8-K/A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K/A

(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported):June 24, 2024

CLEARSIGN TECHNOLOGIES CORPORATION

(Exact name of registrant as specified in charter)

8023 E. 63rd Place, Suite 101

Tulsa**,Oklahoma 74133**

(Address of Principal Executive Offices) (Zip Code)

(918) 236-6461

(Registrant’s telephone number, includingarea code)

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).

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. ¨

Explanatory Note

This Amendment No. 1 on Form 8-K/A (“Amendment No. 1”) amends the Current Report on Form 8-K of ClearSign Technologies Corporation (the “Company”) filed with the Securities and Exchange Commission on June 26, 2024 (the “Original Filing”) reporting the results of stockholders voting at the Company’s annual meeting held on June 25, 2024. This amendment is solely for the purpose of correcting a typographical error of the votes “For” and “Withheld” for director nominees David M. Maley and Judith S. Schrecker, as described in Item 5.07. Except as expressly stated herein and below, this Amendment No. 1 does not amend or update any other information contained in the Original Filing, which remains unchanged. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Filing.

Item 5.07 Submission of Matters to a Vote of Security Holders.

The voting results by the Company’s stockholders under Proposal 1 for Mr. Maley and Ms. Schrecker were reported incorrectly on the Original Filing as the result of a typographical error. The correct voting results for such proposal, as reported by the Company’s independent inspector of election, were as follows, and the Original Filing is amended accordingly:

Proposal

1. Election of Directors.

Each of the four nominees standing for re-election as a director was elected to serve on the Company’s board of directors until the election and qualification of his or her successor or until his or her earlier death, resignation, or removal.

The amended numbers have no impact on the outcome of the matter voted upon.

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 Current Report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: June 28, 2024