IPO registrations (S-1, F-1) · Registrants
ClearSign Technologies Corp
- SEC CIK
- 1434524 · filings on EDGAR ↗
- Former names
- CLEARSIGN COMBUSTION CORP (2008–2019)
- Registration
- Form S-1, first filed 2011-11-14, last 2025-08-20; 4 initial registrations, 8 amendments
- Outcome
- Final prospectus filed 2012-04-25; declared effective 2012-04-24; withdrawal requested 2017-12-06
- Industry (SIC)
- Industrial Instruments For Measurement, Display, and Control 3823
- Incorporated in
- DE
- Business address
- 8023 E. 63RD PLACE, SUITE 101, Tulsa, OK 74133
- Ticker
- CLIR (Nasdaq)
- EDGAR entity type
- operating
- Insiders and CEO pay
- ClearSign Technologies Corp on the corporate pages
On this site
- Business registration: CLEARSIGN TECHNOLOGIES CORPORATION Fuzzy (name and state)
- Federal award recipient: CLEARSIGN TECHNOLOGIES CORPORATION Fuzzy (name and state)
- Form D issuer: ClearSign Technologies Corp EXACT (CIK (EXACT))
- SEC filer: CLEARSIGN COMBUSTION CORP EXACT (CIK (EXACT))
Filings 27
| Filed | Form | What it is | Name as filed | EDGAR |
|---|---|---|---|---|
| 2011-11-14 | S-1 | S-1 (registration) | CLEARSIGN COMBUSTION CORP | 0001144204-11-064058 ↗ |
| 2011-12-28 | S-1/A | S-1/A (amendment) | CLEARSIGN COMBUSTION CORP | 0001144204-11-071934 ↗ |
| 2012-02-07 | S-1/A | S-1/A (amendment) | CLEARSIGN COMBUSTION CORP | 0001144204-12-006386 ↗ |
| 2012-03-09 | S-1/A | S-1/A (amendment) | CLEARSIGN COMBUSTION CORP | 0001144204-12-013999 ↗ |
| 2012-04-06 | S-1/A | S-1/A (amendment) | CLEARSIGN COMBUSTION CORP | 0001144204-12-020541 ↗ |
| 2012-04-18 | S-1/A | S-1/A (amendment) | CLEARSIGN COMBUSTION CORP | 0001144204-12-022352 ↗ |
| 2012-04-24 | EFFECT | EFFECT (declared effective) | CLEARSIGN COMBUSTION CORP | 9999999995-12-001140 ↗ |
| 2012-04-25 | 424B1 | 424B1 (final prospectus) | CLEARSIGN COMBUSTION CORP | 0001144204-12-023622 ↗ |
| 2012-04-25 | EFFECT | EFFECT (declared effective) | CLEARSIGN COMBUSTION CORP | 9999999995-12-001170 ↗ |
| 2013-05-30 | EFFECT | EFFECT (declared effective) | CLEARSIGN COMBUSTION CORP | 9999999995-13-001670 ↗ |
| 2016-01-07 | EFFECT | EFFECT (declared effective) | CLEARSIGN COMBUSTION CORP | 9999999995-16-003485 ↗ |
| 2017-11-09 | S-1 | S-1 (registration) | CLEARSIGN COMBUSTION CORP | 0001571049-17-008483 ↗ |
| 2017-11-27 | S-1/A | S-1/A (amendment) | CLEARSIGN COMBUSTION CORP | 0001571049-17-008599 ↗ |
| 2017-12-06 | RW | RW (withdrawal request) | CLEARSIGN COMBUSTION CORP | 0001571049-17-008647 ↗ |
| 2018-09-21 | EFFECT | EFFECT (declared effective) | CLEARSIGN COMBUSTION CORP | 9999999995-18-002434 ↗ |
| 2019-07-12 | EFFECT | EFFECT (declared effective) | CLEARSIGN COMBUSTION CORP | 9999999995-19-001583 ↗ |
| 2022-08-12 | EFFECT | EFFECT (declared effective) | ClearSign Technologies Corp | 9999999995-22-002362 ↗ |
| 2023-08-30 | EFFECT | EFFECT (declared effective) | ClearSign Technologies Corp | 9999999995-23-002534 ↗ |
| 2024-05-20 | S-1 | S-1 (registration) | ClearSign Technologies Corp | 0001104659-24-063437 ↗ |
| 2024-07-03 | S-1/A | S-1/A (amendment) | ClearSign Technologies Corp | 0001104659-24-077829 ↗ |
| 2024-07-12 | EFFECT | EFFECT (declared effective) | ClearSign Technologies Corp | 9999999995-24-002149 ↗ |
| 2024-07-15 | 424B4 | 424B4 (final prospectus) | ClearSign Technologies Corp | 0001104659-24-079684 ↗ |
| 2025-07-28 | EFFECT | EFFECT (declared effective) | ClearSign Technologies Corp | 9999999995-25-002374 ↗ |
| 2025-08-12 | S-1 | S-1 (registration) | ClearSign Technologies Corp | 0001104659-25-076944 ↗ |
| 2025-08-20 | S-1/A | S-1/A (amendment) | ClearSign Technologies Corp | 0001104659-25-080929 ↗ |
| 2025-08-21 | EFFECT | EFFECT (declared effective) | ClearSign Technologies Corp | 9999999995-25-002705 ↗ |
