Colin J. Deller - 26 Feb 2026 Form 4 Insider Report for ClearSign Technologies Corp (CLIR)

Role: Chief Executive Officer
Signature: /s/ Colin J. Deller
Issuer symbol: CLIR
Transactions as of: 26 Feb 2026
Net transactions value: -$58,980
Form type: 4
Filing time: 02 Mar 2026, 19:01:37 UTC
Previous filing: 24 Feb 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Deller Colin James	Chief Executive Officer	8023 E. 63RD PLACE, SUITE 101, TULSA	/s/ Colin J. Deller	02 Mar 2026	0001766480

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CLIR	Common Stock	Award	$0	+210,043	+122%	$0.000000	381,896	26 Feb 2026	Direct	F1
transaction	CLIR	Common Stock	Tax liability	$58,980	-105,022	-28%	$0.5616	276,874	26 Feb 2026	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents a one-time bonus grant to reporting person for services as an executive officer for the year ended December 31, 2025, upon achievement of certain performance target metrics approved by the human capital and compensation committee of the board of directors. The number of shares awarded is based on the closing price of the Company's common stock on February 26, 2026, of $0.5616.
F2	Represents the payment of the reporting person's tax liability by withholding shares incident to the receipt of the Company's common stock issued on February 26, 2026, based on the closing price of the Company's common stock on February 26, 2026, of $0.5616.