ClearSign Technologies Corp SEC filings CLIR
ClearSign Technologies Corp has 794 filings in SEC EDGAR's recent list, going back to May 5, 2008. Its latest annual report, Form ARS, was filed on Apr 28, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 14, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Sep 14, 2026 (regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 14, 2026 | Sep 14, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 20, 2026 | Aug 19, 2026 |
| 10-Q | Quarterly report | Aug 14, 2026 | Jun 30, 2026 |
| 3 | Initial insider ownership | Aug 11, 2026 | Aug 6, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Aug 11, 2026 | Aug 6, 2026 |
| D | Filing | Jul 31, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 24, 2026 | — |
| 4 | Insider transaction | Jul 24, 2026 | Jul 22, 2026 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure
|
Jul 23, 2026 | Jul 21, 2026 |
| S-8 | Employee stock plan registration | Jul 6, 2026 | — |
| 8-K |
Current report
Other events
|
Jul 6, 2026 | Jul 6, 2026 |
| 424B5 | Prospectus supplement | Jul 6, 2026 | — |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Other events
|
Jun 18, 2026 | Jun 18, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 9, 2026 | Jun 8, 2026 |
| 8-K |
Current report
Material agreement, Other events
|
Jun 1, 2026 | May 28, 2026 |
| 424B5 | Prospectus supplement | Jun 1, 2026 | — |
| 424B5 | Prospectus supplement | May 28, 2026 | — |
| 8-K |
Current report
Other events
|
May 28, 2026 | May 26, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 21, 2026 | May 20, 2026 |
| 10-Q | Quarterly report | May 15, 2026 | Mar 31, 2026 |
| ARS | Annual report to shareholders | Apr 28, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 28, 2026 | — |
| DEF 14A | Proxy statement | Apr 28, 2026 | Jun 8, 2026 |
| 4/A | Ownership document | Apr 27, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Apr 27, 2026 | Apr 23, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Apr 10, 2026 | Apr 9, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 10-K | Annual report | Mar 31, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Other events
|
Mar 30, 2026 | Mar 30, 2026 |
| 4 | Insider transaction | Mar 19, 2026 | Mar 16, 2026 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Regulation FD disclosure
|
Mar 10, 2026 | Mar 6, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Mar 4, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 26, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 25, 2026 | Feb 24, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 4, 2026 | Feb 2, 2026 |
| DEF 14A | Proxy statement | Feb 2, 2026 | Feb 26, 2026 |
| PRE 14A | Preliminary proxy statement | Jan 23, 2026 | Feb 26, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jan 7, 2026 | Jan 7, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 8, 2025 | Dec 8, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 21, 2025 | Nov 19, 2025 |
| 8-K |
Current report
Bylaw or fiscal year change, Other events
|
Nov 17, 2025 | Nov 11, 2025 |
| 10-Q | Quarterly report | Nov 14, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 8-K |
Current report
Listing notice
|
Sep 30, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Other events
|
Aug 29, 2025 | Aug 26, 2025 |
| 424B4 | Prospectus | Aug 22, 2025 | — |
| EFFECT | Filing | Aug 21, 2025 | — |
| CORRESP | Letter to the SEC | Aug 20, 2025 | — |
| S-1/A | Amended registration statement | Aug 20, 2025 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 15, 2025 | Aug 14, 2025 |
| UPLOAD | Letter from the SEC | Aug 14, 2025 | — |
| 10-Q | Quarterly report | Aug 14, 2025 | Jun 30, 2025 |
| S-1 | Registration statement | Aug 12, 2025 | — |
| 8-K |
Current report
Listing notice, Officer or director change, Other events
|
Aug 8, 2025 | Aug 4, 2025 |
| EFFECT | Filing | Jul 28, 2025 | — |
| 8-K |
Current report
Shareholder vote results
|
Jul 28, 2025 | Jul 25, 2025 |
