ClearSign director receives RSU and option grants

ClearSign Technologies Corp director Silva Gil Todd received new equity compensation awards for board service.

Rhea-AI Filing Summary

ClearSign Technologies Corp director Silva Gil Todd received new equity compensation awards for board service. For the quarter ended March 31, 2026, the director was granted 3,440 restricted stock units and non‑statutory stock options for 3,024 shares of common stock.

The RSUs each represent one share of common stock or its cash equivalent and vest upon the earliest of a change in control, disability, death, or separation from service. The stock options were immediately vested and exercisable on the grant date, have a $4.36 exercise price, and expire on March 31, 2036. Following these awards, the director directly owns 123,909 shares of common stock.

Insider Trade Summary

Grant/Award: 6,464 shares

Grant/Award 2 txns

Insider Silva Gil Todd

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	3,440	$0.00	$0.00
Grant/Award	Non-Statutory Stock Options	3,024	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 123,909 contracts (Direct); Non-Statutory Stock Options — 3,024 contracts (Direct)

Footnotes (3)

1. F1. As compensation for services as a non-employee director during the quarter ended March 31, 2026, the reporting person was granted restricted stock units ("RSUs") under the ClearSign Technologies Corporation 2021 Equity Incentive Plan (the "Plan") pursuant to the issuer's non-employee director compensation policy, and each RSU represents a right to receive one share of common stock or the cash equivalent thereof.
2. F2. 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.
3. F3. 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 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

RSU grant: 3,440 RSUs Stock option grant: 3,024 options Option exercise price: $4.36 per share +3 more

6 metrics

RSU grant 3,440 RSUs Non-employee director compensation for quarter ended March 31, 2026

Stock option grant 3,024 options Non-statutory stock options granted to purchase common stock

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

Option expiration March 31, 2036 Expiration date of non-statutory stock options if unexercised

Shares held after grant 123,909 shares Director’s direct common stock holdings following reported transactions

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

Key Terms

Restricted Stock Units, Non-Statutory Stock Options, 2021 Equity Incentive Plan, Change in Control, +1 more

5 terms

Restricted Stock Units financial

"the reporting person was granted restricted stock units ("RSUs") under the ClearSign Technologies Corporation 2021 Equity Incentive Plan"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Non-Statutory Stock Options financial

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

2021 Equity Incentive Plan financial

"under the ClearSign Technologies Corporation 2021 Equity Incentive Plan (the "Plan")"

Change in Control financial

"The RSUs will vest upon the first to occur of: (1) a Change in Control"

A "change in control" occurs when the ownership or management of a company shifts significantly, such as through a merger, acquisition, or sale of a large part of its assets. This change can impact how the company is run and may influence its future direction. For investors, it matters because it can affect the company's stability, strategy, and value, often signaling potential changes in investment risk or opportunity.

separation from service financial

"or (4) the reporting person's separation from service."

FAQ

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

What equity awards did ClearSign (CLIR) director Silva Gil Todd receive?

Silva Gil Todd received 3,440 restricted stock units and 3,024 non-statutory stock options as compensation for serving as a non-employee director for the quarter ended March 31, 2026. Each RSU represents one share of common stock or its cash equivalent under ClearSign’s 2021 Equity Incentive Plan.

How do the new RSUs granted to ClearSign (CLIR) director vest?

The 3,440 RSUs vest upon the first of four events: a change in control, the director’s disability, the director’s death, or the director’s separation from service. Until one of these triggers occurs, the RSUs remain unvested but represent a right to future common stock or cash.

What are the terms of the ClearSign (CLIR) stock options granted to the director?

The director received non-statutory stock options for 3,024 shares of common stock at a $4.36 exercise price. These options were fully vested and exercisable on the grant date and will expire on March 31, 2036, if not exercised earlier under the plan’s terms.

Was the ClearSign (CLIR) director’s Form 4 transaction a market purchase or sale?

The Form 4 reports compensation-related grants, not market trades. The director acquired RSUs and stock options as a grant under the non-employee director compensation policy, with no open-market buying or selling of common shares reported in this filing.

How many ClearSign (CLIR) shares does the director hold after these awards?

After receiving the new equity awards, the director directly holds 123,909 shares of ClearSign common stock. This figure reflects direct ownership as of the transaction date reported, separate from the additional rights represented by the unvested RSUs and outstanding stock options.

Under what plan were the ClearSign (CLIR) director’s RSUs and options granted?

Both the RSUs and non-statutory stock options were granted under the ClearSign Technologies Corporation 2021 Equity Incentive Plan. The grants were made pursuant to the company’s non-employee director compensation policy for services during the quarter ended March 31, 2026.

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

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Accepted by SEC EDGAR 04/02/2026 - 07:01 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^*

Silva Gil Todd

(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
Restricted Stock Units	(1)	03/31/2026		A		3,440		(2)	(2)	Common Stock	3,440	$0.00	123,909	D
Non-Statutory Stock Options	$4.36	03/31/2026		A		3,024		(3)	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 restricted stock units ("RSUs") under the ClearSign Technologies Corporation 2021 Equity Incentive Plan (the "Plan") pursuant to the issuer's non-employee director compensation policy, 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.

3. 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 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/ Gil Todd Silva	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)