’s willingness to enter into the Reorganization Agreement, TCBX and Director have agreed

to enter into this Agreement.

NOW, THEREFORE, in consideration for receipt of such confidential information and trade secrets and in

consideration of the premises and mutual covenants contained herein and in the Reorganization Agreement intending to be legally bound hereby, TCBX and Director agree as follows;

AGREEMENT

Director Support. Director agrees to use his or her best efforts to refrain from harming the goodwill of Great Plains, any Subsidiary of Great Plains (“Great Plains Subsidiary”), TCBX or any Subsidiary of TCBX, and their

respective customer, client and vendor relationships. During the term of this Agreement, Director agrees also to consider Third Coast Bank, a Texas state bank with its principal office in Humble, Texas (“Third Coast Bank”), when

obtaining banking products or services for his or her personal or business needs; provided, however, that this Agreement shall not require Director to contact Third Coast Bank for a proposal on any such needs.

2. Director Covenants.

(a) Director acknowledges that he or she has received substantial, valuable consideration, including confidential trade secret

and proprietary information relating to the identity and special needs of current and prospective customers of Great Plains or any Great Plains Subsidiary, Great Plains’ and any Great Plains Subsidiary’s current and prospective services,

Great Plains’ and any Great Plains Subsidiary’s business projections and market studies, Great Plains’ and any Great Plains Subsidiary’s business plans and strategies, Great Plains’ and any Great Plains

Subsidiary’s studies and information concerning special services unique to Great Plains or any Great Plains Subsidiary. Director further acknowledges and agrees that this consideration, including the Merger Consideration, constitutes fair and

adequate consideration for the execution of the non-solicitation and non-competition restrictions set forth below. Accordingly, other than in any capacity for or on

behalf of TCBX or any Subsidiary of TCBX, or as set forth on Schedule A attached hereto, Director agrees that Director will not, directly or indirectly, individually or as an employee, partner, officer, director or shareholder or in any other

capacity whatsoever:

i. solicit the business of any person or entity who is a customer of Great Plains or any Great Plains

Subsidiary as of the date of this Agreement or as of the Closing Date on behalf of any other insured depository institution for the purpose of providing financial services to such person or entity;

ii. acquire any interest in (directly or indirectly), charter, operate or enter into any franchise or other management

agreement with any insured depository institution that has a location (A) in any county in which Great Plains or a Great Plains Subsidiary has a location as of the Effective Time, or (B) in any county that is contiguous to any of such

counties (the “Noncompete Area”) (but notwithstanding the foregoing, Director may (1) retain any existing ownership interest in any insured depository institution as disclosed on Schedule B attached hereto, (2) acquire

an ownership interest in any publicly-traded depository institution, so long as that ownership interest does not exceed 1% of the total number of shares outstanding of that depository institution, and (3) invest in an existing mutual fund that

invests, directly or indirectly, in such insured depository institutions);

iii. from and after the Effective Time, serve

as an officer, director, employee, agent or consultant to any insured depository institution that has a location within the Noncompete Area;

iv. establish or operate a branch or other office of an insured depository institution within the Noncompete Area; or

v. recruit, hire, assist others in recruiting or hiring, discuss employment

with, or refer others concerning employment, any person who is, or within the 12 months preceding the Closing Date was, an employee of Great Plains or any Great Plains Subsidiary; but nothing in this Section 2(a)(v) applies

to employment other than in financial services and Director shall not be prohibited from hiring any such person who (A) is terminated by Great Plains or any Great Plains Subsidiary (or their respective successors) or who has voluntarily

resigned from employment by Great Plains or any Great Plains Subsidiary (or their respective successors) without direct or indirect solicitation by Director, (B) responds to any general advertisement appearing in a newspaper, magazine or trade

publication, or (C) is a referral made by a placement agency or service so long as such placement agency or service has not been instructed by Director to solicit from Great Plains or any Great Plains Subsidiary (or their respective successors)

such person; provided that in each case of clauses (A) through (C) at least six (6) months have elapsed from the date the person’s employment ended with Great Plains, any Great Plains Subsidiary, TCBX or any Subsidiary of TCBX.

Director may not avoid the purpose and intent of this Section 2(a) by engaging in conduct within the Noncompete Area

from a remote location through means such as telecommunications, written correspondence, computer generated or assisted communications, or other similar methods.

(b) If any court of competent jurisdiction should determine that the terms of this Section 2 are too

broad in terms of time, geographic area, lines of commerce or otherwise, that court is to modify and revise any such terms so that they comply with applicable law.

(c) Director agrees that (i) this Agreement is entered into in connection with the sale to TCBX of Great Plains and Great

Plains National Bank, a national banking association with its principal office in Elk City, Oklahoma (the “Bank”), (ii) Director is receiving valuable consideration for this Agreement, (iii) the restrictions imposed upon

Director by this Agreement are essential and necessary to ensure TCBX acquires the goodwill of the Bank, and (iv) all the restrictions (including particularly the time and geographical limitations) set forth in this Agreement are fair and

reasonable.

