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Form 8-K

sec.gov

8-K — ISABELLA BANK CORP

Accession: 0000842517-26-000176

Filed: 2026-07-23

Period: 2026-07-23

CIK: 0000842517

SIC: 6022 (STATE COMMERCIAL BANKS)

Item: Results of Operations and Financial Condition

Item: Financial Statements and Exhibits

Documents

8-K — isba-20260723.htm (Primary)

EX-99.1 (earningsrelease_20260630xe.htm)

GRAPHIC — ISBA LOGO (logo.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: isba-20260723.htm · Sequence: 1

isba-20260723

0000842517false00008425172026-07-232026-07-23

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): July 23, 2026

ISABELLA BANK CORPORATION

(Exact name of registrant as specified in its charter)

Michigan 000-18415   38-2830092

(State or other jurisdiction

of incorporation) (Commission

File Number)   (IRS Employer

Identification No.)

401 North Main Street Mt. Pleasant Michigan   48858-1649

(Address of principal executive offices)   (Zip Code)

Registrant’s telephone number, including area code: (989) 772-9471

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 l4a-12 under the Exchange Act (17 CFR 240.l4a-l2)

☐ Pre-commencement communications pursuant to Rule l4d-2(b) under the Exchange Act (17 CFR 240.l4d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.l3e-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, no par value per share ISBA

The Nasdaq Stock Market LLC

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. ☐

Section 2 - Financial Information

Item 2.02 Results of Operations and Financial Condition.

On July 23, 2026, Isabella Bank Corporation issued a press release announcing its financial results for the quarter ended June 30, 2026.

A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

In accordance with General Instruction B.2 of Form 8-K, the information in Item 2.02 of this Current Report on Form 8-K, including Exhibit 99.1 furnished herewith, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor will any of such information be deemed incorporated by reference into any filing made by the registrant under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing or document.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits:

Exhibit

No. Description

99.1

Press release issued by Isabella Bank Corporation, dated July 23, 2026

104 Cover page interactive data file - the cover page XBRL tags are embedded within the inline XBRL document

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.

ISABELLA BANK CORPORATION

Dated: July 23, 2026   By:   /s/ Gerald J. Ritzert

Gerald J. Ritzert, Chief Financial Officer

EX-99.1

EX-99.1

Filename: earningsrelease_20260630xe.htm · Sequence: 2

Document

Exhibit 99.1

Isabella Bank Corporation Reports Second Quarter 2026 Earnings

MT. PLEASANT, MICHIGAN — July 23, 2026 — Isabella Bank Corporation (Nasdaq: ISBA) (“Isabella” or the “Company”) reported net income of $5.0 million, or $0.69 per diluted share, for the second quarter 2026 compared to $5.0 million, or $0.68 per diluted share, for the second quarter 2025.

SECOND QUARTER 2026 HIGHLIGHTS

•Loans grew $30.7 million during the quarter

•Net interest margin (NIM) improved to 3.54%, up from 3.14% in second quarter 2025

•Merger agreement signed with Grand River Commerce, Inc. and its banking subsidiary, Grand River Bank

•Launched a successful at-the-market stock offering, increasing equity by $11.7 million

•Added to the Russell 2000® Index

“Isabella Bank Corporation had another strong quarter, driven by continued loan growth and margin expansion,” said CEO Jerome Schwind. “We also had a series of important events during the quarter aligned with our long-term strategy that will fuel our continued disciplined growth.

“We announced an agreement to acquire Grand River Commerce and Grand River Bank,” Schwind added. “We believe this acquisition will enable us to enter the fast-growing Grand Rapids market with a strong portfolio and customer base. We look forward to welcoming the customers of Grand River Bank to the Isabella Bank family upon completion of the proposed transaction.

“We also launched a successful at-the-market offering of our common stock and were added to the Russell 2000® Index in June. In May, we celebrated one year of being listed on Nasdaq by ringing the closing bell,” he added.

FINANCIAL CONDITION (June 30, 2026 to December 31, 2025 comparison)

Total assets increased $10.2 million, or 0.5%, to $2.2 billion as of June 30, 2026. This increase was primarily due to an increase of $53.3 million in loans and an increase of $15.7 million in cash and cash equivalents. These increases were offset by a $58.5 million decline in available-for-sale (AFS) securities.

The AFS securities portfolio decreased $58.5 million, or 11.8%, to $439.3 million as of June 30, 2026. The decrease was a result of maturities and principal paydowns of $121.8 million, offset by $64.4 million in purchases. Net unrealized losses on AFS securities were $10.8 million as of June 30, 2026, compared to $9.9 million at December 31, 2025. Net unrealized losses as a percentage of the amortized cost of AFS securities were consistent compared to December 31, 2025, at 2%.

Loans increased $53.3 million, or 3.5%, to $1.6 billion as of June 30, 2026, primarily by growth in the commercial real estate and residential real estate portfolios of $33.5 million and $22.1 million, respectively. Most residential originations were adjustable rate products, which are retained on the balance sheet rather than sold in the secondary market. The consumer loan portfolio continues to decrease amid declining demand, competition, and adherence to credit quality standards.