| CORRESP | Letter to the SEC | Jul 24, 2025 | — |
| UPLOAD | Letter from the SEC | Jul 24, 2025 | — |
| 8-K |
Current report
Material agreement, Other events
|
Jul 18, 2025 | Jul 12, 2025 |
| S-3 | Shelf registration | Jul 17, 2025 | — |
| DEFA14A | Additional proxy material | Jul 11, 2025 | — |
| 8-K |
Current report
Other events
|
Jul 11, 2025 | Jun 27, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| ARS | Annual report to shareholders | Jun 13, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Jun 13, 2025 | — |
| DEF 14A | Proxy statement | Jun 13, 2025 | Jul 25, 2025 |
| PREC14A | Filing | May 29, 2025 | — |
| 10-K/A | Amended annual report | May 28, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | May 27, 2025 | May 22, 2025 |
| 3 | Initial insider ownership | May 27, 2025 | May 22, 2025 |
| 3 | Initial insider ownership | May 27, 2025 | May 22, 2025 |
| 8-K |
Current report
Material agreement, Officer or director change, Regulation FD disclosure
|
May 27, 2025 | May 22, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 23, 2025 | May 21, 2025 |
| 10-Q | Quarterly report | May 15, 2025 | Mar 31, 2025 |
| 3 | Initial insider ownership | Apr 9, 2025 | Feb 14, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 9, 2025 | — |
| 8-K |
Current report
Results of operations, Listing notice, Regulation FD disclosure
|
Apr 4, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| S-8 | Employee stock plan registration | Mar 31, 2025 | — |
| 10-K | Annual report | Mar 31, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | May 20, 2024 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Feb 19, 2025 | — |
| 4 | Insider transaction | Jan 6, 2025 | Jan 2, 2025 |
| 4 | Insider transaction | Jan 6, 2025 | Jan 2, 2025 |
| 4 | Insider transaction | Jan 6, 2025 | Jan 2, 2025 |
| 4 | Insider transaction | Jan 6, 2025 | Jan 2, 2025 |
| 8-K |
Current report
Other events
|
Dec 9, 2024 | Dec 6, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 21, 2024 | Nov 20, 2024 |
| 10-Q | Quarterly report | Nov 14, 2024 | Sep 30, 2024 |
| UPLOAD | Letter from the SEC | Nov 8, 2024 | — |
| CORRESP | Letter to the SEC | Nov 7, 2024 | — |
| 10-K/A | Amended annual report | Nov 7, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Listing notice
|
Oct 30, 2024 | Oct 30, 2024 |
| UPLOAD | Letter from the SEC | Oct 29, 2024 | — |
| 4 | Insider transaction | Oct 3, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 3, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 3, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 3, 2024 | Oct 1, 2024 |
| 8-K |
Current report
Exit or restructuring costs
|
Oct 1, 2024 | Oct 1, 2024 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Aug 23, 2024 | Jun 24, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 23, 2024 | Aug 21, 2024 |
| 10-Q | Quarterly report | Aug 14, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Aug 6, 2024 | Aug 1, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Aug 1, 2024 |
| 3 | Initial insider ownership | Aug 5, 2024 | Aug 1, 2024 |
| 424B4 | Prospectus | Jul 15, 2024 | — |
| EFFECT | Filing | Jul 12, 2024 | — |
| CORRESP | Letter to the SEC | Jul 10, 2024 | — |
| D | Filing | Jul 9, 2024 | — |
| 4 | Insider transaction | Jul 3, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jul 1, 2024 |
| S-1/A | Amended registration statement | Jul 3, 2024 | — |
| 8-K/A |
Amended current report
Shareholder vote results
|
Jun 28, 2024 | Jun 24, 2024 |
| 4 | Insider transaction | Jun 26, 2024 | Jun 24, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Jun 26, 2024 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Bylaw or fiscal year change, Shareholder vote results
|
Jun 26, 2024 | Jun 24, 2024 |
| DEFA14A | Additional proxy material | Jun 20, 2024 | — |
| 8-K |
Current report
Officer or director change, Other events
|
Jun 20, 2024 | Jun 16, 2024 |
| DEFA14A | Additional proxy material | Jun 10, 2024 | — |
| 8-K |
