ClearSign Technologies Corp reports

Company location: Tulsa, OK
Fiscal year end: 31 December

ClearSign Technologies Corp has filed 789 SEC EDGAR filings since 05 May 2008

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SEC filing history

Showing 26-50 of 788 matching filings.

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2

4/A

OWNERSHIP DOCUMENT

Filing date: 27 Apr 2026
Reporting date: 26 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 27 Apr 2026
Reporting date: 23 Apr 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

8-K File 001-35521

FORM 8-K

Filing date: 10 Apr 2026
Reporting date: 09 Apr 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 02 Apr 2026
Reporting date: 31 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 02 Apr 2026
Reporting date: 31 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 02 Apr 2026
Reporting date: 31 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

10-K File 001-35521

10-K

Filing date: 31 Mar 2026
Reporting date: 31 Dec 2025
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

8-K File 001-35521

FORM 8-K

Filing date: 30 Mar 2026
Reporting date: 30 Mar 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 19 Mar 2026
Reporting date: 16 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

8-K File 001-35521

FORM 8-K

Filing date: 10 Mar 2026
Reporting date: 06 Mar 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

8-K File 001-35521

FORM 8-K

Filing date: 04 Mar 2026
Reporting date: 26 Feb 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 02 Mar 2026
Reporting date: 26 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 02 Mar 2026
Reporting date: 26 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

8-K File 001-35521

FORM 8-K

Filing date: 25 Feb 2026
Reporting date: 24 Feb 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 24 Feb 2026
Reporting date: 20 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 04 Feb 2026
Reporting date: 02 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

DEF 14A File 001-35521

DEF 14A

Filing date: 02 Feb 2026
Reporting date: 26 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

PRE 14A File 001-35521

PRE 14A

Filing date: 23 Jan 2026
Reporting date: 26 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

8-K File 001-35521

FORM 8-K

Filing date: 07 Jan 2026
Reporting date: 07 Jan 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

8-K File 001-35521

FORM 8-K

Filing date: 08 Dec 2025
Reporting date: 08 Dec 2025
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

8-K File 001-35521

FORM 8-K

Filing date: 21 Nov 2025
Reporting date: 19 Nov 2025
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

8-K File 001-35521

FORM 8-K

Filing date: 17 Nov 2025
Reporting date: 11 Nov 2025
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

10-Q File 001-35521

10-Q

Filing date: 14 Nov 2025
Reporting date: 30 Sep 2025
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 03 Oct 2025
Reporting date: 01 Oct 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

4

OWNERSHIP DOCUMENT

Filing date: 03 Oct 2025
Reporting date: 01 Oct 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

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