ClearSign director Silva receives 4,225 stock units

A director's RSUs vest on the first of four specified events, while the options were immediately exercisable and expire September 29, 2036.

Rhea-AI Filing Summary

ClearSign Technologies Corp director Gil Todd Silva acquired 4,225 restricted stock units and 3,766 non-statutory stock options on September 30, 2026, as compensation for services as a non-employee director.

Each RSU represents a right to receive one share of common stock or its cash equivalent and vests upon the first of a Change in Control, disability, death, or separation from service. The options were immediately vested and exercisable at $3.55 per share and expire September 29, 2036. The reported post-transaction amounts were 23,801 RSUs and 3,766 options.

Insider Trade Summary

Grant/Award: 7,991 shares

Grant/Award 2 txns

Insider Silva Gil Todd

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units F1, F2	4,225	$0.00	$0.00
Grant/Award	Non-Statutory Stock Options F3	3,766	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 23,801 contracts (Direct); Non-Statutory Stock Options — 3,766 contracts (Direct)

Footnotes (3)

1. F1. As compensation for services as a non-employee director during the quarter ended September 30, 2026, the reporting person was granted restricted stock units ("RSUs") under the ClearSign Technologies Corporation Amended and Restated 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 September 30, 2026, the reporting person was granted non-statutory stock options to purchase 3,766 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

Restricted stock units granted: 4,225 RSUs RSUs following transaction: 23,801 RSUs Non-statutory stock options granted: 3,766 options +2 more

5 metrics

Restricted stock units granted 4,225 RSUs Granted September 30, 2026

RSUs following transaction 23,801 RSUs Reported after the September 30, 2026 transaction

Non-statutory stock options granted 3,766 options Granted September 30, 2026

Exercise price $3.55 per share Non-statutory stock options

Option expiration date September 29, 2036 Non-statutory stock options

Key Terms

restricted stock units, non-statutory stock options, Change in Control

3 terms

restricted stock units financial

"granted restricted stock units ("RSUs") under the 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

"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.

Change in Control technical

"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.

FAQ

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

How many awards did the CLIR director receive?

Gil Todd Silva received awards of 4,225 restricted stock units and 3,766 non-statutory stock options on September 30, 2026. The awards were compensation for services as a non-employee director during the quarter ended September 30, 2026.

When do the CLIR director's restricted stock units vest?

The 4,225 restricted stock units vest upon the first to occur of a Change in Control, disability, death, or Gil Todd Silva's separation from service. Each RSU represents a right to receive one share of common stock or the cash equivalent.

What are the terms of the CLIR director's stock options?

The 3,766 non-statutory stock options were immediately vested and exercisable on the grant date, September 30, 2026, at an exercise price of $3.55 per share. They expire September 29, 2036.

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

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Available on EDGAR 10/02/2026 - 07:01 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^*

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)
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
Restricted Stock Units	(1)	09/30/2026		A		4,225		(2)	(2)	Common Stock	4,225	$0.00	23,801	D
Non-Statutory Stock Options	$3.55	09/30/2026		A		3,766		(3)	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 restricted stock units ("RSUs") under the ClearSign Technologies Corporation Amended and Restated 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 September 30, 2026, the reporting person was granted non-statutory stock options to purchase 3,766 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/ Gill Todd Silva	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)