The allowance for credit losses (ACL) increased $752,000, or 5.5%, to $14.5 million as of June 30, 2026. The increase is due to loan growth and an increase in loss rates driven by loans charged off during the year. Nonaccrual loans were $7.8 million as of June 30, 2026 compared to $4.6 million at December 31, 2025. Past due and accruing accounts between 30 to 89 days as a percentage of total loans was 0.06% at June 30, 2026, compared to 0.44% at year-end 2025.

Total deposits decreased $9.7 million, or 0.5%, to $1.8 billion as of June 30, 2026. The decline was a result of a $20.7 million decline in certificates of deposit, a $14.0 million decline in interest bearing demand deposits, and a $12.3 million decline in noninterest bearing demand deposits. These declines were offset by a $20.4 million increase in savings deposits and a $16.8 million increase in money market accounts.

Total equity was $248.7 million, or $32.60 per share, at June 30, 2026 compared to $231.4 million, or $31.60 per share, as of December 31, 2025. The increase in total equity is primarily due to the issuance of 303,371 shares as part of the previously announced at-the-market stock offering, increasing total equity by $11.7 million. Tangible book value per share (non-GAAP) was $26.27 as of June 30, 2026, compared to $25.01 as of December 31, 2025. Net unrealized losses in the AFS securities portfolio reduced tangible book value per share (non-GAAP) by $1.14 and $1.09 for the respective periods.

RESULTS OF OPERATIONS (for the three and six months ended June 30, 2026, and 2025, unless otherwise noted)

Net income for the three months ended June 30, 2026 was $5.0 million, or $0.69 per diluted share, compared with $5.0 million, or $0.68 per diluted share, for the three months ended June 30, 2025. Net income for the six months ended June 30, 2026 was $10.0 million, or $1.37 per diluted share, compared with $9.0 million, or $1.21 per diluted share, for the six months ended June 30, 2025.

Net interest income was $18.1 million for the three months ended June 30, 2026 and $15.1 million for the three months ended June 30, 2025, representing 3.54% and 3.14% of earning assets, or NIM on a fully tax equivalent basis (non-GAAP), respectively. The book yield from securities was 2.82% and 2.38% for the three months ended June 30, 2026 and 2025, respectively. The yield on loans increased to 5.86% for the three months ended June 30, 2026 from 5.71% for the three months ended June 30, 2025. The increase in loan yields was primarily due to higher rates on new loans and variable rate commercial loans that continue to reprice. The cost of interest-bearing liabilities for the three months ended June 30, 2026 decreased to 2.09% from 2.24% for the three months ended June 30, 2025 primarily due to lower rates on money market and certificate of deposit products.

Net interest income was $35.0 million for the six months ended June 30, 2026 and $29.7 million for the six months ended June 30, 2025, representing 3.43% and 3.10% of earning assets, or NIM on a fully tax equivalent basis (non-GAAP), respectively. The book yield from securities was 2.67% and 2.31% for the six months ended June 30, 2026 and 2025, respectively. The yield on loans increased to 5.82% for the six months ended June 30, 2026 from 5.72% for the six months ended June 30, 2025. The increase in loan yields was primarily due to higher rates on new loans and variable rate commercial loans that continue to reprice. The cost of interest-bearing liabilities for the six months ended June 30, 2026 decreased to 2.12% from 2.25% for the six months ended June 30, 2025 primarily due to lower rates on money market and certificate of deposit products.

The provision for credit losses was $895,000 for the three months ended June 30, 2026, driven by a $465,000 increase in the ACL on loans and net charge offs totaling $384,000. The provision for credit losses for the three months ended June 30, 2025 was a credit of $1.1 million, which reflects $1.4 million in net recoveries, offset by a $242,000 increase in the ACL on loans and an increase in the reserve for unfunded commitments. Recoveries of $1.6 million during second quarter 2025 were related to overdrawn deposit accounts from a single customer that were charged off during the third quarter of 2024.

The provision for credit losses was $1.5 million for the six months ended June 30, 2026, as compared to a credit of $1.2 million for the six months ended June 30, 2025. Net charge offs for the six months ended June 30, 2026 totaled $637,000, while there were net recoveries of $1.5 million for the six months ended June 30, 2025.

Noninterest income for the three months ended June 30, 2026 and 2025 was $4.4 million and $3.7 million, respectively. Service charges and fees increased $479,000 as a result of internal initiatives designed to align fees with the market. Earnings on bank-owned life insurance (BOLI) policies increased $134,000 compared to second quarter 2025 due to additional investments in a separate account BOLI in 2025. Wealth management fees grew $132,000 due to growth in assets under management since second quarter 2025.

Noninterest income for the six months ended June 30, 2026 and 2025 was $8.7 million and $7.2 million, respectively. Service charges and fees increased $877,000 as a result of internal initiatives designed to align fees with the market. Wealth management fees grew $261,000 due to growth in assets under management. Earnings on BOLI policies increased $210,000 due to additional investments in a separate account BOLI in 2025. Other noninterest income in 2026 includes a $137,000 gain related to a death benefit from a BOLI policy.