3. Shareholder Representation. Director hereby represents and warrants that he or she is the registered owner of the

number of shares of Great Plains Stock set forth below the Director’s name on the signature page hereto.

4. Early Resolution

Conference. This Agreement is understood to be clear and enforceable as written and is executed by both parties on that basis. However, should Director later challenge any provision as unclear, unenforceable, or inapplicable to any competitive

activity that Director intends to engage in, Director will first notify TCBX in writing and meet with a TCBX representative and a neutral mediator (if TCBX elects to retain one at its expense) to discuss resolution of any disputes between the

parties. Director will provide this notice at least twenty-one (21) days before Director engages in any activity on behalf of a competing business or engages in other activity that could foreseeably fall

within a questioned restriction. If Director fails to comply with this requirement, Director waives his or her right to challenge the reasonable scope, clarity, applicability or enforceability of this Agreement and its restrictions at a later time.

5. Termination. This Agreement and all obligations hereunder will terminate on the

earlier of (a) the date the Reorganization Agreement is terminated pursuant to Section 9.01 of the Reorganization Agreement or (b) the date that is twenty-four (24) months after the Closing Date.

6. Waiver, Amendment and Modification. Any party may unilaterally waive a right which is solely applicable to it. Such action will be

evidenced by a signed written notice. No failure to exercise nor any delay in exercising any right, power or privilege hereunder by any party hereto will operate as a waiver thereof. No single or partial exercise of any right, power or privilege

hereunder will preclude any other or further exercise thereof or the exercise of any other right, power or privilege. A waiver of any party of any right or remedy on any one occasion will not be construed as a bar to any right or remedy that such

party would otherwise have on any future occasion or to any right or remedy that any other party may have hereunder. This Agreement may be amended, modified or supplemented only by an instrument in writing executed by each of the parties hereto.

7. Governing Law. THIS AGREEMENT IS TO BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF OKLAHOMA,

WITHOUT REGARD FOR THE PROVISIONS THEREOF REGARDING CHOICE OF LAW THAT WOULD APPLY THE LAW OF A DIFFERENT JURISDICTION. VENUE FOR ANY CAUSE OF ACTION BETWEEN THE PARTIES TO THIS AGREEMENT WILL LIE IN OKLAHOMA COUNTY, OKLAHOMA. EACH PARTY

ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES AND, THEREFORE, EACH SUCH PARTY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY

IN RESPECT OF ANY LEGAL ACTION ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. EACH PARTY TO THIS AGREEMENT CERTIFIES AND ACKNOWLEDGES THAT (A) NO REPRESENTATIVE OF ANY OTHER PARTY

HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT SEEK TO ENFORCE THE FOREGOING WAIVER IN THE EVENT OF A LEGAL ACTION, (B) SUCH PARTY HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER,

(C) SUCH PARTY MAKES THIS WAIVER VOLUNTARILY, AND (D) SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION

8. Binding Effect; Assignment. All of the terms, covenants, representations, warranties and conditions of this

otherwise, in whole or in part, without the prior written consent of the other parties, and any purported assignment made or attempted in violation of this Section shall be null and void.

9. No Third Party Beneficiaries. Nothing contained in this Agreement, express or

implied, is intended to confer upon any Persons, other than the parties hereto or their respective successors, any rights, remedies, obligations, or liabilities under or by reason of this Agreement.

10. Severability. If any provision of this Agreement is held to be illegal, invalid or unenforceable under present or future laws, then

(a) this Agreement is to be construed and enforced as if such illegal, invalid or unenforceable provision were not a part hereof; (b) the remaining provisions of this Agreement will remain in full force and effect and will not be affected

by such illegal, invalid or unenforceable provision or by its severance from this Agreement; and (c) there will be added automatically as a part of this Agreement a provision mutually agreed to which is similar in terms to such illegal, invalid

or unenforceable provision as may be possible and still be legal, valid and enforceable.

11. Specific Performance. Each of the

parties hereto acknowledges that the other parties would be irreparably damaged and would not have an adequate remedy at law for money damages if any of the covenants contained in this Agreement were not performed in accordance with its terms or

12. Entire Agreement. This Agreement, the Reorganization Agreement, the Voting Agreement and the other agreements, documents, schedules

and instruments signed and delivered by the parties to each other at the Closing are the full understanding of the parties, a complete allocation of risks between them and a complete and exclusive statement of the terms and conditions of their

agreement relating to the subject matter hereof and supersede any and all prior agreements, whether written or oral, that may exist between the parties with respect thereto. Except as otherwise specifically provided in this Agreement, no conditions,

usage of trade, course of dealing or performance, understanding or agreement purporting to modify, vary, explain or supplement the terms or conditions of this Agreement is binding unless hereafter made in writing and signed by the party to be bound,

and no modification will be effected by the acknowledgment or acceptance of documents containing terms or conditions at variance with or in addition to those set forth in this Agreement.

