ClearSign Technologies Corp

Symbol: CLIR on Nasdaq
Entity: Company
Industry: Industrial Instruments For Measurement, Display, And Control (Industrial Applications And Services)
Business address: 8023 E. 63 Rd Place, Suite 101, 74133 Tulsa, OK
Phone: (918) 236-6461
State of incorporation: DE
Fiscal year end: December 31
Category: Non-accelerated filer
Smaller reporting company
Former names: CLEARSIGN COMBUSTION CORP (to 10/31/2019)
All SEC filings: View on sec.gov

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ClearSign Technologies Corp has filed 712 SEC EDGAR filings since 5/5/2008

Latest Filings

Form type	Document	Filing	Description	Filing date	Reporting date	File number(s)
PREC14A	Open Document \| Data	Open Filing	PREC14A	May 29, 2025		001-35521
10-K/A	Open Document \| Data	Open Filing	FORM 10-K/A	May 28, 2025	Dec 31, 2024	001-35521
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	May 27, 2025	May 22, 2025
3	Open Document	Open Filing	OWNERSHIP DOCUMENT	May 27, 2025	May 22, 2025
3	Open Document	Open Filing	OWNERSHIP DOCUMENT	May 27, 2025	May 22, 2025
8-K	Open Document \| Data	Open Filing	FORM 8-K	May 27, 2025	May 22, 2025	001-35521
8-K	Open Document \| Data	Open Filing	FORM 8-K	May 23, 2025	May 21, 2025	001-35521
10-Q	Open Document \| Data	Open Filing	10-Q	May 15, 2025	Mar 31, 2025	001-35521
3	Open Document	Open Filing	PRIMARY DOCUMENT	Apr 9, 2025	Feb 14, 2025
SCHEDULE 13G	Open Document	Open Filing		Apr 9, 2025		005-86820
8-K	Open Document \| Data	Open Filing	FORM 8-K	Apr 4, 2025	Apr 1, 2025	001-35521
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Apr 3, 2025	Apr 1, 2025
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Apr 3, 2025	Apr 1, 2025
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Apr 3, 2025	Apr 1, 2025
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Apr 3, 2025	Apr 1, 2025
S-8	Open Document	Open Filing	FORM S-8	Mar 31, 2025		333-286268
10-K	Open Document \| Data	Open Filing	10-K	Mar 31, 2025	Dec 31, 2024	001-35521
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Feb 25, 2025	Feb 24, 2025
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Feb 24, 2025	Feb 20, 2025
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Feb 24, 2025	Feb 20, 2025
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Feb 21, 2025	May 20, 2024
SCHEDULE 13D/A	Open Document	Open Filing		Feb 19, 2025		005-86820
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Jan 6, 2025	Jan 2, 2025
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Jan 6, 2025	Jan 2, 2025
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Jan 6, 2025	Jan 2, 2025
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Jan 6, 2025	Jan 2, 2025
8-K	Open Document \| Data	Open Filing	FORM 8-K	Dec 9, 2024	Dec 6, 2024	001-35521
8-K	Open Document \| Data	Open Filing	FORM 8-K	Nov 21, 2024	Nov 20, 2024	001-35521
10-Q	Open Document \| Data	Open Filing	10-Q	Nov 14, 2024	Sep 30, 2024	001-35521
UPLOAD	Open Document	Open Filing		Nov 8, 2024		001-35521
CORRESP	Open Document	Open Filing		Nov 7, 2024
10-K/A	Open Document \| Data	Open Filing	10-K/A	Nov 7, 2024	Dec 31, 2023	001-35521
8-K	Open Document \| Data	Open Filing	FORM 8-K	Oct 30, 2024	Oct 30, 2024	001-35521
UPLOAD	Open Document	Open Filing		Oct 29, 2024		001-35521
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Oct 3, 2024	Oct 1, 2024
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Oct 3, 2024	Oct 1, 2024
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Oct 3, 2024	Oct 1, 2024
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Oct 3, 2024	Oct 1, 2024
8-K	Open Document \| Data	Open Filing	FORM 8-K	Oct 1, 2024	Oct 1, 2024	001-35521
8-K/A	Open Document \| Data	Open Filing	FORM 8-K/A	Aug 23, 2024	Jun 24, 2024	001-35521
8-K	Open Document \| Data	Open Filing	FORM 8-K	Aug 23, 2024	Aug 21, 2024	001-35521
10-Q	Open Document \| Data	Open Filing	10-Q	Aug 14, 2024	Jun 30, 2024	001-35521
8-K	Open Document \| Data	Open Filing	FORM 8-K	Aug 6, 2024	Aug 1, 2024	001-35521
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Aug 5, 2024	Aug 1, 2024
3	Open Document	Open Filing	OWNERSHIP DOCUMENT	Aug 5, 2024	Aug 1, 2024
424B4	Open Document	Open Filing	424B4	Jul 15, 2024		333-279550
EFFECT	Open Document	Open Filing		Jul 12, 2024		333-279550
CORRESP	Open Document	Open Filing		Jul 10, 2024
D	Open Document	Open Filing		Jul 9, 2024		021-518022
4	Open Document	Open Filing	OWNERSHIP DOCUMENT	Jul 3, 2024	Jul 1, 2024

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