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 794 SEC EDGAR filings since 05 May 2008

SEC filing history

Showing 1-25 of 793 matching filings.

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25
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1
4

OWNERSHIP DOCUMENT

Filing date
02 Oct 2026
Reporting date
30 Sep 2026
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Oct 2026
Reporting date
30 Sep 2026
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Oct 2026
Reporting date
30 Sep 2026
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Oct 2026
Reporting date
30 Sep 2026
SEC evidence
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3

OWNERSHIP DOCUMENT

Filing date
11 Aug 2026
Reporting date
06 Aug 2026
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D File 021-592864

D filing

Filing date
31 Jul 2026
Reporting date
Not listed
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SCHEDULE 13G/A File 005-86820

SCHEDULE 13G/A filing

Filing date
24 Jul 2026
Reporting date
Not listed
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4

PRIMARY DOCUMENT

Filing date
24 Jul 2026
Reporting date
22 Jul 2026
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424B5 File 333-288736

424B5

Filing date
06 Jul 2026
Reporting date
Not listed
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4

OWNERSHIP DOCUMENT

Filing date
02 Jul 2026
Reporting date
30 Jun 2026
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Jul 2026
Reporting date
30 Jun 2026
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Jul 2026
Reporting date
30 Jun 2026
SEC evidence
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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
SEC evidence
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