Form 8-K

8-K — T3 Defense Inc.

Accession: 0001213900-26-048280

Filed: 2026-04-28

Period: 2026-04-27

CIK: 0001787518

SIC: 8742 (SERVICES-MANAGEMENT CONSULTING SERVICES)

Item: Entry into a Material Definitive Agreement

Item: Unregistered Sales of Equity Securities

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — ea0287809-8k_t3defense.htm (Primary)

EX-10.53 — NOTE EXCHANGE AGREEMENT, DATED AS OF APRIL 27, 2026, BETWEEN T3 DEFENSE INC. AND MENACHEM SHALOM (ea028780901ex10-53.htm)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or Section 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):

April 27, 2026

T3 DEFENSE INC.

(Exact name of registrant as specified in its charter)

Delaware

001-39341

38-3912845

(State or other jurisdiction of

incorporation or

organization)

(Commission File Number)

(IRS Employer

Identification Number)

575 Fifth Avenue, 14th Floor

New York, New York 10017

(Address of principal executive offices)

212-791-4663

(Registrant’s telephone number, including

area code)

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 to 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, $0.0001 par value per share

DFNS

The Nasdaq Stock Market LLC

Warrants, each warrant exercisable for one Share of Common Stock for $92.00 per share

DFNSW

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 or Rule 12b-2 of the Securities Exchange Act of 1934.

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 Termination of a Material Definitive

Agreement.

On April 27, 2026, T3 Defense Inc. (the “Company”), and

Menachem Shalom, the Company’s Chief Executive Officer and a member of the Company’s Board of Directors (the “Board”),

executed and delivered the Note Exchange Agreement, pursuant to which the original principal amount of the notes issued to Mr. Shalom

and accrued interest thereon in the amount of $2,138,962 was cancelled in its entirety in exchange for the issuance of 4,174,399 shares

of common stock (the “Exchange Shares”). The exchange price of $0.5124 was the last consolidated bid price of a share of common

stock as reported by The Nasdaq Stock Market LLC. The Exchange Shares are restricted shares and may not be sold without registration or an applicable exemption therefrom.

The notes were assigned to Mr. Shalom from

Star 26 Capital Inc. (“Star 26”) pursuant to the terms of the Amended and Restated Securities Purchase Agreement and

Call Option dated September 15, 2025 (the “Star Purchase Agreement”) among the Company, Star 26 and the other parties

signatory thereto and pursuant to the exercise by Mr. Shalom of his right to obtain shares, notes and warrants from Esousa Group

Holdings LLC (“Esousa”) in accordance with the terms of the Call Option Agreement dated January 13, 2026.

The above description of the Note Exchange Agreement

does not purport to be complete and is qualified in its entirety by reference to the full text of said agreement, a copy of which is attached

hereto as Exhibit 10.53 and incorporated herein by reference.

Item 3.02 Unregistered Sales of Equity Securities.

The information set forth in Items 1.01 and 8.01

of this Current Report on Form 8-K regarding the issuance of the Exchange Shares is incorporated by reference into this Item 3.02. The

shares were issued in reliance upon the exemption from the registration requirements of the Securities Act of 1933, as amended (the “Securities

Act”), provided by Section 4(a)(2) of the Securities Act and/or Rule 506 of Regulation D promulgated thereunder. The Exchange Shares

bear restrictive legends as required under the Securities Act.

Item 8.01 Other Events.

On April 27, 2026, the Board resolved that Menachem Shalom, the Company CEO and the holder of the notes assigned to him by Star 26 (currently

aggregating $2,138,962 in outstanding principal) pursuant to the terms of the Star Purchase Agreement has the right to convert his notes

based on the last consolidated bid price as reported by The Nasdaq Stock Market LLC., or $0.5124 per share. On said date, the Board also

resolved to reduce the exercise price of the Star Warrant held by Menachem Shalom from $1.50 per share to $0.5124 per share. In connection

with the consummation of the transactions contemplated by the Star Purchase Agreement on January 12, 2026, the Company issued to Star 26 a warrant

to purchase a total of 12,017,648 shares of Common Stock at an exercise price of $1.50 per share (the “Star Warrant”), which

was then distributed to the equity holders of Star 26 on a pro rata basis. Mr. Shalom’s share is a warrant to purchase 7,175,662

shares of Common Stock.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.

Description

10.53

Note Exchange Agreement, dated as of April 27, 2026, between T3 Defense Inc. and Menachem Shalom

104

Cover Page Interactive Data File (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.

T3 DEFENSE INC.

Date: April 28, 2026

By:

/s/ Menachem Shalom

Name:

Menachem Shalom

Title:

Chief Executive Officer

EX-10.53 — NOTE EXCHANGE AGREEMENT, DATED AS OF APRIL 27, 2026, BETWEEN T3 DEFENSE INC. AND MENACHEM SHALOM

EX-10.53

Filename: ea028780901ex10-53.htm · Sequence: 2

Exhibit 10.53

NOTE EXCHANGE AGREEMENT

This Note Exchange Agreement

(this “Agreement”), dated as of April 27, 2026 (the “Effective Date”), is entered into by and between

T3 Defense Inc., a Delaware corporation formerly known as Nukkleus Inc. (the “Company”), and Menachem Shalom

(the “Holder”).

RECITALS

WHEREAS, the Board

of Directors of the Company has resolved that the outstanding notes issued and assigned to the Holder in connection

with the closing of the transactions contemplated by the Amended and Restated Securities Purchase Agreement and Call Option dated

September 15, 2025 (as amended, the “Star SPA”) among the Company, Star 26 Capital, Inc., a Nevada corporation

(“Star 26”) are convertible at the option of the Holder at a conversion price of $0.5124, the last

consolidated bid price as reported by The Nasdaq Stock Market LLC; and

WHEREAS, the Holder

hereby elects to convert all outstanding indebtedness of his 3-month promissory note (the “Three-Month Note”) in the

original principal amount of $254,791, and his 6-month promissory note (the “Six-Month Note”) in the original principal

amount of $1,841,209 plus accrued interest thereon of $42,962 (in the aggregate, the

“Notes”);

WHEREAS, the Company

and the Holder desire to cancel and extinguish the amounts of the Notes as provided above in exchange for the issuance to the Holder of

an aggregate of 4,174,399 shares of the Company’s common stock, par value $0.0001 per share (the “Common Stock”),

all on the terms and subject to the conditions set forth herein.

NOW, THEREFORE, in

consideration of the foregoing and the mutual covenants and agreements set forth herein, and for other good and valuable consideration,

the receipt and sufficiency of which are hereby acknowledged, the parties agree as follows:

1. CANCELLATION AND EXCHANGE OF NOTES

1.1 Cancellation. Effective

as of the Effective Date, the principal balance and any accrued interest reflected by the Notes, and all rights, obligations and liabilities

of the Company thereunder, including the obligation to repay the principal amount thereof and to pay any accrued and unpaid interest thereon,

are hereby automatically and irrevocably cancelled, discharged and extinguished in full. The Holder hereby releases and forever discharges

the Company from any and all obligations arising under or relating to the Notes.

1.2 Issuance of Exchange

Shares. In consideration of, and in exchange for, the cancellation of the Notes, the Company shall issue to the Holder, as of the

Effective Date, an aggregate of 4,174,399 shares of Common Stock (the “Shares”). The amount of Shares was determined

by (a) dividing the outstanding amounts of the Notes and all accrued interest thereon (consisting of $254,791 in outstanding principal

and accrued interest with respect to the Three-Month Note and $1,884,171 in outstanding principal and accrued interest with respect to

the Six-Month Note by (b) $0.5124, which is the consolidated bid price as reported by The Nasdaq Stock Market LLC on April 24, 2026.

1.3 Delivery. On the

Effective Date, (a) the Notes shall be deemed cancelled and no longer in force and effect, and (b) the Company shall instruct its transfer

agent to issue the Shares to the Holder in book-entry form.

1.4 Full Satisfaction.

The Holder acknowledges and agrees that the issuance of the Shares pursuant to this Agreement constitutes payment and satisfaction

in full of all amounts owed by the Company under the Notes, including all principal, accrued and unpaid interest, and any other amounts

payable thereunder.

