Company facts
- Headquarters
- Tulsa, Oklahoma
- Most recent report
- 8-K, filed Aug 20, 2026
- Incorporated
- Delaware
- Filings on record
- 789 filings
- On EDGAR
- CIK 1434524
- Fiscal year ends
- December
- Filer status
- Non-accelerated filer, Smaller reporting company
Financials 8 of 64
News 8 of 192
Prospectuses and Registrations 8 of 66
- S-8 Registration statement for an employee plan Jul 6, 2026
- 424B5 Prospectus supplement for an offering Jul 6, 2026
- 424B5 Prospectus supplement for an offering Jun 1, 2026
- 424B5 Prospectus supplement for an offering May 28, 2026
- 424B4 Final prospectus for an offering Aug 22, 2025
- S-1/A Registration statement for an offering, amended Aug 20, 2025
- S-1 Registration statement for an offering Aug 12, 2025
- S-3 Shelf registration statement Jul 17, 2025
Proxies 8 of 29
- DEFA14A Extra proxy material Apr 28, 2026
- DEF 14A Proxy statement for a shareholder vote Apr 28, 2026
- DEF 14A Proxy statement for a shareholder vote Feb 2, 2026
- PRE 14A Preliminary proxy statement Jan 23, 2026
- DEFA14A Extra proxy material Jul 11, 2025
- DEFA14A Extra proxy material Jun 13, 2025
- DEF 14A Proxy statement for a shareholder vote Jun 13, 2025
- DEFA14A Extra proxy material Jun 20, 2024
Ownership 8 of 375
- 3 Insider reported their initial holding Aug 11, 2026
- SCHEDULE 13G/A Large holder reported a passive stake, amended Jul 24, 2026
- 4 Insider reported a trade Jul 24, 2026
- 4 Insider reported a trade Jul 2, 2026
- 4 Insider reported a trade Jul 2, 2026
- 4 Insider reported a trade Jul 2, 2026
- 4/A Insider reported a trade, amended Apr 27, 2026
- 4 Insider reported a trade Apr 27, 2026
Other 8 of 63
- D Jul 31, 2026
- ARS Annual report sent to shareholders Apr 28, 2026
- EFFECT Notice that a registration became effective Aug 21, 2025
- CORRESP Reply to SEC staff Aug 20, 2025
- UPLOAD Comment letter from SEC staff Aug 14, 2025
- EFFECT Notice that a registration became effective Jul 28, 2025
- CORRESP Reply to SEC staff Jul 24, 2025
- UPLOAD Comment letter from SEC staff Jul 24, 2025
Everything here comes from ClearSign Technologies Corp's own filings on SEC EDGAR. The filing list is rechecked every hour.