13. Rules of Construction. Descriptive headings as to the contents of particular sections are for convenience only and do not control

or affect the meaning, construction or interpretation of this Agreement or any particular section. Whenever the words “include,” “includes” or “including” are used in this Agreement, they are deemed to be followed

by the words “without limitation.” The words “hereof,” “herein” and “hereunder” and words of similar import when used in this Agreement refer to this Agreement as a whole and not to any particular

provision in this Agreement. Each use herein of the masculine, neuter or feminine gender is deemed to include the other genders. Each use herein of the plural includes the singular and vice versa, in each case as the context requires or as is

otherwise appropriate. The word “or” is used in the inclusive sense. Any agreement or instrument defined or referred to herein or in any agreement or instrument that

is referred to herein means such agreement or instrument as from time to time amended, modified or supplemented, including by waiver or consent. References to a Person are also to its permitted

successors or assigns. In the event that an ambiguity or a question of intent or interpretation arises, this Agreement shall be construed as if drafted jointly by the parties, and no presumption or burden of proof shall arise favoring or disfavoring

any party by virtue of the authorship of any provision of this Agreement.

14. Notice. Any and all notices, requests, instructions

and other communications required or permitted to be given under this Agreement after the date of this Agreement by any party hereto to any other party may be delivered personally or by nationally recognized overnight courier service or sent by U.S.

mail or (except in the case of payments) by email at the respective addresses set forth below and is deemed delivered (a) in the case of personal delivery or email, when received; (b) in the case of mail, upon the earlier of actual receipt

or five (5) Business Days after deposit in the United States Postal Service, first class certified or registered mail, postage prepaid, return receipt requested; and (c) in the case of an overnight courier service, one (1) Business

Day after delivery to such courier service with instructions for overnight delivery. The parties may change their respective addresses by written notice to all other parties, sent as provided in this Section. All communications must be in writing

and addressed as follows:

If to Director:

[Name]

[Address]

Email: [Address]

If to TCBX:

Bart O. Caraway

Chairman, President and Chief Executive Officer

Third Coast Bancshares, Inc.

20202 Highway 59 North, Suite 190

Humble, Texas 77338

Email: [***]

With a copy (which shall not constitute notice) to:

Michael G. Keeley, Esq.

Norton

Rose Fulbright US LLP

2200 Ross Avenue, Suite 3600

Dallas, Texas 75201-7932

Email:

mike.keeley@nortonrosefulbright.com

15. Articles, Sections, Exhibits and Schedules. All articles and sections referred to

herein are articles and sections, respectively, of this Agreement and all exhibits and schedules referred to herein are exhibits and schedules, respectively, attached to this Agreement. Descriptive headings as to the contents of particular sections

are for convenience only and do not control or affect the meaning, construction or interpretation of this Agreement or any particular section. Any and all schedules, exhibits, certificates or other documents or instruments referred to herein or

attached hereto are and will be incorporated herein by reference hereto as though fully set forth herein.

16. Multiple

Counterparts. For the convenience of the parties hereto, this Agreement may be signed in multiple counterparts, each of which will be deemed an original, and all counterparts hereof so signed by the parties hereto, whether or not such

counterpart will bear the execution of each of the parties hereto, will be deemed to be, and is to be construed as, one and the same Agreement. A facsimile or electronic scan in “PDF” format of a signed counterpart of this Agreement will

be sufficient to bind the party or parties whose signature(s) appear thereon.

[Signature Page Follows]

IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first above

written.

DIRECTOR

[Name]

Number of Shares: [Number]

[Signature Page to

Director Support Agreement]

THIRD COAST BANCSHARES, INC.

Bart O. Caraway,

Its: Chairman, President and Chief Executive Officer

[Signature Page to

Director Support Agreement]

SCHEDULE A

SCHEDULE B

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 9

v3.26.3

Document and Entity Information

Oct. 06, 2026

Cover [Abstract]

Amendment Flag

false

Entity Central Index Key

0001781730

Document Type

8-K

Document Period End Date

Oct. 06, 2026

Entity Registrant Name

THIRD COAST BANCSHARES, INC.

Entity Incorporation State Country Code

Entity File Number

001-41028

Entity Tax Identification Number

46-2135597

Entity Address, Address Line One

20202 Highway 59 North

Entity Address, Address Line Two

Suite 190

Entity Address, City or Town

Humble

Entity Address, State or Province

Entity Address, Postal Zip Code

77338

City Area Code

281

Local Phone Number

446-7000

Written Communications

true

Soliciting Material

false

Pre Commencement Tender Offer

false

Pre Commencement Issuer Tender Offer

false

Security 12b Title

Common stock, par value $1.00 per share

Trading Symbol

TCBX

Security Exchange Name

NYSE

Entity Emerging Growth Company

true

Entity Ex Transition Period

false

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Cover page.

+ References

No definition available.

+ Details

Name:

dei_CoverAbstract

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

duration

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

Period Type:

duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 2 such as Street or Suite number

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine2

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

Period Type:

duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 7A

-Section B

-Subsection 2

+ Details

Name:

dei_EntityExTransitionPeriod

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

Period Type:

duration

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

Period Type:

duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

Period Type:

duration

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

Period Type:

duration

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration