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): February 18, 2026

M3-Brigade Acquisition V Corp.

(Exact name of registrant as specified in its charter)

Cayman Islands

(State or other jurisdiction of incorporation)

1700 Broadway, 19th Floor, New York, New York 10019

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (212) 202-2200

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:

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

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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.

On February 18, 2026, M3-Brigade Acquisition V Corp. (the “Company”) issued a promissory note (the “Note”) to MI7 Sponsor, LLC (the “Sponsor”), the Company’s sponsor, pursuant to which the Company can borrow up to an aggregate principal amount of $2,000,000 from the Sponsor. On February 18, 2026, the Company borrowed $600,000 under the Note. The proceeds of the Note will be used to provide the Company with general working capital.

The Note bears no interest and is payable in full upon the consummation of the Company’s initial business combination (the “Maturity Date”). A failure to pay the principal on the Maturity Date shall be deemed an event of default, in which case the Note may be accelerated. If the Company does not consummate an initial business combination, the Note will be repaid solely to the extent the Company has funds available outside its trust account established in connection with the Company’s initial public offering.

The description of the Note does not purport to be complete and is subject to, and qualified in its entirety by reference to, the Note, a copy of which is attached hereto as Exhibit 10.1 and is incorporated herein by reference.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information set forth in Item 1.01 of this Current Report on Form 8-K is incorporated by reference into this Item 2.03.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits:

SIGNATURE

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.