ClearSign (NASDAQ: CLIR) CFO Brent Hinds vests 10,127 RSUs, nets shares

Rhea-AI Filing Summary

ClearSign Technologies Corp. Chief Financial Officer Brent Hinds reported routine equity compensation activity. On February 2, 2026, 10,127 restricted stock units (RSUs) granted on February 2, 2023 vested into the same number of shares of common stock at no cost under the 2021 Equity Incentive Plan.

To cover tax obligations from this vesting, 3,711 shares of common stock were withheld at a price of $0.5991 per share, based on the Nasdaq closing price that day. After these transactions, Hinds directly owned 124,256 shares of ClearSign common stock. The original 30,380 RSUs vest in three equal annual installments that began on February 2, 2024.

Insider Trade Summary

10,127 shares exercised/converted

Mixed 3 txns

Insider Hinds Brent

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	10,127	$0.00	--
Exercise	Common Stock	10,127	$0.00	--
Tax Withholding	Common Stock	3,711	$0.5991	$2K

Holdings After Transaction: Restricted Stock Unit — 10,127 shares (Direct); Common Stock — 127,967 shares (Direct)

Footnotes (1)

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

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Hinds Brent

(Last) (First) (Middle)

8023 E. 63RD PLACE, SUITE 101

(Street)

TULSA OK 74133

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ClearSign Technologies Corp [ CLIR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/02/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/02/2026		M		10,127(1)	A	(1)	127,967	D
Common Stock	02/02/2026		F		3,711(2)	D	$0.5991	124,256	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	(3)	02/02/2026		M			10,127	(4)	(4)	Common Stock	10,127	$0	10,127	D

Explanation of Responses:

1. 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.

2. 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.

3. 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.

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

	/s/ Brent Hinds	02/04/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What insider transaction did CLIR CFO Brent Hinds report on February 2, 2026?

Brent Hinds reported the vesting of 10,127 RSUs into common shares on February 2, 2026. These RSUs were part of a 30,380-unit grant awarded on February 2, 2023 as a one-time bonus for his 2022 executive officer services.

How many ClearSign (CLIR) shares did the CFO own after the reported Form 4 transactions?

After the reported transactions, Brent Hinds directly owned 124,256 shares of ClearSign common stock. This reflects the 10,127 RSUs that vested into shares, net of 3,711 shares withheld to satisfy his tax liability associated with the vesting event.

Why were 3,711 CLIR shares withheld in Brent Hinds’ Form 4 filing?

The 3,711 ClearSign shares were withheld to pay Brent Hinds’ tax liability from the vesting of 10,127 RSUs. The withholding amount was calculated using the company’s Nasdaq closing stock price of $0.5991 on February 2, 2026, the RSU vesting date.

What are the terms of the 30,380 RSUs granted to CLIR’s CFO in 2023?

On February 2, 2023, Brent Hinds received 30,380 RSUs as a one-time bonus for 2022 services. Each RSU equals one share of common stock or cash, and the award vests in three equal installments beginning February 2, 2024 under the 2021 Equity Incentive Plan.

How were the 10,127 ClearSign RSUs treated upon vesting for the CFO?

When 10,127 RSUs vested, they converted into an equal number of ClearSign common shares without any cash payment by Brent Hinds. This conversion followed the company’s 2021 Equity Incentive Plan and reflected part of his previously granted 30,380 RSU award.

What role does Brent Hinds hold at ClearSign Technologies Corp (CLIR)?

Brent Hinds serves as Chief Financial Officer of ClearSign Technologies Corp. His Form 4 filing reflects equity compensation activity related to this executive role, including a one-time RSU bonus grant for services performed in the year ended December 31, 2022.