Anthony DiGiandomenico - 31 Mar 2026 Form 4 Insider Report for ClearSign Technologies Corp (CLIR)

Reporting relationship: Director
Issuer ticker: CLIR
Reported as of: 31 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Apr 2026, 19:00:18 UTC
Prior SEC filing: 26 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Anthony DiGiandomenico

Key filing fact

Anthony DiGiandomenico filed Form 4 for ClearSign Technologies Corp (CLIR) on 02 Apr 2026.

Key facts

This page summarizes Anthony DiGiandomenico's Form 4 filing for ClearSign Technologies Corp (CLIR).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 02 Apr 2026, 19:00.

Change

Previous filing in this sequence was filed on 26 Feb 2026.
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 disclosures.

View source filing

Reporting Owners (1)

CIK 0001083544 Primary reporting owner

DIGIANDOMENICO ANTHONY

Relationship: Director
Address: 8023 E. 63RD PLACE, SUITE 101, TULSA
Signature: /s/ Anthony DiGiandomenico
Signature date: 02 Apr 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CLIR transaction Derivative

Non-Statutory Stock Options

Award

Transaction value
Shares: +3,024
Change %
Price: $0.000000^*
Shares after: 3,024
Date: 31 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,024
Exercise price: $4.36
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

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.