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 26-50 of 774 matching filings.

Per page
25
Current page
2
4

OWNERSHIP DOCUMENT

Filing date
24 Feb 2026
Reporting date
20 Feb 2026
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4

OWNERSHIP DOCUMENT

Filing date
04 Feb 2026
Reporting date
02 Feb 2026
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DEF 14A File 001-35521

DEF 14A

Filing date
02 Feb 2026
Reporting date
26 Feb 2026
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PRE 14A File 001-35521

PRE 14A

Filing date
23 Jan 2026
Reporting date
26 Feb 2026
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4

OWNERSHIP DOCUMENT

Filing date
03 Oct 2025
Reporting date
01 Oct 2025
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4

OWNERSHIP DOCUMENT

Filing date
03 Oct 2025
Reporting date
01 Oct 2025
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424B4 File 333-289549

424B4

Filing date
22 Aug 2025
Reporting date
Not listed
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EFFECT File 333-289549

EFFECT filing

Filing date
21 Aug 2025
Reporting date
Not listed
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CORRESP

CORRESP filing

Filing date
20 Aug 2025
Reporting date
Not listed
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S-1/A File 333-289549

FORM S-1/A

Filing date
20 Aug 2025
Reporting date
Not listed
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UPLOAD File 333-289549

UPLOAD filing

Filing date
14 Aug 2025
Reporting date
Not listed
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EFFECT File 333-288736

EFFECT filing

Filing date
28 Jul 2025
Reporting date
Not listed
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CORRESP

CORRESP filing

Filing date
24 Jul 2025
Reporting date
Not listed
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