ClearSign director granted 4,595 stock options

ClearSign Technologies director Anthony Digiandomenico received a grant of stock options as compensation.

Rhea-AI Filing Summary

ClearSign Technologies director Anthony Digiandomenico received a grant of stock options as compensation. On the grant date, he was awarded non-statutory stock options covering 4,595 shares of ClearSign common stock under the Amended and Restated 2021 Equity Incentive Plan.

The options have an exercise price of $3.67 per share, expire on June 29, 2036, and were fully vested and exercisable immediately. Following this grant, his directly held derivative position reported in this filing consists of 4,595 non-statutory stock options linked to ClearSign common stock.

Insider Trade Summary

Grant/Award: 4,595 shares

Grant/Award 1 txn

Insider DIGIANDOMENICO ANTHONY

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Non-Statutory Stock Options	4,595	$0.00	$0.00

Holdings After Transaction: Non-Statutory Stock Options — 4,595 contracts (Direct)

Footnotes (1)

1. F1. As compensation for services as a non-employee director during the quarter ended June 30, 2026, the reporting person was granted non-statutory stock options to purchase 4,595 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: 4,595 options Underlying shares: 4,595 shares Exercise price: $3.67 per share +2 more

5 metrics

Options granted 4,595 options Non-statutory stock options granted for quarter ended June 30, 2026

Underlying shares 4,595 shares Common stock underlying the non-statutory stock options

Exercise price $3.67 per share Exercise price of granted non-statutory stock options

Expiration date June 29, 2036 Expiration of the granted non-statutory stock options

Derivative holdings after grant 4,595 options Total non-statutory stock options held directly after this transaction

Key Terms

Non-Statutory Stock Options, Amended and Restated 2021 Equity Incentive Plan, non-employee director compensation policy, exercise price

4 terms

Non-Statutory Stock Options financial

"the reporting person was granted non-statutory stock options to purchase 4,595 shares of common stock"

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"

non-employee director compensation policy financial

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

exercise price financial

"conversion or exercise price of 3.6700"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

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 Technologies reported that director Anthony Digiandomenico received a grant of non-statutory stock options for 4,595 shares of common stock. The grant was issued as compensation for serving as a non-employee director during the quarter ended June 30, 2026, under the company’s equity incentive plan.

How many ClearSign (CLIR) shares are covered by the new stock options grant?

The new stock option grant covers 4,595 shares of ClearSign common stock. These options were granted as part of the non-employee director compensation for the quarter ended June 30, 2026, and represent the total derivative position reported for this grant in the Form 4 filing.

What is the exercise price and expiration date of the ClearSign (CLIR) stock options granted?

The non-statutory stock options granted to director Anthony Digiandomenico have an exercise price of $3.67 per share and expire on June 29, 2036. They were immediately vested and exercisable on the grant date, providing a long-dated incentive tied to ClearSign’s common stock performance.

Were the ClearSign (CLIR) stock options granted to the director immediately vested?

Yes, the non-statutory stock options granted to director Anthony Digiandomenico were fully vested and exercisable on the grant date. The grant was made under ClearSign Technologies Corporation’s Amended and Restated 2021 Equity Incentive Plan pursuant to its non-employee director compensation policy for the June 30, 2026 quarter.

Is the ClearSign (CLIR) Form 4 transaction a market purchase or a compensation grant?

The Form 4 transaction is a compensation grant, not a market purchase. Director Anthony Digiandomenico received non-statutory stock options for 4,595 shares at a $3.67 exercise price as compensation for his non-employee director service during the quarter ended June 30, 2026, under the company’s equity plan.

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

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Accepted by SEC EDGAR 07/02/2026 - 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)
06/30/2026

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	$3.67	06/30/2026		A		4,595		(1)	06/29/2036	Common Stock	4,595	$0.00	4,595	D

Explanation of Responses:

1. As compensation for services as a non-employee director during the quarter ended June 30, 2026, the reporting person was granted non-statutory stock options to purchase 4,595 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	07/02/2026
	** 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)