ClearSign director granted 3,024 stock options

ClearSign Technologies Corp director Anthony Digiandomenico received a grant of 3,024 non-statutory stock options as compensation for serving as a non-employee director for the quarter ended March 31, 2026.

Rhea-AI Filing Summary

ClearSign Technologies Corp director Anthony Digiandomenico received a grant of 3,024 non-statutory stock options as compensation for serving as a non-employee director for the quarter ended March 31, 2026. The options have an exercise price of $4.36 per share, are immediately vested and exercisable, and expire on March 31, 2036.

Insider Trade Summary

Grant/Award: 3,024 shares

Grant/Award 1 txn

Insider DIGIANDOMENICO ANTHONY

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Non-Statutory Stock Options	3,024	$0.00	$0.00

Holdings After Transaction: Non-Statutory Stock Options — 3,024 contracts (Direct)

Footnotes (1)

1. F1. As compensation for services as a non-employee director during the quarter ended March 31, 2026, the reporting person was granted non-statutory stock options to purchase 3,024 shares of common stock under the ClearSign Technologies Corporation 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: 3,024 options Exercise price: $4.36 per share Underlying shares: 3,024 shares +2 more

5 metrics

Options granted 3,024 options Non-statutory stock options grant for quarter ended March 31, 2026

Exercise price $4.36 per share Exercise price for the 3,024 non-statutory stock options

Underlying shares 3,024 shares Common stock underlying the granted options

Expiration date March 31, 2036 Option expiration for the grant

Post-grant derivative holdings 3,024 options Total derivative securities following this transaction

Key Terms

Non-Statutory Stock Options, 2021 Equity Incentive Plan, non-employee director compensation policy, immediately vested and exercisable

4 terms

Non-Statutory Stock Options financial

"the reporting person was granted non-statutory stock options to purchase 3,024 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.

2021 Equity Incentive Plan financial

"under the ClearSign Technologies Corporation 2021 Equity Incentive Plan"

non-employee director compensation policy financial

"pursuant to the issuer's non-employee director compensation policy"

immediately vested and exercisable financial

"These non-statutory stock options were immediately vested and exercisable on the grant date"

FAQ

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

What insider transaction did ClearSign Technologies (CLIR) report for Anthony Digiandomenico?

ClearSign reported that director Anthony Digiandomenico received 3,024 non-statutory stock options as compensation for his services as a non-employee director for the quarter ended March 31, 2026, under the company’s 2021 Equity Incentive Plan.

What are the key terms of Anthony Digiandomenico’s 3,024 ClearSign (CLIR) stock options?

The 3,024 non-statutory stock options have an exercise price of $4.36 per share and are exercisable for 3,024 shares of common stock. They were fully vested and exercisable on the grant date and expire on March 31, 2036.

Why did ClearSign (CLIR) grant 3,024 stock options to director Anthony Digiandomenico?

The options were granted as compensation for Digiandomenico’s services as a non-employee director during the quarter ended March 31, 2026. The grant follows ClearSign’s non-employee director compensation policy and was issued under the 2021 Equity Incentive Plan.

When do Anthony Digiandomenico’s ClearSign (CLIR) stock options expire?

The non-statutory stock options granted to Anthony Digiandomenico expire on March 31, 2036. Until that date, he may choose to exercise the options at the fixed exercise price of $4.36 per share for up to 3,024 shares of common stock.

Are Anthony Digiandomenico’s ClearSign (CLIR) option grants immediately exercisable?

Yes. The footnote states that these non-statutory stock options were immediately vested and exercisable on the grant date. This means Digiandomenico does not need to wait for any vesting schedule before exercising his right to buy 3,024 shares at $4.36.

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

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Accepted by SEC EDGAR 04/02/2026 - 07:00 PM EDT 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)
03/31/2026

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	$4.36	03/31/2026		A		3,024		(1)	03/31/2036	Common Stock	3,024	$0.00	3,024	D

Explanation of Responses:

1. As compensation for services as a non-employee director during the quarter ended March 31, 2026, the reporting person was granted non-statutory stock options to purchase 3,024 shares of common stock under the ClearSign Technologies Corporation 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	04/02/2026
	** 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)