Colin J. Deller - 26 Feb 2026 Form 4/A - Amendment Insider Report for ClearSign Technologies Corp (CLIR)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: CLIR
Reported as of: 26 Feb 2026
Net transaction value: $0
SEC form: 4/A - Amendment
Accepted by SEC: 27 Apr 2026, 20:01:12 UTC
Original report date: 02 Mar 2026
Prior SEC filing: 24 Feb 2025
Source filing: View source filing
Reporting owner signature: /s/ Colin J. Deller

Key filing fact

Colin J. Deller filed Form 4/A - Amendment for ClearSign Technologies Corp (CLIR) on 27 Apr 2026.

Key facts

This page summarizes Colin J. Deller's Form 4/A - Amendment filing for ClearSign Technologies Corp (CLIR).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 27 Apr 2026, 20:01.

Change

Previous filing in this sequence was filed on 24 Feb 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0001766480 Primary reporting owner

Deller Colin James

Relationship: Chief Executive Officer, Director
Address: 8023 E. 63RD PLACE, SUITE 101, TULSA
Signature: /s/ Colin J. Deller
Signature date: 27 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CLIR transaction

Common Stock

Award

Transaction value
Shares: +7,001
Change %: +25%
Price: $5.62^*
Shares after: 34,967
Date: 26 Feb 2026
Ownership: Direct
Footnotes: F1, F2

CLIR transaction

Common Stock

Tax liability

Transaction value
Shares: -3,501
Change %: -10%
Price: $5.62^*
Shares after: 31,466
Date: 26 Feb 2026
Ownership: Direct
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote 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.

Footnote 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.