ClearSign director receives 3,766 stock options

The options were immediately vested and exercisable, with a $3.55 exercise price and a September 29, 2036 expiration date.

Rhea-AI Filing Summary

ClearSign Technologies Corp director Anthony Digiandomenico received 3,766 non-statutory stock options on September 30, 2026, as compensation for director services during the quarter ended September 30, 2026. The options were immediately vested and exercisable on the grant date, have a $3.55 exercise price per common share, and expire September 29, 2036.

Insider Trade Summary

Grant/Award: 3,766 shares

Grant/Award 1 txn

Insider DIGIANDOMENICO ANTHONY

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Non-Statutory Stock Options F1	3,766	$0.00	$0.00

Holdings After Transaction: Non-Statutory Stock Options — 3,766 contracts (Direct)

Footnotes (1)

1. F1. As compensation for services as a non-employee director during the quarter ended September 30, 2026, the reporting person was granted non-statutory stock options to purchase 3,766 shares of common stock under the ClearSign Technologies Corporation Amended and Restated 2021 Equity Incentive Plan pursuant to the issuer's non-employee director compensation policy. These non-statutory stock options were immediately vested and exercisable on the grant date.

Key Figures

Options granted: 3,766 options Exercise price: $3.55 per common share Expiration date: September 29, 2036

3 metrics

Options granted 3,766 options Granted September 30, 2026

Exercise price $3.55 per common share Non-statutory stock options

Expiration date September 29, 2036 Non-statutory stock options

Key Terms

Non-Statutory Stock Options, Amended and Restated 2021 Equity Incentive Plan, immediately vested and exercisable

3 terms

Non-Statutory Stock Options financial

"granted non-statutory stock options to purchase 3,766 shares"

Non-statutory stock options are a type of reward that companies give to employees, allowing them to buy company shares at a set price within a certain period. Unlike formal or government-approved plans, these options are more flexible but may have different tax implications. For investors, they can influence a company's stock price and financial health, making them an important factor to consider.

Amended and Restated 2021 Equity Incentive Plan financial

"under the ClearSign Technologies Corporation Amended and Restated 2021 Equity Incentive Plan"

immediately vested and exercisable financial

"immediately vested and exercisable on the grant date"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many options did CLIR director Anthony Digiandomenico receive?

Anthony Digiandomenico received 3,766 non-statutory stock options on September 30, 2026, as compensation for services as a non-employee director during the quarter ended September 30, 2026.

When can Anthony Digiandomenico exercise the CLIR options, and when do they expire?

The options were immediately vested and exercisable on the grant date, September 30, 2026, and expire September 29, 2036. They have a $3.55 exercise price per common share.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/02/2026 - 07:00 PM Accepted by SEC EDGAR 10/02/2026 - 07:00 PM Learn about SEC filing dates

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^*

DIGIANDOMENICO ANTHONY

(Last) (First) (Middle)

8023 E. 63RD PLACE, SUITE 101

(Street)

TULSA OKLAHOMA 74133

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2026

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

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

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

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
Non-Statutory Stock Options	$3.55	09/30/2026		A		3,766		(1)	09/29/2036	Common Stock	3,766	$0.00	3,766	D

Explanation of Responses:

1. As compensation for services as a non-employee director during the quarter ended September 30, 2026, the reporting person was granted non-statutory stock options to purchase 3,766 shares of common stock under the ClearSign Technologies Corporation Amended and Restated 2021 Equity Incentive Plan pursuant to the issuer's non-employee director compensation policy. These non-statutory stock options were immediately vested and exercisable on the grant date.

	/s/ Anthony DiGiandomenico	10/02/2026
	** 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.
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.
* Form 4: SEC 1474 (03-26)