Noninterest expenses for the three months ended June 30, 2026 and 2025 were $15.4 million and $13.7 million, respectively. Compensation and benefit expenses increased $651,000, reflecting annual merit increases, incentives, and higher medical insurance claims. Occupancy and equipment increased $240,000 and merger-related expenses of $505,000 were included in noninterest expenses in second quarter 2026.

Noninterest expenses for the six months ended June 30, 2026 and 2025 were $30.0 million and $27.0 million, respectively. Compensation and benefit expenses increased $1.2 million for the same reasons as the quarterly comparison. Occupancy and equipment expenses increased $480,000 and merger-related expenses during second quarter 2026 totaled $505,000.

Income tax expense for both of the three months ended June 30, 2026 and 2025 was $1.1 million, while the effective tax rate (ETR) was 18% for both periods. Income tax expense for both of the six months ended June 30, 2026 and 2025 was $2.1 million, while the ETR was 17% for the six months ended June 30, 2026 and 19% for the six months ended June 30, 2025. The ETR in the first six months of 2025 included a one-time tax expense totaling $166,000 due to the taxes owed from the lifetime earnings on BOLI policies that were surrendered during first quarter 2025. Excluding the one-time charge, the ETR was 17% for the first six months of 2025.

About Isabella Bank Corporation

Isabella Bank Corporation (Nasdaq: ISBA) is the parent holding company of Isabella Bank, a state-chartered community bank headquartered in Mt. Pleasant, Michigan. Isabella Bank was established in 1903 and has been committed to serving its customers’ and communities’ local banking needs for over 120 years. The Bank offers personal and commercial lending and deposit products, as well as investment, trust, and estate planning services. The Bank has locations throughout eight Mid-Michigan counties: Bay, Clare, Gratiot, Isabella, Mecosta, Midland, Montcalm, and Saginaw.

For more information about Isabella Bank Corporation, visit the Investor Relations link at www.isabellabank.com.

Contact

Lori Peterson, Director of Marketing

Phone: 989-779-6333 Fax: 989-775-5501

Available Information

The Company maintains an Internet web site at ir.isabellabank.com/overview. The Company makes available, free of charge, on its web site the Company’s annual reports, quarterly earnings reports, and other press releases.

The Company routinely posts important information for investors on its website (www.isabellabank.com and, more specifically, under the News tab at ir.isabellabank.com/news). The Company intends to use its web site as a means of disclosing material non-public information and for complying with its disclosure obligations under Regulation FD (Fair Disclosure) promulgated by the U.S. Securities and Exchange Commission (the “SEC”). Accordingly, investors should monitor the Company’s web site, in addition to following the Company’s press releases, SEC filings, public conference calls, presentations and webcasts.

The information contained on, or that may be accessed through, the Company’s website is not incorporated by reference into, and is not a part of, this document.

Forward-Looking Statements

Information in this press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended and Rule 3b-6 promulgated thereunder. The Company intends such forward looking statements to be covered by the safe harbor provisions for forward looking statements contained in the Private Securities Litigation Reform Act of 1995, and are included in this statement for purposes of these safe harbor provisions. Forward-looking statements generally relate to losses, impact of events, financial condition, plans, objectives, outlook for earnings, revenues, expenses, capital and liquidity levels and ratios, asset levels, asset quality, financial position, and other matters regarding or affecting the Company and its future business and operations. Forward-looking statements are typically identified by words or phrases such as “will likely result”, “expect”, “could”, “may”, “plan”, “believe”, “estimate”, “anticipate”, “strategy”, “trend”, “forecast”, “outlook”, “project”, “intend”, “assume”, “outcome”, “continue”, “remain”, “potential”, “opportunity”, “current”, “position”, “maintain”, “sustain”, “seek”, “achieve” and variations of such words and similar expressions, or future or conditional verbs such as will, would, should, could or may. Factors that could cause such differences include, but are not limited to: (i) uncertainty or perceived instability in the banking industry as a whole; (ii) increased competition for deposits among traditional and nontraditional financial services companies, and related changes in deposit customer behavior; (iii) the persistent inflationary pressures in the United States, and its impact on market interest rates, the labor market, the economy as a whole, and credit quality; (iv) elevated asset prices; (iv) the Company’s ability to effectively execute its expansion strategy and manage its growth, including identifying and consummating suitable acquisitions; (v) risks relating to the proposed acquisition of of Grand River including, without limitation: the timing of consummation of the proposed transaction between Isabella and Grand River; the risk that any condition to closing of the proposed acquisition may not be satisfied or waived; the risk that the Merger may not be completed at all; the diversion of management time on issues related to the proposed acquisition; the expected impact of the proposed acquisition and on the combined entities’ operations, financial condition, and financial results; the businesses of Isabella and Grand River may not be combined successfully, or such combination may take longer to accomplish than expected; the cost savings from the proposed acquisition may not be fully realized or may take longer to realize than expected; operating costs, customer loss and business disruption following the proposed acquisition, including adverse effects on relationships with employees, may be greater than expected; the risk of deposit and customer attrition; increased competitive pressures on solicitations of customers by competitors; regulatory approvals of the proposed acquisition may not be obtained, or adverse conditions may be imposed in connection with regulatory approvals of the proposed acquisition; and the risk that the Grand River shareholders may not approve the proposed acquisition; (vi) risks associated with concentrations of the Company’s business in market areas, loans secured by real estate, and public funds deposits as a percentage of total deposits; (vii) adverse changes in customer spending, borrowing, and savings habits; (viii) risks associated with the Company’s commercial loan portfolio and agricultural loan portfolio; (ix) risks related to the significant amount of credit that the Company has extended to a limited number of borrowers and in a limited geographic area; (x) damage to the Company’s reputation resulting from adverse publicity, regulatory actions, litigation, operational failures, and the failure to meet client expectations and other facts; (xi) the Company’s ability to keep pace with technological change or difficulties that may experienced when implementing new technologies; (xii) cybersecurity risk, including cyber incidents or other failures, disruptions or breaches of the Company’s operational or security systems or infrastructure, or those of third-party vendors or other service providers, including as a result of a cyber-attack; (xiii) costs and effects of litigation, investigations or similar matters to which the Company may be subject; (xiv) natural disasters, severe weather, acts of god, military conflicts (including the conflicts in the Middle East, the possible expansion of such conflicts and potential geopolitical and economic consequences), acts of terrorism, domestic civil unrest, geopolitical instability, public health outbreaks (such as coronavirus), other international or domestic calamities, and other events beyond the Company’s control, including as a result of in the policies of the current U.S. presidential administration or Congress; (xv) the impacts of tariffs, sanctions and other trade policies of the United States and its global trading counterparts and the resulting impact on the Company and its customers; (xvi) compliance with

