ClearSign Technologies Corp reports

Company Names, identifiers, and filing context for this profile. 1 identity field
Company location
Tulsa, OK
SEC filing record 1 source field available
Fiscal year end
31 December
ClearSign Technologies Corp has filed 775 SEC EDGAR filings since 05 May 2008

SEC filing history

Showing 1-25 of 774 matching filings.

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25
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1
424B5 File 333-288736

424B5

Filing date
01 Jun 2026
Reporting date
Not listed
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424B5 File 333-288736

424B5

Filing date
28 May 2026
Reporting date
Not listed
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ARS File 001-35521

ARS

Filing date
28 Apr 2026
Reporting date
31 Dec 2025
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DEFA14A File 001-35521

DEFA14A

Filing date
28 Apr 2026
Reporting date
Not listed
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DEF 14A File 001-35521

DEF 14A

Filing date
28 Apr 2026
Reporting date
08 Jun 2026
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4/A

OWNERSHIP DOCUMENT

Filing date
27 Apr 2026
Reporting date
26 Feb 2026
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4

OWNERSHIP DOCUMENT

Filing date
27 Apr 2026
Reporting date
23 Apr 2026
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4

OWNERSHIP DOCUMENT

Filing date
02 Apr 2026
Reporting date
31 Mar 2026
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4

OWNERSHIP DOCUMENT

Filing date
02 Apr 2026
Reporting date
31 Mar 2026
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4

OWNERSHIP DOCUMENT

Filing date
02 Apr 2026
Reporting date
31 Mar 2026
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4

OWNERSHIP DOCUMENT

Filing date
19 Mar 2026
Reporting date
16 Mar 2026
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4

OWNERSHIP DOCUMENT

Filing date
02 Mar 2026
Reporting date
26 Feb 2026
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4

OWNERSHIP DOCUMENT

Filing date
02 Mar 2026
Reporting date
26 Feb 2026
SEC evidence
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