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 |
|---|---|---|---|
| D | Filing | Jul 31, 2026 | — |
| EFFECT | Filing | Aug 21, 2025 | — |
| CORRESP | Letter to the SEC | Aug 20, 2025 | — |
| UPLOAD | Letter from the SEC | Aug 14, 2025 | — |
| EFFECT | Filing | Jul 28, 2025 | — |
| CORRESP | Letter to the SEC | Jul 24, 2025 | — |
| UPLOAD | Letter from the SEC | Jul 24, 2025 | — |
| PREC14A | Filing | May 29, 2025 | — |
| UPLOAD | Letter from the SEC | Nov 8, 2024 | — |
| CORRESP | Letter to the SEC | Nov 7, 2024 | — |
| UPLOAD | Letter from the SEC | Oct 29, 2024 | — |
| EFFECT | Filing | Jul 12, 2024 | — |
| CORRESP | Letter to the SEC | Jul 10, 2024 | — |
| D | Filing | Jul 9, 2024 | — |
| UPLOAD | Letter from the SEC | May 29, 2024 | — |
| D | Filing | May 8, 2024 | — |
| EFFECT | Filing | Aug 30, 2023 | — |
| 8-A12B/A | Filing | Aug 14, 2023 | — |
| 8-A12B/A | Filing | Aug 11, 2023 | — |
| EFFECT | Filing | Aug 12, 2022 | — |
| CORRESP | Letter to the SEC | Aug 10, 2022 | — |
| CORRESP | Letter to the SEC | Jul 19, 2022 | — |
| UPLOAD | Letter from the SEC | Jul 14, 2022 | — |
| UPLOAD | Letter from the SEC | Jan 5, 2022 | — |
| CORRESP | Letter to the SEC | Dec 23, 2021 | — |
| UPLOAD | Letter from the SEC | Dec 16, 2021 | — |
| NT 10-Q | Filing | Aug 16, 2021 | Jun 30, 2021 |
| D | Filing | Oct 2, 2020 | — |
| EFFECT | Filing | Jul 12, 2019 | — |
| CORRESP | Letter to the SEC | Jul 10, 2019 | — |
| UPLOAD | Letter from the SEC | Jul 10, 2019 | — |
| 25-NSE | Delisting notice | Jan 25, 2019 | — |
| PRRN14A | Filing | Dec 6, 2018 | — |
| UPLOAD | Letter from the SEC | Nov 19, 2018 | — |
| PREC14A | Filing | Nov 19, 2018 | — |
| PREN14A | Filing | Nov 9, 2018 | Nov 9, 2018 |
| EFFECT | Filing | Sep 21, 2018 | — |
| CORRESP | Letter to the SEC | Sep 19, 2018 | — |
| UPLOAD | Letter from the SEC | Sep 19, 2018 | — |
| D | Filing | Jul 23, 2018 | — |
| RW | Registration withdrawal | Dec 6, 2017 | — |
| CERTNAS | Auto-generated paper document | Jan 25, 2017 | — |
| 8-A12B | Filing | Jan 24, 2017 | — |
| CERTNAS | Auto-generated paper document | Jan 25, 2016 | — |
| EFFECT | Filing | Jan 7, 2016 | — |
| CORRESP | Letter to the SEC | Jan 5, 2016 | — |
| UPLOAD | Letter from the SEC | Jan 4, 2016 | — |
| DEFR14A | Form defr14a | Apr 1, 2015 | — |
| EFFECT | Filing | May 30, 2013 | — |
| EFFECT | Filing | Apr 25, 2012 | — |
| CERTNAS | Auto-generated paper document | Apr 24, 2012 | — |
| EFFECT | Filing | Apr 24, 2012 | — |
| 8-A12B | Form 8-a12b | Apr 23, 2012 | — |
| CORRESP | Letter to the SEC | Apr 20, 2012 | — |
| CORRESP | Letter to the SEC | Apr 20, 2012 | — |
| UPLOAD | Letter from the SEC | Feb 17, 2012 | — |
| UPLOAD | Letter from the SEC | Jan 17, 2012 | — |
| UPLOAD | Letter from the SEC | Dec 12, 2011 | — |
| D | Filing | Mar 18, 2011 | — |
| D/A | Filing | Feb 3, 2011 | — |
| REGDEX | Auto-generated paper document | May 5, 2008 | — |
Showing 61 filings. 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
- Danaher Corp /DE/ DHR
- Ametek INC/ AME
- Keysight Technologies, Inc. KEYS
- Roper Technologies Inc ROP
- Fortive Corp FTV
- MKS Inc MKSI
- Cognex Corp CGNX
- Ralliant Corp RAL
All 18 Industrial Instruments For Measurement, Display, and Control companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.