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 |
| 3 | Initial insider ownership | Aug 11, 2026 | Aug 6, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 24, 2026 | — |
| 4 | Insider transaction | Jul 24, 2026 | Jul 22, 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 |
| 4/A | Ownership document | Apr 27, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Apr 27, 2026 | Apr 23, 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 |
| 4 | Insider transaction | Mar 19, 2026 | Mar 16, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 4, 2026 | Feb 2, 2026 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 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 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| 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 |
| 3 | Initial insider ownership | Apr 9, 2025 | Feb 14, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 9, 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 |
| 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 |
| 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 |
| 4 | Insider transaction | Aug 5, 2024 | Aug 1, 2024 |
| 3 | Initial insider ownership | Aug 5, 2024 | Aug 1, 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 |
| 4 | Insider transaction | Jun 26, 2024 | Jun 24, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Jun 26, 2024 | — |
| 4 | Insider transaction | Apr 25, 2024 | Apr 23, 2024 |
| 3 | Initial insider ownership | Apr 25, 2024 | Apr 23, 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 4 | Insider transaction | Jul 6, 2023 | Jul 3, 2023 |
| 4 | Insider transaction | Jul 6, 2023 | Jul 3, 2023 |
| 4 | Insider transaction | Jul 6, 2023 | Jul 3, 2023 |
| 4 | Insider transaction | Jul 6, 2023 | Jul 3, 2023 |
| 4 | Insider transaction | Apr 5, 2023 | Apr 3, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Apr 3, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Apr 3, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Apr 3, 2023 |
| 4 | Insider transaction | Feb 23, 2023 | Feb 23, 2023 |
| 3 | Initial insider ownership | Feb 23, 2023 | Feb 21, 2023 |
| 4 | Insider transaction | Feb 14, 2023 | Feb 2, 2023 |
| 4 | Insider transaction | Feb 14, 2023 | Feb 2, 2023 |
| 4 | Insider transaction | Jan 4, 2023 | Jan 3, 2023 |
| 4 | Insider transaction | Jan 4, 2023 | Jan 3, 2023 |
| 4 | Insider transaction | Jan 4, 2023 | Jan 3, 2023 |
| 4 | Insider transaction | Jan 4, 2023 | Jan 3, 2023 |
| 4 | Insider transaction | Oct 4, 2022 | Oct 3, 2022 |
| 4 | Insider transaction | Oct 4, 2022 | Oct 3, 2022 |
| 4 | Insider transaction | Oct 4, 2022 | Oct 3, 2022 |
| 4 | Insider transaction | Oct 4, 2022 | Oct 3, 2022 |
| 4 | Insider transaction | Aug 25, 2022 | Aug 24, 2022 |
| 3 | Initial insider ownership | Aug 4, 2022 | Aug 1, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | Jul 18, 2022 | — |
| 4 | Insider transaction | Jul 13, 2022 | Jul 8, 2022 |
| 4 | Insider transaction | Jul 7, 2022 | Jul 1, 2022 |
| 4 | Insider transaction | Jul 6, 2022 | Jul 1, 2022 |
| 4 | Insider transaction | Jul 6, 2022 | Jul 1, 2022 |
| 4 | Insider transaction | Jul 6, 2022 | Jul 1, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 14, 2022 |
| 4 | Insider transaction | Apr 4, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 4, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 4, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 4, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Feb 9, 2022 | Jan 7, 2022 |
| 4 | Insider transaction | Jan 5, 2022 | Jan 3, 2022 |
| 4 | Insider transaction | Jan 5, 2022 | Jan 3, 2022 |
| 4 | Insider transaction | Jan 5, 2022 | Jan 3, 2022 |
| 4 | Insider transaction | Jan 5, 2022 | Jan 3, 2022 |
| 4 | Insider transaction | Nov 18, 2021 | Nov 16, 2021 |
| 4 | Insider transaction | Nov 18, 2021 | Nov 16, 2021 |
| 4 | Insider transaction | Nov 18, 2021 | Nov 16, 2021 |
| 4 | Insider transaction | Nov 18, 2021 | Nov 16, 2021 |
| 4 | Insider transaction | Oct 18, 2021 | Oct 18, 2021 |
| 3 | Initial insider ownership | Oct 18, 2021 | Oct 18, 2021 |
| 4 | Insider transaction | Aug 26, 2021 | Aug 24, 2021 |
| 4 | Insider transaction | Aug 26, 2021 | Aug 24, 2021 |
| 4 | Insider transaction | Aug 26, 2021 | Aug 24, 2021 |
| 4 | Insider transaction | Aug 26, 2021 | Aug 24, 2021 |
| 4 | Insider transaction | Jul 30, 2021 | Jul 28, 2021 |
