ClearSign Technologies Corp — Director's Dealing 2026

Mar 3, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ClearSign Technologies Corp (CLIR)
CIK: 0001434524
Period of Report: 2026-02-26

Reporting Person: Deller Colin James (Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-26	Common Stock	A	210043	—	Acquired	381896	Direct
2026-02-26	Common Stock	F	105022	$0.5616	Disposed	276874	Direct

Footnotes

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.