ClearSign Technologies Corp — Director's Dealing 2026

Feb 4, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

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

Reporting Person: Hinds Brent (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-02	Common Stock	M	10127	—	Acquired	127967	Direct
2026-02-02	Common Stock	F	3711	$0.5991	Disposed	124256	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-02	Restricted Stock Unit	$	M	10127	Disposed		Common Stock (10127)	Direct

Footnotes

F1: Reflects the vesting of 10,127 restricted stock units ("RSUs") out of the 30,380 RSUs granted to the reporting person on February 2, 2023, into an equal number of shares of the Company's common stock, without the payment of any consideration, pursuant to the Company's 2021 Equity Incentive Plan.

F2: Represents the payment of the reporting person's tax liability by withholding shares in connection with the vesting of 10,127 RSUs on February 2, 2026, and calculated based on the closing price of the Company's common stock, as reported on the Nasdaq Stock Market, on February 2, 2026, of $0.5991.

F3: On February 2, 2023, the reporting person was granted 30,380 RSUs as a one-time bonus for services as an executive officer for the year ended December 31, 2022, and each RSU represents a right to receive one share of common stock or the cash equivalent thereof.

F4: The RSUs granted on February 2, 2023, vest in three equal installments that commenced on February 2, 2024.