governmental and regulatory requirements, including the Dodd-Frank Act Wall Street Reform and Consumer Protection Act, Economic Growth, Regulatory Relief, and Consumer Protection Act of 2018, and others relating to banking, consumer protection, securities and tax matters; (xvii) changes in accounting principles and standards; (xviii) changes in the laws, rules, regulations, interpretations or policies that apply to the Company’s business and operations, and any additional regulations, or repeals that may be forthcoming as a result thereof, which could cause the Company to incur additional costs and adversely affect the Company’s business environment, operations and financial results; and (xix) the Company’s ability to navigate the uncertain impacts of current and future governmental monetary and fiscal policies, including the current and future policies of the Board of Governors of the Federal Reserve System and as a result of initiatives of the Trump administration. These forward-looking statements are based on current information and/or management’s good faith belief as to future events. Although the Company believes the assumptions upon which these forward-looking statements are based are reasonable, any of these assumptions could prove to be inaccurate and the forward-looking statements based on these assumptions could be incorrect. Therefore, the Company can give no assurance that the results contemplated in the forward-looking statements will be realized. Additional information regarding risks and uncertainties to which the Company’s business and future financial performance are subject is contained in the Company’s most recent Annual Report on Form 10-K and Quarterly Reports on Form 10-Q on file with the SEC, including the sections entitled “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of such documents, and other documents the Company files or furnishes with the SEC from time to time, which are available on the SEC’s website, www.sec.gov. Due to these and other possible uncertainties and risks, the Company cautions you not to unduly rely on forward-looking statements. The inclusion of this forward-looking information should not be construed as a representation by the Company or by any person that the future events, plans or expectations contemplated by the Company will be achieved. All subsequent written and oral forward-looking statements attributable to the Company or any person acting on its behalf are expressly qualified in their entirety by the cautionary statements above. Any forward-looking statement speaks only as to the date on which it is made, and the Company undertakes no obligation to update any forward-looking statement to reflect developments occurring after the statement is made, except as required by law. All forward-looking statements, express or implied, included in the press release are qualified in their entirety by this cautionary statement.

Non-GAAP Financial Measures

Some of the financial measures included in this press release are not measures of financial performance recognized in accordance with generally accepted accounting principles in the United States (“GAAP”). The Company believes these non-GAAP financial measures provide both management and investors with a more complete understanding of the Company’s financial position and performance. These non-GAAP financial measures are supplemental and are not a substitute for any analysis based on GAAP financial measures.

The Company classifies a financial measure as being a non-GAAP financial measure if that financial measure excludes or includes amounts, or is subject to adjustments that have the effect of excluding or including amounts, that are included or excluded, as the case may be, in the most directly comparable measure calculated and presented in accordance with GAAP as in effect from time to time in the United States in the statements of income, balance sheets or statements of cash flows. Not all companies use the same calculation of these measures; therefore, this presentation may not be comparable to other similarly titled measures as presented by other companies.

A reconciliation of non-GAAP financial measures to GAAP financial measures is provided at the end of this press release.

