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 |
|---|---|---|---|
| S-8 | Employee stock plan registration | Jul 6, 2026 | — |
| 424B5 | Prospectus supplement | Jul 6, 2026 | — |
| 424B5 | Prospectus supplement | Jun 1, 2026 | — |
| 424B5 | Prospectus supplement | May 28, 2026 | — |
| 424B4 | Prospectus | Aug 22, 2025 | — |
| S-1/A | Amended registration statement | Aug 20, 2025 | — |
| S-1 | Registration statement | Aug 12, 2025 | — |
| S-3 | Shelf registration | Jul 17, 2025 | — |
| S-8 | Employee stock plan registration | Mar 31, 2025 | — |
| 424B4 | Prospectus | Jul 15, 2024 | — |
| S-1/A | Amended registration statement | Jul 3, 2024 | — |
| S-1 | Registration statement | May 20, 2024 | — |
| 424B5 | Prospectus supplement | Apr 23, 2024 | — |
| 424B5 | Prospectus supplement | Apr 19, 2024 | — |
| S-8 | Employee stock plan registration | Apr 1, 2024 | — |
| FWP | Free writing prospectus | Mar 19, 2024 | — |
| 424B5 | Prospectus supplement | Mar 18, 2024 | — |
| 424B5 | Prospectus supplement | Mar 18, 2024 | — |
| 424B3 | Prospectus | Sep 1, 2023 | — |
| S-3 | Shelf registration | Aug 11, 2023 | — |
| S-8 | Employee stock plan registration | Mar 31, 2023 | — |
| S-3/A | Filing | Jul 29, 2022 | — |
| S-3 | Shelf registration | Jul 1, 2022 | — |
| 424B5 | Prospectus supplement | May 31, 2022 | — |
| 424B5 | Prospectus supplement | May 26, 2022 | — |
| S-8 | Employee stock plan registration | Apr 26, 2022 | — |
| 424B5 | Prospectus supplement | Apr 14, 2022 | — |
| S-8 POS | Filing | Jul 2, 2021 | — |
| S-8 POS | Filing | Jul 2, 2021 | — |
| S-8 | Employee stock plan registration | Jul 2, 2021 | — |
| S-8 POS | Filing | Jul 2, 2021 | — |
| S-8 POS | Form s-8 pos | Jul 2, 2021 | — |
| 424B5 | Prospectus supplement | Dec 23, 2020 | — |
| 424B2 | Prospectus | Aug 21, 2020 | — |
| 424B2 | Prospectus | Aug 19, 2020 | — |
| S-8 | Employee stock plan registration | May 22, 2020 | — |
| S-3 | Shelf registration | Jun 27, 2019 | — |
| S-8 | Employee stock plan registration | Nov 8, 2018 | — |
| 424B3 | Prospectus | Sep 24, 2018 | — |
| S-3 | Shelf registration | Aug 31, 2018 | — |
| 424B5 | Prospectus supplement | Feb 26, 2018 | — |
| 424B5 | Prospectus supplement | Feb 22, 2018 | — |
| S-1/A | Amended registration statement | Nov 27, 2017 | — |
| S-1 | Registration statement | Nov 9, 2017 | — |
| 424B2 | Prospectus | Dec 7, 2016 | — |
| S-3/A | Filing | Jan 5, 2016 | — |
| S-3 | Shelf registration | Dec 29, 2015 | — |
| S-8 | Employee stock plan registration | May 13, 2015 | — |
| 424B5 | Prospectus supplement | Feb 5, 2015 | — |
| 424B5 | Prospectus supplement | Feb 28, 2014 | — |
| S-3 | Shelf registration | May 6, 2013 | — |
| S-8 | Employee stock plan registration | Nov 13, 2012 | — |
| 424B3 | Prospectus | Nov 8, 2012 | — |
| 424B3 | Prospectus | Aug 6, 2012 | — |
| 424B3 | Prospectus | Jul 31, 2012 | — |
| 424B3 | Prospectus | May 15, 2012 | — |
| 424B3 | Prospectus | May 1, 2012 | — |
| POS AM | Post effective amendment to form s-1 | Apr 25, 2012 | — |
| 424B1 | Form 424b1 | Apr 25, 2012 | — |
| S-1/A | Amended registration statement | Apr 18, 2012 | — |
| S-1/A | Amended registration statement | Apr 6, 2012 | — |
| S-1/A | Amended registration statement | Mar 9, 2012 | — |
| S-1/A | Amended registration statement | Feb 7, 2012 | — |
| S-1/A | Amended registration statement | Dec 28, 2011 | — |
| S-1 | Registration statement | Nov 14, 2011 | — |
Showing 65 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.