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): August 1426, 2025

CLEARSIGN TECHNOLOGIES CORPORATION

(Exact name of registrant as specified in charter)

Delaware		001-35521		26-2056298
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

8023 E. 63rd Place, Suite 101

Tulsa, Oklahoma 74133

(Address of Principal Executive Offices) (Zip Code)

(918) 236-6461

(Registrant's telephone number, including area 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).

¨	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 CFR240.14a-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 240.13(e)-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		CLIR		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 (§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. ¨

Item 28.0201 ~~Results~~Other ~~of Operations and Financial Condition~~Events.

ToAs ~~the~~previously ~~extent~~disclosed, ~~required~~on August 8, 2025, ClearSign Technologies Corporation (the ~~information~~“Company”) received a notice from the Listing Qualifications Department of the Nasdaq Stock Market LLC (“Nasdaq”) stating that the Company is not in compliance with the board of directors independence requirement set forth ~~below~~in Nasdaq Listing Rule 5605(b)(1) and the audit committee composition requirement set forth in ~~Item~~Nasdaq ~~7.01~~Listing Rule 5605(c)(2)(A) (collectively, the “Nasdaq Composition Requirements”) due to the resignations of ~~this~~Catharine ~~Current~~M. ~~Report~~de onLacy ~~Form 8-K~~and isJudith ~~incorporated~~S. ~~herein~~Schrecker byfrom ~~reference~~the Company’s board of directors (the “Board”), effective as of inAugust ~~its~~4, ~~entirety~~2025.

~~Item~~ On 7August 26, 2025, the Board held a meeting and, in light of updated materials reviewed by the Board pertinent to the independence determination of Anthony DiGiandomenico, a member of the Board, it determined that Mr.01 DiGiandomenico is an “independent director” under Nasdaq Listing Rule 5605(a)(2) and Rule 10A-3 under the Securities Exchange Act of 1934, as amended. As a result of such determinations, the Board appointed Mr. DiGiandomenico to the Audit and Risk Committee of the Board (the “Audit Committee”), effective immediately. In the same meeting, the Board also appointed G. Todd Silva, an “independent director” and member of the Audit Committee, as the Audit Committee’s chairperson and designated him as the committee’s “audit committee financial expert,” as such term is defined in Item 407(d)(5) of Regulation FDS-K, ~~Disclosure~~effective immediately.

OnSubsequently, on August 1428, 2025, ~~ClearSign~~the ~~Technologies~~Company ~~Corporation~~notified (Nasdaq of the ~~“Company”)~~actions ~~issued~~described aabove, ~~press~~and, ~~release~~as ~~announcing~~a result, on the ~~results~~same ofdate, ~~operations~~Nasdaq issued a letter ~~for~~to the ~~quarter~~Company ~~ended~~stating ~~June 30~~that, ~~2025~~based (on the ~~“Financial~~Company’s ~~Results”).~~notification, ~~The~~it ~~press~~had ~~release~~regained iscompliance ~~furnished~~with the Nasdaq Composition Requirements as ~~Exhibit 99~~of such date.1 Notwithstanding the foregoing, the Board still intends to ~~this Current~~fill ~~Report~~the one vacancy on ~~Form 8-K~~the Board resulting from the resignations of Mss. de Lacy and isSchrecker ~~incorporated~~after bytaking ~~reference~~into account the reduction in ~~its~~size ~~entirety~~of ~~into~~the ~~this~~Board ~~Item~~from 7six to five directors effective as of August 6, 2025.~~01.~~

Also on August 14, 2025, the Company held a conference call discussing the Financial Results and other business related information. A transcript of this conference call is furnished as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated by reference in its entirety into this Item 7.01.

The information furnished with this Item 7.01, including Exhibits 99.1 and 99.2, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any other filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Item 9.01

Financial Statements and Exhibits.

(d) Exhibits.

(d) Exhibits.

Exhibit No.		Description
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

Exhibit No.		Description
99.1**		Press Release, dated August 14, 2025.
99.2**		Transcript of Conference Call held on August 14, 2025.
104*		Cover Page Interactive Data File (embedded within the Inline XBRL document).

* Filed herewith.

** Furnished herewith.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: August 1529, 2025

	CLEARSIGN TECHNOLOGIES CORPORATION

	By:	/s/ Colin James Deller
	Name:	Colin James Deller
	Title:	Chief Executive Officer

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