Current report
Other events
|
Jun 7, 2024 | Jun 3, 2024 |
| UPLOAD | Letter from the SEC | May 29, 2024 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 28, 2024 | May 23, 2024 |
| S-1 | Registration statement | May 20, 2024 | — |
| 10-Q | Quarterly report | May 15, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Unregistered share sale, Other events
|
May 10, 2024 | May 10, 2024 |
| ARS | Annual report to shareholders | May 10, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | May 10, 2024 | — |
| DEF 14A | Proxy statement | May 10, 2024 | Jun 25, 2024 |
| D | Filing | May 8, 2024 | — |
| 8-K |
Current report
Listing notice, Other events
|
May 3, 2024 | May 2, 2024 |
| PRE 14A | Preliminary proxy statement | Apr 30, 2024 | Jun 25, 2024 |
| 10-K/A | Amended annual report | Apr 26, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Apr 25, 2024 | Apr 23, 2024 |
| 4 | Insider transaction | Apr 25, 2024 | Apr 23, 2024 |
| 3 | Initial insider ownership | Apr 25, 2024 | Apr 23, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure, Other events
|
Apr 24, 2024 | Apr 23, 2024 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Apr 23, 2024 | Apr 22, 2024 |
| 424B5 | Prospectus supplement | Apr 23, 2024 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure
|
Apr 19, 2024 | Apr 19, 2024 |
| 424B5 | Prospectus supplement | Apr 19, 2024 | — |
| 4/A | Ownership document | Apr 10, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| S-8 | Employee stock plan registration | Apr 1, 2024 | — |
| 10-K | Annual report | Apr 1, 2024 | Dec 31, 2023 |
| FWP | Free writing prospectus | Mar 19, 2024 | — |
| 424B5 | Prospectus supplement | Mar 18, 2024 | — |
| 424B5 | Prospectus supplement | Mar 18, 2024 | — |
| 4 | Insider transaction | Feb 26, 2024 | Feb 22, 2024 |
| 4/A | Ownership document | Feb 26, 2024 | Feb 2, 2024 |
| 4/A | Ownership document | Feb 26, 2024 | Feb 2, 2023 |
| 4 | Insider transaction | Feb 26, 2024 | Feb 22, 2024 |
| 4/A | Ownership document | Feb 26, 2024 | Feb 2, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 7, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 6, 2024 | Feb 2, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Feb 5, 2024 | — |
| 4 | Insider transaction | Feb 2, 2024 | Feb 1, 2024 |
| 8-K |
Current report
Material agreement
|
Jan 5, 2024 | Dec 30, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 2, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 2, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 2, 2024 |
| 8-K |
Current report
Listing notice
|
Nov 27, 2023 | Nov 24, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 15, 2023 | Nov 14, 2023 |
| 10-Q | Quarterly report | Nov 14, 2023 | Sep 30, 2023 |
| 4 | Insider transaction | Oct 4, 2023 | Oct 2, 2023 |
| 4 | Insider transaction | Oct 4, 2023 | Oct 2, 2023 |
| 4 | Insider transaction | Oct 4, 2023 | Oct 2, 2023 |
| 4 | Insider transaction | Oct 4, 2023 | Oct 2, 2023 |
| 8-K |
Current report
Other events
|
Sep 22, 2023 | Sep 20, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Sep 1, 2023 | Aug 31, 2023 |
| 424B3 | Prospectus | Sep 1, 2023 | — |
| EFFECT | Filing | Aug 30, 2023 | — |
| 8-K |
Current report
Other events
|
Aug 29, 2023 | Aug 29, 2023 |
| 8-A12B/A | Filing | Aug 14, 2023 | — |
| 10-Q | Quarterly report | Aug 14, 2023 | Jun 30, 2023 |
| 8-A12B/A | Filing | Aug 11, 2023 | — |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Industrial Instruments For Measurement, Display, and Control (SIC 3823)
- Listed as
- CLIR (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Tulsa, OK
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1434524
- Former names
- CLEARSIGN COMBUSTION CORP (until Oct 31, 2019)
Other Industrial Instruments For Measurement, Display, and Control companies
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All 18 Industrial Instruments For Measurement, Display, and Control companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.