Table Index Consolidated Financial Schedules (Unaudited)

A Selected Financial Data

B Consolidated Balance Sheets

C Consolidated Statements of Income

D

Average Balances, Interest Rate, and Net Interest Income

E

Average Balances, Interest Rate, and Net Interest Income (continued)

F

Reconciliation of Non-GAAP Financial Measures

SELECTED FINANCIAL DATA (UNAUDITED)

The following table outlines selected financial data as of, and for the:

Three Months Ended Six Months Ended

(dollars in thousands, except per share amounts) June 30,

2026 March 31,

2026 December 31,

2025 September 30,

2025 June 30,

2025 June 30,

2026 June 30,

2025

PER SHARE

Basic earnings $ 0.69 $ 0.68 $ 0.64 $ 0.71 $ 0.68 $ 1.37  $ 1.21

Diluted earnings 0.69 0.68 0.64 0.71 0.68 1.37  1.21

Dividends 0.28 0.28 0.28 0.28 0.28 0.56  0.56

Book value (1)

32.60 31.90 31.60 30.94 29.95 32.60  29.95

Tangible book value (1) (2)

26.27 25.32 25.01 24.37 23.39 26.27  23.39

Market price (1)

39.50 45.67 50.00 35.25 30.15 39.50  30.15

Common shares outstanding (1) (3)

7,628,809 7,333,319 7,322,207 7,350,567 7,361,684 7,628,809 7,361,684

Average number of diluted common shares outstanding (3)

7,337,378 7,329,058 7,345,610 7,371,652 7,398,109 7,332,078 7,413,974

PERFORMANCE RATIOS

Return on average total assets 0.91% 0.91% 0.85% 0.94% 0.96% 0.91% 0.87%

Return on average shareholders’ equity 8.50% 8.58% 8.04% 9.28% 9.19% 8.54% 8.35%

Return on average tangible shareholders’ equity (2)

10.66% 10.79% 10.16% 11.83% 11.78% 10.72% 10.74%

Net interest margin yield (fully taxable equivalent) (1) (2)

3.54% 3.33% 3.28% 3.15% 3.14% 3.43% 3.10%

Efficiency ratio (2)

67.84% 68.50% 65.02% 67.62% 72.14% 68.16% 72.26%

Loan to deposit ratio (1)

87.83% 83.82% 84.43% 74.36% 75.57% 87.83% 75.57%

Shareholders’ equity to total assets (1)

11.20% 10.39% 10.47% 10.06% 10.23% 11.20% 10.23%

Tangible shareholders’ equity to tangible assets (1)

9.23% 8.43% 8.47% 8.10% 8.17% 9.23% 8.17%

ASSETS UNDER MANAGEMENT

Wealth assets under

management (1)

750,840 701,510 707,118 679,724 678,959 750,840 678,959

ASSET QUALITY

Nonaccrual loans (1)

7,790 4,418 4,578 3,443 1,164 7,790  1,164

Foreclosed assets (1)

620 573 938 1,018 667 620  667

Net loan charge-offs (recoveries) 384 253 34 74 (1,432) 637  (1,484)

Net loan charge-offs (recoveries) to average loans outstanding 0.02% 0.02% 0.00% 0.01% (0.10%) 0.04% (0.11%)

Nonperforming loans to total loans (1)

0.49% 0.28% 0.30% 0.24% 0.09% 0.49% 0.09%

Nonperforming assets to total assets (1)

0.38% 0.22% 0.25% 0.20% 0.09% 0.38% 0.09%

Allowance for credit losses to loans (1)

0.91% 0.90% 0.89% 0.92% 0.93% 0.91% 0.93%

CAPITAL RATIOS (1)

Tier 1 leverage 9.59% 8.89% 8.84% 8.71% 9.04% 9.59% 9.04%

Common equity tier 1 capital 12.34% 11.71% 11.73% 12.37% 12.46% 12.34% 12.46%

Tier 1 risk-based capital 12.34% 11.71% 11.73% 12.37% 12.46% 12.34% 12.46%

Total risk-based capital 14.63% 14.01% 14.41% 15.20% 15.34% 14.63% 15.34%

(1) At end of period

(2) Non-GAAP financial measure; refer to the Reconciliation of Non-GAAP Financial Measures (Unaudited) in table F

(3) Whole shares

A

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(dollars in thousands) June 30,

2026 March 31,

2026 December 31,

2025 September 30,

2025 June 30,

2025

ASSETS

Cash and cash equivalents $ 41,774  $ 50,105  $ 26,041  $ 161,301  $ 108,554

Marketable securities available-for-sale, at fair value 439,289  492,744  497,791  511,970  500,560

Mortgage loans held-for-sale 410  360  423  737  55

Commercial and industrial 231,590  225,369  220,450  218,132  207,719

Commercial real estate 673,271  660,643  639,758  626,642  614,383

Advances to mortgage brokers 75,159  72,083  76,676  5,056  3,005

Agricultural 97,462  96,969  102,109  97,794  96,842

Residential real estate 449,992  438,333  427,880  412,056  398,668

Consumer 62,198  65,544  69,491  72,225  76,896

Loans held for investment 1,589,672  1,558,941  1,536,364  1,431,905  1,397,513

Allowance for credit losses 14,479  14,014  13,727  13,149  12,977

Loans, net 1,575,193  1,544,927  1,522,637  1,418,756  1,384,536

Federal Home Loan Bank stock, at cost 5,600  5,600  5,600  5,600  5,600

Premises and equipment 28,894  29,064  29,000  28,659  28,171

Cash surrender value of bank-owned life insurance policies 46,603  46,173  46,133  45,651  45,774

