Director Lou Basenese receives 3,024 options at ClearSign Technologies (CLIR)

Rhea-AI Filing Summary

ClearSign Technologies director Lou Basenese received a grant of stock options as board compensation. He was awarded non-statutory options to purchase 3,024 shares of common stock at an exercise price of $4.36 per share for service as a non-employee director for the quarter ended March 31, 2026.

The options were granted under the ClearSign Technologies Corporation 2021 Equity Incentive Plan pursuant to the company’s non-employee director compensation policy. They vested and became exercisable immediately on the March 31, 2026 grant date and expire on March 31, 2036. No open-market share purchases or sales were reported.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Basenese Lou

Role Director

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

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

Footnotes (1)

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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 granted March 31, 2026

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

Underlying shares 3,024 shares Common stock underlying the non-statutory options

Expiration date March 31, 2036 Option expiration for Basenese’s grant

Total derivative holdings after grant 3,024 options Total non-statutory stock options following this transaction

Key Terms

Non-Statutory Stock Options, Equity Incentive Plan, non-employee director compensation policy

3 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.

Equity Incentive Plan financial

"under the ClearSign Technologies Corporation 2021 Equity Incentive Plan"

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

non-employee director compensation policy financial

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

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^*

Basenese Lou

(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/ Louis J. Basenese	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)

FAQ

What insider transaction did ClearSign Technologies (CLIR) report for Lou Basenese?

ClearSign Technologies reported that director Lou Basenese received non-statutory stock options to purchase 3,024 common shares. The grant was compensation for his service as a non-employee director for the quarter ended March 31, 2026, not an open-market stock purchase or sale.

How many stock options did Lou Basenese receive from ClearSign Technologies (CLIR)?

Lou Basenese received options to purchase 3,024 shares of ClearSign Technologies common stock. These non-statutory stock options were granted as part of the company’s non-employee director compensation policy for the quarter ended March 31, 2026, and were fully vested on the grant date.

What is the exercise price and term of Lou Basenese’s options at ClearSign Technologies (CLIR)?

The granted non-statutory stock options have an exercise price of $4.36 per share and expire on March 31, 2036. They were immediately vested and exercisable on the March 31, 2026 grant date, giving Basenese a long-dated incentive tied to ClearSign Technologies’ common stock performance.

Were Lou Basenese’s ClearSign Technologies (CLIR) options part of a compensation plan?

Yes. The options were granted under the ClearSign Technologies Corporation 2021 Equity Incentive Plan pursuant to the issuer’s non-employee director compensation policy. They represent routine equity compensation for board service during the quarter ended March 31, 2026, rather than discretionary market trading.

Did the Form 4 for ClearSign Technologies (CLIR) show any stock sales or purchases by Lou Basenese?

The Form 4 shows only an option grant to Lou Basenese and no open-market stock purchases or sales. He acquired 3,024 non-statutory stock options as compensation, which were immediately exercisable, but the filing does not report any exercise or sale of the underlying shares.