ClearSign (CLIR) CFO receives stock and RSU bonus with tax share withholding

Rhea-AI Filing Summary

ClearSign Technologies Corp Chief Financial Officer Brent Hinds reported equity compensation awards and related tax withholding. On February 26, 2026, he was granted 56,645 shares of common stock as a one-time bonus for services in 2025, valued using the closing price of $0.5616 per share. He also received 47,009 restricted stock units, each representing one share of common stock or its cash equivalent. To cover tax liabilities from the stock issuance, 20,761 common shares were withheld at the same $0.5616 price, leaving him with 170,824 common shares held directly after these transactions.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Hinds Brent

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit	47,009	$0.00	--
Grant/Award	Common Stock	56,645	$0.00	--
Tax Withholding	Common Stock	20,761	$0.5616	$12K

Holdings After Transaction: Restricted Stock Unit — 47,009 shares (Direct); Common Stock — 191,585 shares (Direct)

Footnotes (1)

1. Represents a one-time bonus grant to the 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. 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. Represents a one-time bonus restricted stock units ("RSUs") grant to reporting person for services as an executive officer for the year ended December 31, 2025, and each RSU represents a right to receive one share of common stock or the cash equivalent thereof. The RSUs granted on February 26, 2026, vest in three equal installments commencing on the first anniversary of the grant date.

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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)
02/26/2026

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	02/26/2026		A		56,645(1)	A	$0	191,585	D
Common Stock	02/26/2026		F		20,761(2)	D	$0.5616	170,824	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)	02/26/2026		A		47,009		(4)	(4)	Common Stock	47,009	$0	47,009	D

Explanation of Responses:

1. Represents a one-time bonus grant to the 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.

2. 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.

3. Represents a one-time bonus restricted stock units ("RSUs") grant to reporting person for services as an executive officer for the year ended December 31, 2025, and each RSU represents a right to receive one share of common stock or the cash equivalent thereof.

4. The RSUs granted on February 26, 2026, vest in three equal installments commencing on the first anniversary of the grant date.

	/s/ Brent Hinds	03/02/2026
	** 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 transactions did CLIR CFO Brent Hinds report on February 26, 2026?

Brent Hinds reported equity awards and tax withholding. He received 56,645 bonus common shares and 47,009 restricted stock units, with 20,761 shares withheld to pay taxes, all valued at the $0.5616 closing stock price on February 26, 2026.

How many ClearSign (CLIR) shares does the CFO hold after these Form 4 transactions?

After the reported transactions, Brent Hinds directly holds 170,824 shares of ClearSign common stock. This figure reflects the stock grant he received on February 26, 2026, net of 20,761 shares withheld to satisfy his tax liability tied to that bonus award.

What type of equity awards did ClearSign (CLIR) grant its CFO for 2025 performance?

ClearSign granted its CFO a one-time bonus in common stock and restricted stock units for 2025 services. The award included 56,645 common shares and 47,009 RSUs, both approved based on performance targets set by the human capital and compensation committee.

How are the ClearSign (CLIR) restricted stock units to the CFO structured and when do they vest?

Each RSU granted to the CFO represents a right to one ClearSign common share or cash equivalent. The RSUs granted on February 26, 2026 vest in three equal installments, starting on the first anniversary of the grant date and continuing annually thereafter.

Why were 20,761 ClearSign (CLIR) shares disposed of in the CFO’s Form 4 filing?

The 20,761-share disposition reflects tax withholding, not an open-market sale. Shares were withheld to pay Brent Hinds’ tax liability arising from the February 26, 2026 stock bonus, using the $0.5616 closing price to determine the number of shares withheld.

How was the size of the ClearSign (CLIR) CFO’s stock bonus determined?

The number of bonus shares was based on ClearSign’s February 26, 2026 closing stock price of $0.5616. Performance metrics for 2025, approved by the human capital and compensation committee, drove the award size, resulting in a grant of 56,645 common shares to the CFO.