Goodwill and other intangible assets 48,282  48,282  48,282  48,282  48,282

Other assets 33,596  34,701  33,541  38,698  34,636

Total assets $ 2,219,641  $ 2,251,956  $ 2,209,448  $ 2,259,654  $ 2,156,168

LIABILITIES AND SHAREHOLDERS’ EQUITY

Liabilities

Noninterest bearing demand deposits $ 414,018  $ 411,216  $ 426,342  $ 421,027  $ 493,477

Interest bearing demand deposits 252,149  263,954  266,187  248,666  223,376

Money market deposits 453,478  477,544  436,631  558,212  446,845

Savings 300,867  300,732  280,429  292,899  289,746

Certificates of deposit 389,401  406,399  410,065  404,798  395,932

Total deposits 1,809,913  1,859,845  1,819,654  1,925,602  1,849,376

Short-term borrowings 116,012  113,530  68,000  62,022  43,208

Federal Home Loan Bank advances —  —  45,000  —  —

Subordinated debt, net of unamortized issuance costs 29,559  29,537  29,514  29,492  29,469

Total borrowed funds 145,571  143,067  142,514  91,514  72,677

Other liabilities 15,453  15,083  15,884  15,118  13,615

Total liabilities 1,970,937  2,017,995  1,978,052  2,032,234  1,935,668

Shareholders’ equity

Common stock 135,079  123,251  123,204  124,284  124,607

Shares to be issued for deferred compensation obligations 2,532  2,522  2,366  2,373  2,331

Retained earnings 119,844  116,790  113,849  111,172  107,949

Accumulated other comprehensive loss (8,751) (8,602) (8,023) (10,409) (14,387)

Total shareholders’ equity 248,704  233,961  231,396  227,420  220,500

Total liabilities and shareholders’ equity $ 2,219,641  $ 2,251,956  $ 2,209,448  $ 2,259,654  $ 2,156,168

B

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

Three Months Ended Six Months Ended

(dollars in thousands, except per share amounts) June 30,

2026 March 31,

2026 December 31,

2025 September 30,

2025 June 30,

2025 June 30,

2026 June 30,

2025

Interest income

Loans, including fees $ 22,607  $ 21,464  $ 21,669  $ 20,583  $ 19,832  $ 44,071  $ 39,180

Available-for-sale securities

Taxable 2,902  2,489  2,539  2,478  2,513  5,391  4,616

Nontaxable 470  499  509  516  519  969  1,059

Federal Home Loan Bank stock, at cost 64  75  63  70  125  139  285

Federal funds sold and other 173  602  498  1,235  253  775  735

Total interest income 26,216  25,129  25,278  24,882  23,242  51,345  45,875

Interest expense

Deposits 6,778  7,112  7,380  8,012  7,391  13,890  14,854

Short-term borrowings 1,007  736  587  441  324  1,743  665

Federal Home Loan Bank advances 43  133  317  —  132  176  170

Subordinated debt 304  266  266  267  266  570  532

Total interest expense 8,132  8,247  8,550  8,720  8,113  16,379  16,221

Net interest income 18,084  16,882  16,728  16,162  15,129  34,966  29,654

Provision for (reversal of) credit losses 895  604  434  209  (1,099) 1,499  (1,206)

Net interest income after provision for credit losses 17,189  16,278  16,294  15,953  16,228  33,467  30,860

Noninterest income

Service charges and fees 2,550  2,372  2,461  2,352  2,071  4,922  4,045

Wealth management fees 1,216  1,108  1,110  1,074  1,084  2,324  2,063

Income from bank-owned life insurance policies 434  448  485  468  300  882  672

Net gain on sale of mortgage loans 15  33  65  38  47  48  77

Other 160  400  323  376  184  560  357

Total noninterest income 4,375  4,361  4,444  4,308  3,686  8,736  7,214

Noninterest expenses

Compensation and benefits 8,147  7,928  7,532  7,630  7,496  16,075  14,879

Occupancy and equipment 2,890  2,840  2,663  2,628  2,650  5,730  5,250

Other professional services 807  1,015  815  851  863  1,822  1,574

ATM and debit card fees 629  558  575  595  555  1,187  1,041

Marketing 514  506  547  514  469  1,020  928

FDIC insurance premiums 288  306  339  271  267  594  570

Merger-related expenses 505  —  —  —  —  505  —

Other 1,606  1,509  1,450  1,496  1,445  3,115  2,802

Total noninterest expenses 15,386  14,662  13,921  13,985  13,745  30,048  27,044

Income before income tax expense 6,178  5,977  6,817  6,276  6,169  12,155  11,030

Income tax expense 1,137  985  2,127  1,036  1,138  2,122  2,050

Net income $ 5,041  $ 4,992  $ 4,690  $ 5,240  $ 5,031  $ 10,033  $ 8,980

Earnings per common share

Basic $ 0.69  $ 0.68  $ 0.64  $ 0.71  $ 0.68  $ 1.37  $ 1.21

Diluted 0.69  0.68  0.64  0.71  0.68  1.37  1.21

Cash dividends per common share 0.28  0.28  0.28  0.28  0.28  0.56  0.56

C

AVERAGE BALANCES, INTEREST RATE, AND NET INTEREST INCOME (UNAUDITED)

The following schedules present the daily average amount outstanding for each major category of interest earning assets, nonearning assets, interest bearing liabilities, and noninterest bearing liabilities. These schedules also present an analysis of interest income and interest expense for the periods indicated. All interest income is reported on a fully tax equivalent (FTE) basis using a federal income tax rate of 21%. Loans in nonaccrual status, for the purpose of the following computations, are included in the average loan balances. Federal Reserve Bank (FRB) restricted equity holdings are included in other interest earning assets.

