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 |
|---|---|---|---|
| 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 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Aug 11, 2026 | Aug 6, 2026 |
| D | Filing | Jul 31, 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 | — |
| 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 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Apr 10, 2026 | Apr 9, 2026 |
| 10-K | Annual report | Mar 31, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Other events
|
Mar 30, 2026 | Mar 30, 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 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 25, 2026 | Feb 24, 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 |
| 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 |
| 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 |
| 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 |
| 8-K |
Current report
Results of operations, Listing notice, Regulation FD disclosure
|
Apr 4, 2025 | Apr 1, 2025 |
| S-8 | Employee stock plan registration | Mar 31, 2025 | — |
| 10-K | Annual report | Mar 31, 2025 | Dec 31, 2024 |
| 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 | — |
| 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 |
| 424B4 | Prospectus | Jul 15, 2024 | — |
| EFFECT | Filing | Jul 12, 2024 | — |
| CORRESP | Letter to the SEC | Jul 10, 2024 | — |
| D | Filing | Jul 9, 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 |
| 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 |
| 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 | — |
| 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 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 7, 2024 | Feb 7, 2024 |
| 8-K |
Current report
Material agreement
|
Jan 5, 2024 | Dec 30, 2023 |
| 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 |
| 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 | — |
| S-3 | Shelf registration | Aug 11, 2023 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Bylaw or fiscal year change, Regulation FD disclosure
|
Jun 15, 2023 | Jun 14, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Jun 8, 2023 | Jun 6, 2023 |
| 8-K |
Current report
Other events
|
May 30, 2023 | May 25, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 24, 2023 | May 18, 2023 |
| 10-Q | Quarterly report | May 15, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Listing notice
|
May 2, 2023 | May 2, 2023 |
| ARS | Annual report to shareholders | Apr 26, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Apr 25, 2023 | — |
| DEF 14A | Proxy statement | Apr 25, 2023 | Jun 6, 2023 |
| PRE 14A | Preliminary proxy statement | Apr 14, 2023 | Jun 6, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Apr 7, 2023 | Apr 6, 2023 |
| S-8 | Employee stock plan registration | Mar 31, 2023 | — |
| 10-K | Annual report | Mar 31, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Feb 24, 2023 | Feb 18, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 9, 2022 | Dec 1, 2022 |
| 10-Q | Quarterly report | Nov 14, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Listing notice
|
Nov 4, 2022 | Nov 1, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Sep 6, 2022 | Sep 1, 2022 |
| 10-Q | Quarterly report | Aug 15, 2022 | Jun 30, 2022 |
| EFFECT | Filing | Aug 12, 2022 | — |
| CORRESP | Letter to the SEC | Aug 10, 2022 | — |
| 8-K |
Current report
Officer or director change
|
Aug 2, 2022 | Jul 28, 2022 |
| S-3/A | Filing | Jul 29, 2022 | — |
| CORRESP | Letter to the SEC | Jul 19, 2022 | — |
| UPLOAD | Letter from the SEC | Jul 14, 2022 | — |
| S-3 | Shelf registration | Jul 1, 2022 | — |
| 8-K |
Current report
Results of operations, Shareholder vote results, Regulation FD disclosure
|
Jun 7, 2022 | Jun 2, 2022 |
| 8-K |
Current report
Other events
|
Jun 1, 2022 | Jun 1, 2022 |
| 8-K |
Current report
Material agreement, Other events
|
May 31, 2022 | May 26, 2022 |
| 424B5 | Prospectus supplement | May 31, 2022 | — |
| 424B5 | Prospectus supplement | May 26, 2022 | — |
| 10-Q | Quarterly report | May 16, 2022 | Mar 31, 2022 |
| S-8 | Employee stock plan registration | Apr 26, 2022 | — |
| DEFA14A | Additional proxy material | Apr 22, 2022 | — |
| DEF 14A | Proxy statement | Apr 22, 2022 | Jun 6, 2022 |
| 424B5 | Prospectus supplement | Apr 14, 2022 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Apr 8, 2022 | Apr 6, 2022 |
| 10-K | Annual report | Mar 31, 2022 | Dec 31, 2021 |
| UPLOAD | Letter from the SEC | Jan 5, 2022 | — |
| CORRESP | Letter to the SEC | Dec 23, 2021 | — |
| 10-Q/A | Amended quarterly report | Dec 23, 2021 | Sep 30, 2021 |
| 10-Q/A | Amended quarterly report | Dec 23, 2021 | Jun 30, 2021 |
| UPLOAD | Letter from the SEC | Dec 16, 2021 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 29, 2021 | Nov 23, 2021 |
| 10-Q | Quarterly report | Nov 12, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Oct 18, 2021 | Oct 18, 2021 |
| 8-K |
Current report
Results of operations, Bylaw or fiscal year change, Regulation FD disclosure
|
Sep 10, 2021 | Sep 8, 2021 |
| 10-Q | Quarterly report | Aug 20, 2021 | Jun 30, 2021 |
| NT 10-Q | Filing | Aug 16, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jul 30, 2021 | Jul 29, 2021 |
| 8-K |
Current report
Auditor change
|
Jul 7, 2021 | Jul 1, 2021 |
| 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 | — |
| 8-K |
Current report
Results of operations, Shareholder vote results, Regulation FD disclosure
|
Jun 21, 2021 | Jun 15, 2021 |
| 10-Q | Quarterly report | May 17, 2021 | Mar 31, 2021 |
| DEF 14A | Proxy statement | May 7, 2021 | Jun 17, 2021 |
| 10-K/A | Amended annual report | Apr 30, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Officer or director change
|
Apr 23, 2021 | Apr 20, 2021 |
| 8-K/A |
Amended current report
Officer or director change
|
Mar 31, 2021 | Mar 4, 2021 |
| 10-K | Annual report | Mar 31, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations
|
Mar 25, 2021 | Mar 23, 2021 |
| 8-K |
Current report
Officer or director change
|
Mar 8, 2021 | Mar 4, 2021 |
| 8-K |
Current report
Material agreement
|
Dec 23, 2020 | Dec 18, 2020 |
| 424B5 | Prospectus supplement | Dec 23, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 23, 2020 | Nov 19, 2020 |
| 10-Q | Quarterly report | Nov 13, 2020 | Sep 30, 2020 |
| D | Filing | Oct 2, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 17, 2020 | Sep 15, 2020 |
| 8-K |
Current report
Material agreement, Other events
|
Aug 21, 2020 | Aug 19, 2020 |
| 424B2 | Prospectus | Aug 21, 2020 | — |
| 424B2 | Prospectus | Aug 19, 2020 | — |
| 10-Q | Quarterly report | Aug 14, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Other events
|
Jul 13, 2020 | Jul 10, 2020 |
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
- 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.