[Form 4] ClearSign Technologies Corp Insider Trading Activity

Rhea-AI Filing Summary

ClearSign Technologies (CLIR) reported a director equity transaction. On 10/01/2025, a non‑executive director acquired 24,621 restricted stock units (RSUs) at $0.00 under the company’s 2021 Equity Incentive Plan as compensation for the quarter ending December 31, 2025.

The RSUs vest upon the first to occur of a change in control, disability, death, or separation from service. After this grant, the reporting person directly beneficially owned 70,266 derivative securities.

Insights

Equity compensation analyst

Routine director RSU grant; neutral impact.

ClearSign Technologies reported a director equity award of 24,621 RSUs on 10/01/2025 at $0.00 (standard for RSUs). This aligns with customary board compensation and does not itself change cash balances.

Vesting is contingent on specified events: Change in Control, Disability, death, or separation from service, as described. Post-transaction holdings show 70,266 derivative securities beneficially owned directly.

This filing records equity compensation and ownership. Actual impact depends on vesting events and future share delivery mechanics disclosed in subsequent company materials.

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^*

Basenese Lou

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

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

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 Units	(1)	10/01/2025		A		24,621		(2)	(2)	Common Stock	24,621	$0.00	70,266	D

Explanation of Responses:

1. As compensation for services as a non-executive director during the quarter ending December 31, 2025, the reporting person was granted restricted stock units ("RSUs") under the ClearSign Technologies Corporation 2021 Equity Incentive Plan and each RSU represents a right to receive one share of common stock or the cash equivalent thereof.

2. The RSUs will vest upon the first to occur of: (1) a Change in Control (as defined in the applicable RSU award agreement), (2) the reporting person's Disability (as defined in the applicable RSU award agreement); (3) the reporting person's death; or (4) the reporting person's separation from service.

	/s/ Louis J. Basenese	10/03/2025
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did CLIR disclose in this Form 4?

A director acquired 24,621 RSUs on 10/01/2025 at $0.00 as part of quarterly director compensation under the 2021 Equity Incentive Plan.

How many RSUs were granted to the CLIR director and at what price?

The grant was for 24,621 RSUs at an RSU price of $0.00.

What are the vesting conditions for the RSUs reported by CLIR?

They vest upon the first to occur of change in control, disability, death, or separation from service.

What is the director’s derivative holdings after the transaction?

Following the transaction, the director directly beneficially owned 70,266 derivative securities.

What plan governs the RSU grant reported by CLIR?

The grant was made under the ClearSign Technologies Corporation 2021 Equity Incentive Plan.

What is the relationship of the reporting person to CLIR?

The reporting person is a Director of ClearSign Technologies.