ClearSign CEO amends Form 4 bonus share report

ClearSign Technologies Corp Chief Executive Officer Colin James Deller amended a prior insider report to correct details of a stock bonus.

Rhea-AI Filing Summary

ClearSign Technologies Corp Chief Executive Officer Colin James Deller amended a prior insider report to correct details of a stock bonus. On February 26, 2026, he received 7,001 shares of common stock as a one-time bonus grant, valued at $5.616 per share after a 1-for-10 reverse split.

To cover taxes, 3,501 shares were disposed of through tax withholding, a non-market transaction, leaving Deller with 34,967 common shares held directly. The amendment updates the originally reported grant size, tax-withheld amount, and resulting beneficial ownership tied to 2025 executive services.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Deller Colin James

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	7,001	$5.616	$39K
Exercise Price or Tax Liability	Common Stock	3,501	$5.616	$20K

Holdings After Transaction: Common Stock — 31,466 shares (Direct)

Footnotes (2)

1. F1. On March 2, 2026, the reporting person filed a Form 4 reporting the receipt of 210,043 shares of the Issuer's common stock, on a pre-reverse stock split basis, as a one-time bonus grant for services as an executive officer for the year ended December 31, 2025 (the "Original Form 4"). This amendment to the Original Form 4 is being filed to correct (i) the number of shares received in connection with the reporting person's one-time bonus grant, (ii) the number of shares withheld for tax purposes, and (iii) the number of securities beneficially owned following such transactions. The number of shares withheld is based on the closing price of the Issuer's common stock on February 26, 2026, of $5.616, as adjusted for the 1-for-10 reverse stock split effected by the Issuer on March 16, 2026.
2. F2. Amounts and price per share figures have been adjusted to reflect the 1-for-10 reverse stock split effected by the Issuer on March 16, 2026.

Key Figures

Tax-withheld shares: 3,501 shares Bonus shares granted: 7,001 shares Price per share: $5.616 per share +3 more

6 metrics

Tax-withheld shares 3,501 shares Common Stock withheld for taxes at $5.616 on Feb 26, 2026

Bonus shares granted 7,001 shares Common Stock bonus grant at $5.616 on Feb 26, 2026

Price per share $5.616 per share Closing price used to calculate tax-withheld shares on Feb 26, 2026

Shares owned after transactions 34,967 shares CEO’s direct beneficial ownership following bonus and withholding

Reverse stock split ratio 1-for-10 Reverse split effected on March 16, 2026 for all figures

Original bonus shares (pre-split) 210,043 shares Pre-reverse-split bonus grant reported in original Form 4

Key Terms

Form 4, reverse stock split, tax-withholding disposition, one-time bonus grant, +1 more

5 terms

Form 4 regulatory

"the reporting person filed a Form 4 reporting the receipt of 210,043 shares"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

reverse stock split financial

"adjusted for the 1-for-10 reverse stock split effected by the Issuer on March 16, 2026"

A reverse stock split reduces a company's number of outstanding shares while raising the price per share proportionally, so the total value of each investor's holding is unchanged; a 1-for-10 split turns 100 shares worth $1 each into 10 shares worth $10 each. Companies often do this to regain compliance with an exchange's minimum price rule or to attract investors who avoid very low-priced stocks.

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition","transaction_code_description""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

one-time bonus grant financial

"as a one-time bonus grant for services as an executive officer"

beneficially owned financial

"to correct ... the number of securities beneficially owned following such transactions"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

FAQ

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

What insider transactions did ClearSign (CLIR) report for its CEO on February 26, 2026?

ClearSign CEO Colin James Deller received 7,001 common shares as a one-time bonus grant on February 26, 2026. To cover taxes, 3,501 shares were withheld, leaving him with 34,967 shares directly owned after these compensation-related transactions.

Was the ClearSign (CLIR) CEO’s Form 4/A transaction an open-market buy or sell?

The filing shows no open-market buying or selling. Instead, the CEO received 7,001 shares as a stock bonus and 3,501 shares were disposed of solely through tax withholding, a non-market mechanism to satisfy tax obligations on the equity award.

Why did ClearSign (CLIR) file an amended Form 4/A for its CEO’s bonus shares?

The amendment corrects the originally reported number of bonus shares, the shares withheld for taxes, and the CEO’s beneficial ownership after the grant. It updates a prior Form 4 that had reported a larger, pre-reverse-split bonus share figure for 2025 services.

How many ClearSign (CLIR) shares does the CEO hold after this Form 4/A amendment?

Following the corrected bonus grant and related tax withholding, CEO Colin James Deller directly owns 34,967 shares of ClearSign common stock. This figure reflects adjustments for the company’s 1-for-10 reverse stock split effective March 16, 2026.

What role did tax withholding play in the ClearSign (CLIR) CEO’s Form 4/A?

The Form 4/A shows 3,501 shares were used for tax-withholding, classified as a tax-withholding disposition at $5.616 per share. This mechanism settles tax liabilities on the stock bonus without the CEO executing an actual sale in the open market.

How did ClearSign’s 1-for-10 reverse stock split affect the CEO’s reported bonus shares?

All share and price figures in the amendment are adjusted for ClearSign’s 1-for-10 reverse stock split on March 16, 2026. A previously reported 210,043-share bonus, on a pre-split basis, is now reflected in smaller, post-split share counts and prices.

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

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Accepted by SEC EDGAR 04/27/2026 - 08:01 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^*

Deller Colin James

(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
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
02/26/2026

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)
03/02/2026

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
Common Stock	02/26/2026		A		7,001(1)(2)	A	$5.616(2)	34,967(1)(2)	D
Common Stock	02/26/2026		F		3,501(1)(2)	D	$5.616(2)	31,466(1)(2)	D

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

Explanation of Responses:

1. On March 2, 2026, the reporting person filed a Form 4 reporting the receipt of 210,043 shares of the Issuer's common stock, on a pre-reverse stock split basis, as a one-time bonus grant for services as an executive officer for the year ended December 31, 2025 (the "Original Form 4"). This amendment to the Original Form 4 is being filed to correct (i) the number of shares received in connection with the reporting person's one-time bonus grant, (ii) the number of shares withheld for tax purposes, and (iii) the number of securities beneficially owned following such transactions. The number of shares withheld is based on the closing price of the Issuer's common stock on February 26, 2026, of $5.616, as adjusted for the 1-for-10 reverse stock split effected by the Issuer on March 16, 2026.

2. Amounts and price per share figures have been adjusted to reflect the 1-for-10 reverse stock split effected by the Issuer on March 16, 2026.

	/s/ Colin J. Deller	04/27/2026
	** 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)