| 3 | Initial insider ownership | Mar 11, 2021 | Mar 4, 2021 |
| 4 | Insider transaction | Jan 25, 2021 | Jan 22, 2021 |
| 4 | Insider transaction | Jan 25, 2021 | Jan 22, 2021 |
| 4 | Insider transaction | Jan 25, 2021 | Jan 22, 2021 |
| 4 | Insider transaction | Jan 12, 2021 | Jan 10, 2021 |
| 4 | Insider transaction | Jan 12, 2021 | Jan 10, 2021 |
| 4 | Insider transaction | Jan 5, 2021 | Jan 3, 2021 |
| 4 | Insider transaction | Nov 23, 2020 | Nov 19, 2020 |
| 4 | Insider transaction | Nov 23, 2020 | Nov 19, 2020 |
| 4 | Insider transaction | Nov 23, 2020 | Nov 19, 2020 |
| SC 13D/A | Amended ownership over 5% (active) | Oct 7, 2020 | — |
| 4 | Insider transaction | Aug 26, 2020 | Aug 24, 2020 |
| 4 | Insider transaction | Aug 26, 2020 | Aug 24, 2020 |
| 4 | Insider transaction | Aug 20, 2020 | Aug 18, 2020 |
| 4 | Insider transaction | Aug 20, 2020 | Aug 18, 2020 |
| 4 | Insider transaction | Aug 20, 2020 | Aug 18, 2020 |
| 4 | Insider transaction | May 20, 2020 | May 18, 2020 |
| 4 | Insider transaction | May 20, 2020 | May 18, 2020 |
| 4 | Insider transaction | May 20, 2020 | May 18, 2020 |
| 4 | Insider transaction | May 20, 2020 | May 18, 2020 |
| 4 | Insider transaction | Apr 3, 2020 | Apr 1, 2020 |
| 4 | Insider transaction | Apr 3, 2020 | Apr 1, 2020 |
| 4 | Insider transaction | Apr 3, 2020 | Apr 1, 2020 |
| 4 | Insider transaction | Apr 3, 2020 | Apr 1, 2020 |
| 4 | Insider transaction | Feb 14, 2020 | Feb 12, 2020 |
| 4 | Insider transaction | Jan 14, 2020 | Jan 9, 2020 |
| 4 | Insider transaction | Jan 14, 2020 | Jan 9, 2020 |
| 4 | Insider transaction | Jan 13, 2020 | Jan 9, 2020 |
| 4/A | Ownership document | Oct 31, 2019 | May 9, 2019 |
| 4/A | Ownership document | Oct 31, 2019 | May 9, 2019 |
| 4/A | Ownership document | Oct 31, 2019 | May 9, 2019 |
| 4/A | Ownership document | Oct 31, 2019 | May 9, 2019 |
| 4/A | Ownership document | Oct 31, 2019 | May 9, 2019 |
| SC 13D/A | Amended ownership over 5% (active) | Jul 8, 2019 | — |
| 4 | Insider transaction | Jul 3, 2019 | Jun 30, 2019 |
| 4 | Insider transaction | Jul 3, 2019 | Jun 30, 2019 |
| 4 | Insider transaction | Jul 3, 2019 | Jun 30, 2019 |
| 4 | Insider transaction | Jul 3, 2019 | Jun 30, 2019 |
| 4 | Insider transaction | Jul 3, 2019 | Jun 30, 2019 |
| 4 | Insider transaction | May 20, 2019 | May 17, 2019 |
| 4 | Insider transaction | May 13, 2019 | May 9, 2019 |
| 4 | Insider transaction | May 13, 2019 | May 9, 2019 |
| 4 | Insider transaction | May 13, 2019 | May 9, 2019 |
| 4 | Insider transaction | May 13, 2019 | May 9, 2019 |
| 4 | Insider transaction | May 13, 2019 | May 9, 2019 |
| 4 | Insider transaction | Mar 20, 2019 | Mar 19, 2019 |
| 4 | Insider transaction | Feb 8, 2019 | Feb 6, 2019 |
| 4 | Insider transaction | Feb 8, 2019 | Feb 6, 2019 |
| 4 | Insider transaction | Feb 8, 2019 | Feb 6, 2019 |
| 3 | Initial insider ownership | Jan 31, 2019 | Jan 28, 2019 |
| 3 | Initial insider ownership | Jan 31, 2019 | Jan 29, 2019 |
| SC 13D | Ownership over 5% (active) | Jan 18, 2019 | — |
| 3 | Initial insider ownership | Jan 18, 2019 | Jan 8, 2019 |
| 4 | Insider transaction | Jan 4, 2019 | Dec 31, 2018 |
| 4 | Insider transaction | Jan 4, 2019 | Dec 31, 2018 |
| 4 | Insider transaction | Jan 4, 2019 | Dec 31, 2018 |
| 4 | Insider transaction | Jan 4, 2019 | Dec 31, 2018 |
| 4 | Insider transaction | Dec 19, 2018 | Dec 18, 2018 |
| 4 | Insider transaction | Oct 2, 2018 | Sep 28, 2018 |
| 4 | Insider transaction | Oct 2, 2018 | Sep 28, 2018 |
| 4 | Insider transaction | Oct 2, 2018 | Sep 28, 2018 |
| 4 | Insider transaction | Oct 2, 2018 | Oct 1, 2018 |
| 4 | Insider transaction | Oct 2, 2018 | Sep 28, 2018 |
| 3 | Initial insider ownership | Aug 31, 2018 | Aug 23, 2018 |
| 3 | Initial insider ownership | Aug 6, 2018 | Jul 20, 2018 |
| 3 | Initial insider ownership | Jul 30, 2018 | Jul 20, 2018 |
| 3 | Initial insider ownership | Jul 30, 2018 | Jul 20, 2018 |
| SC 13D | Ownership over 5% (active) | Jul 30, 2018 | — |
| 4 | Insider transaction | Jul 3, 2018 | Jun 29, 2018 |
| 4 | Insider transaction | Jul 3, 2018 | Jun 29, 2018 |
| 4 | Insider transaction | Jul 3, 2018 | Jun 29, 2018 |
| 4 | Insider transaction | Jul 3, 2018 | Jun 29, 2018 |
| 4 | Insider transaction | Apr 26, 2018 | Apr 12, 2018 |
| 4 | Insider transaction | Apr 16, 2018 | Apr 12, 2018 |
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.