Three Months Ended

June 30, 2026 March 31, 2026 June 30, 2025

(dollars in thousands) Average

Balance Tax

Equivalent

Interest Average

Yield /

Rate Average

Balance Tax

Equivalent

Interest Average

Yield /

Rate Average

Balance Tax

Equivalent

Interest Average

Yield /

Rate

INTEREST EARNING ASSETS

Loans (1)

$ 1,544,323 $ 22,607  5.86 % $ 1,501,654  $ 21,464  5.78 % $ 1,388,684  $ 19,832  5.71 %

AFS securities (2)

Taxable 432,520  2,902  2.69 % 430,376  2,489  2.35 % 461,483  2,513  2.18 %

Nontaxable (3)

63,607  600  3.78 % 67,878  637  3.81 % 72,869  697  3.84 %

Federal Home Loan Bank stock, at cost 5,600  64  4.55 % 5,600  75  5.36 % 5,600  125  8.94 %

Federal funds sold 2  —  3.67 % 7  —  3.54 % 6  —  3.83 %

Other (4)

18,079  173  3.81 % 64,190  602  3.75 % 20,487  253  4.92 %

Total interest earning assets (3)

2,064,131  26,346  5.12 % 2,069,705  25,267  4.94 % 1,949,129  23,420  4.81 %

NONEARNING ASSETS

Allowance for credit losses (14,078) (13,680) (13,369)

Cash and demand deposits due from banks 22,544  23,113  22,026

Premises and equipment 29,086  29,110  28,306

Other assets 116,913  116,639  106,595

Total assets $ 2,218,596  $ 2,224,887  $ 2,092,687

INTEREST BEARING LIABILITIES

Interest bearing demand deposits $ 257,088  205  0.32 % $ 266,101  294  0.45 % $ 236,076  220  0.37 %

Money market deposits 452,737  2,625  2.33 % 464,438  2,719  2.37 % 449,110  2,857  2.55 %

Savings 302,375  503  0.67 % 291,413  488  0.68 % 286,434  544  0.76 %

Certificates of deposit 396,481  3,445  3.49 % 407,483  3,611  3.59 % 395,450  3,770  3.82 %

Short-term borrowings 115,713  1,007  3.49 % 86,885  736  3.44 % 41,661  324  3.11 %

Federal Home Loan Bank advances 4,396  43  3.86 % 13,444  133  3.96 % 11,539  132  4.53 %

Subordinated debt, net of unamortized issuance costs

29,545  304  4.11 % 29,522  266  3.61 % 29,455  266  3.61 %

Total interest bearing liabilities 1,558,335  8,132  2.09 % 1,559,286  8,247  2.14 % 1,449,725  8,113  2.24 %

NONINTEREST BEARING LIABILITIES AND SHAREHOLDERS’ EQUITY

Demand deposits 404,805  411,011  409,262

Other liabilities 17,462  18,653  14,158

Shareholders’ equity 237,994  235,937  219,542

Total liabilities and shareholders’ equity $ 2,218,596  $ 2,224,887  $ 2,092,687

Net interest income (FTE) (5)

$ 18,214  $ 17,020  $ 15,307

Net yield on interest earning assets (FTE) (5)

3.54 % 3.33 % 3.14 %

(1) Includes loans held-for-sale and nonaccrual loans

(2) Average balances for available-for-sale (AFS) securities are based on amortized cost

(3) Includes FTE adjustments of $130,000, $138,000, and $178,000, respectively

(4) Includes average interest bearing deposits with other banks, net of Federal Reserve daily cash letter

(5) Non-GAAP financial measure; refer to the Reconciliation of Non-GAAP Financial Measures (Unaudited) in table F

D

Six Months Ended

June 30, 2026 June 30, 2025

(dollars in thousands) Average Balance Tax Equivalent Interest Average Yield/Rate Average Balance Tax Equivalent Interest Average Yield/Rate

INTEREST EARNING ASSETS

Loans (1)

$ 1,523,109  $ 44,071  5.82 % $ 1,379,774  $ 39,180  5.72 %

AFS securities (2)

Taxable 431,452  5,391  2.52 % 449,919  4,616  2.07 %

Nontaxable (3)

65,731  1,237  3.80 % 74,551  1,421  3.84 %

Federal Home Loan Bank stock, at cost 5,600  139  4.95 % 8,291  285  6.89 %

Federal funds sold 5  —  3.57 % 5  —  4.03 %

Other (4)

