8-K

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): December 31, 2025

ALT5

SIGMA CORPORATION

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (702) 997-5968

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 (§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. ☐

ALT5 Sigma Corporation (the “Company”) expects that the Company’s 2025 Annual Meeting of Stockholders (the “Annual Meeting”) will be held virtually by means of remote communication on February 27, 2026. Stockholders of record of the Company’s common stock at the close of business on January 30, 2026, will be entitled to notice of, and to vote at, the Annual Meeting.

Due to the fact that the date of the Annual Meeting has been changed by more than 30 days from the anniversary date of the 2024 Annual Meeting of Stockholders, the Company is providing the due date for submission of any qualified stockholder proposal or qualified stockholder nominations. Stockholders of the Company who wish to have a proposal considered for inclusion in the Company’s proxy materials for the Annual Meeting pursuant to Rule 14a-8 under the Securities Exchange Act of 1934 (the “Exchange Act”), must ensure that such proposal is received by the Company’s Secretary at its corporate office at 8548 Rozita Lee Avenue, Suite 305, Las Vegas, NV, 89113, on or before the close of business on January 13, 2026, which the Company has determined to be a reasonable time before it expects to begin on print and send its proxy materials in accordance with Rule 14a-5(f) and Rule 14a-8(e) under the Exchange Act. Any such proposal must also meet the requirements set forth in the rules and regulations of the Securities and Exchange Commission in order to be eligible for inclusion in the proxy materials for the Annual Meeting.

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.