2. REPRESENTATIONS AND WARRANTIES OF THE

HOLDER

The Holder represents and

warrants to the Company, as of the Effective Date, as follows:

2.1 Authority; Enforceability.

The Holder has full power, authority and legal capacity to execute, deliver and perform this Agreement. This Agreement has been duly

executed and delivered by the Holder and constitutes the legal, valid and binding obligation of the Holder, enforceable against the Holder

in accordance with its terms.

2.2 Ownership of Notes.

The Holder is the sole legal and beneficial owner of the Notes, free and clear of all liens, claims, encumbrances, adverse claims

and rights of any third parties. The Holder has not assigned, transferred, pledged or hypothecated any interest in the Notes to any other

person.

2.3 Investment Representations.

The Holder is acquiring the Shares for his own account, for investment purposes only, and not with a view to or for distribution or

resale in violation of the Securities Act of 1933, as amended (the “Securities Act”). The Holder understands that the

Shares have not been registered under the Securities Act or any applicable state securities laws, are being issued in reliance on the

exemption from registration provided by Section 4(a)(2) of the Securities Act, and constitute “restricted securities” within

the meaning of Rule 144 under the Securities Act.

2.4 Accredited Investor.

The Holder is an “accredited investor” within the meaning of Rule 501(a) of Regulation D promulgated under the Securities

Act.

2.5 Access to Information.

The Holder has access to all information regarding the Company and its subsidiaries that the Holder deems necessary to make an informed

investment decision with respect to the Shares, and has had the opportunity to ask questions of, and receive answers from, the Company’s

management.

2.6 Legend. The Holder

acknowledges that the Shares shall bear a restrictive legend substantially as follows:

“THE SECURITIES REPRESENTED HEREBY

HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE ‘ACT’), OR ANY APPLICABLE STATE SECURITIES LAWS.

THE SECURITIES MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER

THE ACT, OR PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE ACT, THE AVAILABILITY OF WHICH IS TO BE ESTABLISHED TO THE SATISFACTION

OF THE COMPANY.”

3. REPRESENTATIONS AND WARRANTIES OF THE

COMPANY

The Company represents and

warrants to the Holder, as of the Effective Date, as follows:

3.1 Authority; Enforceability.

The Company has full corporate power and authority to execute, deliver and perform this Agreement and to issue the Shares. This Agreement

has been duly authorized by all necessary corporate action on the part of the Company and constitutes the legal, valid and binding obligation

of the Company, enforceable against the Company in accordance with its terms.

3.2 Valid Issuance. When

issued and delivered in accordance with this Agreement, the Shares will be duly authorized, validly issued, fully paid and non-assessable,

and free and clear of all liens and encumbrances (other than restrictions on transfer imposed by applicable securities laws).

3.3 Sufficient Authorized

Shares. The Company has a sufficient number of shares of Common Stock authorized and available for issuance to permit the issuance

of the Shares in accordance with this Agreement.

4. MISCELLANEOUS

4.1 Further Assurances.

Each party shall execute and deliver such additional documents and take such further actions as the other party may reasonably request

to carry out the intent and purposes of this Agreement.

4.2 Entire Agreement. This

Agreement constitutes the entire agreement between the parties with respect to the subject matter hereof and supersedes all prior agreements

and understandings, whether written or oral, relating to such subject matter.

4.3 Amendment; Waiver.

This Agreement may be amended or modified only by a written instrument signed by both parties. No waiver of any provision of this

Agreement shall be effective unless in writing signed by the party against whom such waiver is sought to be enforced.

4.4 Governing Law. This

Agreement shall be governed by, and construed and enforced in accordance with, the laws of the State of New York, without giving effect

to any choice or conflict of law provision or rule thereof.

4.5 Counterparts. This

Agreement may be executed in counterparts (including by electronic or PDF signature), each of which shall be deemed an original, and all

of which together shall constitute one and the same instrument.

IN WITNESS WHEREOF, the parties have executed

this Agreement as of the Effective Date.

T3 DEFENSE INC.

By:

/s/ Reuven Yeganeh

Name:

Reuven Yeganeh

Title:

Director

HOLDER:

/s/ Menachem Shalom

Name:

Menachem Shalom

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