41,006  775  3.76 % 33,856  735  4.32 %

Total interest earning assets (3)

2,066,903  51,613  5.03 % 1,946,396  46,237  4.78 %

NONEARNING ASSETS

Allowance for credit losses (13,881) (13,127)

Cash and demand deposits due from banks 22,825  22,956

Premises and equipment 29,098  28,134

Other assets 116,776  104,770

Total assets $ 2,221,721  $ 2,089,129

INTEREST BEARING LIABILITIES

Interest bearing demand deposits $ 261,570  499  0.38 % $ 238,455  462  0.39 %

Money market deposits 458,556  5,344  2.35 % 454,855  5,786  2.56 %

Savings 296,925  991  0.67 % 286,399  1,082  0.76 %

Certificates of deposit 401,952  7,056  3.54 % 391,657  7,524  3.87 %

Short-term borrowings 101,378  1,743  3.47 % 42,607  665  3.15 %

Federal Home Loan Bank advances 8,895  176  3.93 % 7,459  170  4.53 %

Subordinated debt, net of unamortized issuance costs

29,534  570  3.86 % 29,444  532  3.62 %

Total interest bearing liabilities 1,558,810  16,379  2.12 % 1,450,876  16,221  2.25 %

NONINTEREST BEARING LIABILITIES AND SHAREHOLDERS’ EQUITY

Demand deposits 407,890  406,160

Other liabilities 18,051  15,200

Shareholders’ equity 236,970  216,893

Total liabilities and shareholders’ equity $ 2,221,721  $ 2,089,129

Net interest income (FTE) (5)

$ 35,234  $ 30,016

Net yield on interest earning assets (FTE) (5)

3.43 % 3.10 %

(1) Includes loans held-for-sale and nonaccrual loans

(2) Average balances for available-for-sale (AFS) securities are based on amortized cost

(3) Includes FTE adjustments of $268,000 and $362,000, respectively

(4) Includes average interest bearing deposits with other banks, net of Federal Reserve daily cash letter

(5) Non-GAAP financial measure; refer to the Reconciliation of Non-GAAP Financial Measures (Unaudited) in table F

E

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES (UNAUDITED)

Three Months Ended Six Months Ended

(dollars in thousands, except per share amounts) June 30,

2026 March 31,

2026 December 31,

2025 September 30,

2025 June 30,

2025 June 30,

2026 June 30,

2025

Loans $ 1,589,672 $ 1,558,941 $ 1,536,364 $ 1,431,905 $ 1,397,513 $ 1,589,672  $ 1,397,513

Advances to mortgage brokers 75,159 72,083 76,676 5,056 3,005 75,159  3,005

Adjusted loans $ 1,514,513 $ 1,486,858 $ 1,459,688 $ 1,426,849 $ 1,394,508 $ 1,514,513  $ 1,394,508

Total shareholders’ equity $ 248,704 $ 233,961 $ 231,396 $ 227,420 $ 220,500 $ 248,704 $ 220,500

Goodwill and other intangible assets 48,282 48,282 48,282 48,282 48,282 48,282  48,282

Tangible equity (A) 200,422 185,679 183,114 179,138 172,218 200,422  172,218

Common shares outstanding (1)

(B) 7,628,809 7,333,319 7,322,207 7,350,567 7,361,684 7,628,809  7,361,684

Tangible book value per share (A/B) $ 26.27 $ 25.32 $ 25.01 $ 24.37 $ 23.39 $ 26.27  $ 23.39

Noninterest expenses $ 15,386 $ 14,662 $ 13,921 $ 13,985 $ 13,745 $ 30,048  $ 27,044

Amortization of acquisition intangibles — — — — — —  1

Adjusted noninterest expense (C) $ 15,386 $ 14,662 $ 13,921 $ 13,985 $ 13,745 $ 30,048  $ 27,043

Net interest income $ 18,084 $ 16,882 $ 16,728 $ 16,162 $ 15,129 $ 34,966  $ 29,654

Tax equivalent adjustment for net interest margin 130 138 138 144 178 268  362

Net interest income (FTE) 18,214 17,020 16,866 16,306 15,307 35,234  30,016

Noninterest income 4,375 4,361 4,444 4,308 3,686 8,736  7,214

Tax equivalent adjustment for BOLI 91 94 102 98 63 185  141

Adjusted revenue (FTE) 22,680 21,475 21,412 20,712 19,056 44,155  37,371

Net gains (losses) on foreclosed assets — 70 3 31 3 70  (52)

Adjusted revenue (D) $ 22,680 $ 21,405 $ 21,409 $ 20,681 $ 19,053 $ 44,085  $ 37,423

Efficiency ratio (C/D) 67.84% 68.50% 65.02% 67.62% 72.14% 68.16 % 72.26 %

(1) Whole shares

F

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Jul. 23, 2026

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ISABELLA BANK CORP

Entity Incorporation, State or Country Code

MI

Entity File Number

000-18415

Entity Tax Identification Number

38-2830092

Entity Address, Address Line One

401 North Main Street

Entity Address, City or Town

Mt. Pleasant

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MI

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