BIOLARGO INC

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM8-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): January 2, 2024

BioLargo, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (888)400-2863

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 (see General Instruction A.2. below):

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. ☐

(a) On January 2, 2024, the Audit Committee (the “Committee”) of the Board of Directors of BioLargo, Inc. (the “Company”) approved the engagement of Hacker Johnson & Smith PA (“Hacker Johnson”) as the Company’s independent registered public accounting firm for the Company’s fiscal year ended December 31, 2023, effective immediately, and dismissed Haskell & White LLP (“Haskell & White”), as the Company's independent registered public accounting firm.

During the fiscal years ended December 31, 2022, and 2021, and the subsequent interim periods through January 2, 2024, there were (i) no disagreements (as described in Item 304(a)(1)(iv) of Regulation S-K and the related instructions) between the Company and Haskell & White on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which, if not resolved to Haskell & White’s satisfaction, would have caused Haskell & White to make reference thereto in their reports on the financial statements for such years, and (ii) no “reportable events” within the meaning of Item 304(a)(1)(v) of Regulation S-K.

The Company has provided a copy of the foregoing disclosures to Haskell & White and requested that Haskell & White furnish it with a letter addressed to the Securities and Exchange Commission stating whether Haskell & White agrees with the above statements. A copy of Haskell & White’s letter, dated January 3, 2024, is filed as Exhibit 16.1 to this Form 8-K.

(b) During the two most recent fiscal years and in the subsequent interim period through January 2, 2024, neither the Company nor anyone acting on its behalf has consulted with Hacker Johnson with respect to the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that would have been rendered on the Company’s consolidated financial statements, or any other matters set forth in Item 304(a)(2)(i) or (ii) of Regulation S-K.

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.