| 2025-08-22 | 424B4 | 424B4 (final prospectus) | ClearSign Technologies Corp | 0001104659-25-081941 ↗ |
Officers, directors and large holders Forms 3, 4 and 5
| Insider | Role | Title | Filings | Years | On this site |
|---|---|---|---|---|---|
| BD & DBG LIVING TRUST | Director; Other; TenPercentOwner | 16 | 2012–2016 | ||
| BELL LON E | Director | 28 | 2012–2020 | ||
| COLANNINO JOSEPH | Officer | Chief Technology Officer; CHIEF TECHNOLOGY OFFICER; See Remarks; Senior VP of Engineering | 13 | 2012–2017 | |
| GOODSON DAVID B | Director; Director,Officer | CHIEF SCIENCE OFFICER | 2 | 2012–2016 | |
| HARMON JAMES N | Officer | CFO and Secretary; Chief Financial Officer; CHIEF FINANCIAL OFFICER; Former Chief Financial Officer; See Remarks | 17 | 2012–2017 | |
| ISAACSON SCOTT P | Director | 20 | 2012–2019 | ||
| LEE ANDREW U | Officer | See Remarks; Sr VP - Business Development; Sr VP of Business Development; SVP, Business Development; SVP of Business Development | 13 | 2012–2017 | |
| OSLER GEOFFREY D | Officer | Chief Marketing Officer; Former Chief Marketing Officer | 9 | 2012–2015 | |
| PIRNAT STEPHEN E | Director; Director,Officer | Chief Executive Officer; President and CEO; President & CEO | 15 | 2012–2018 | |
| RUTKOWSKI RICHARD F | Director,Officer; Director,Officer,TenPercentOwner; Officer | CEO and President; Chief Executive Officer; Former Chief Executive Officer | 5 | 2012–2015 | |
| MARLETT CHRISTOPHER A | Other; TenPercentOwner | 4 | 2012 | ||
| Ruiz Roberto | Officer | Chief Operating Officer; Senior VP-Product Development; Sr VP - Product Development; SVP, Product Development; SVP-Product Development | 12 | 2012–2018 | |
| Ott Jeffrey L | Director | 13 | 2015–2018 | ||
| Kendrick Donald W | Officer | Chief Technology Officer; See Remarks; Senior VP of Technology | 12 | 2016–2020 | |
| Fike Brian Grant | Officer | Chief Financial Officer; Interim CFO; See Remarks | 8 | 2017–2021 | |
| Meline Susanne | Director | 21 | 2018–2023 | ||
| clirSPV LLC | TenPercentOwner | 4 | 2018–2024 | ||
| HOFFMAN Robert Thurston Sr | Director; Director,TenPercentOwner; TenPercentOwner | 25 | 2018–2024 | ||
| GPclirSPV LLC | TenPercentOwner | 4 | 2018–2024 | ||
| Princeton Opportunity Management LLC | TenPercentOwner | 4 | 2018–2024 | ||
| Sock Stephen Michael | Officer | SVP Business Development; SVP, Business Development | 3 | 2018–2020 | |
| SIMMONS JAMES M | Director | 4 | 2019 | ||
| Deller Colin James | Director,Officer; Officer | Chief Executive Officer; President | 9 | 2019–2026 | |
| Pate Bruce Alan | Director | 17 | 2019–2022 | ||
| Schrecker Judith S | Director | 19 | 2021–2025 | ||
| Hinds Brent | Officer | Chief Financial Officer; VP and Controller | 15 | 2021–2026 | |
| DiElsi Gary J. | Director | 7 | 2022–2023 | ||
| de Lacy Catharine | Director | 12 | 2023–2025 | ||
| Maley David M | Director | 7 | 2024–2025 | ||
| Silva Gil Todd | Director | 11 | 2024–2026 | ||
| PASQUESI JOHN M | TenPercentOwner | 2 | 2025–2026 | ||
| Basenese Lou | Director | 6 | 2025–2026 | ||
| DIGIANDOMENICO ANTHONY | Director | 3 | 2025–2026 | ||
| Saddler Larry Michael | Director | 1 | 2026 |
Everyone who filed an insider report for this company, from the SEC’s Insider Transactions Data Sets (2006 on). Person pages are matched by name and state only.
Private offerings before or after (Form D)
| First filed | Issuer | Industry | Offering | Sold | Investors | Filings |
|---|---|---|---|---|---|---|
| 2026-07-31 | ClearSign Technologies Corp | Other Technology | $1,770,000 | $1,770,000 | 1 | 1 |
| 2024-07-09 | ClearSign Technologies Corp | Other Technology | $11,732,579 | $4,341,025 | 1 | 1 |
| 2024-05-08 | ClearSign Technologies Corp | Other Technology | $14,425,891 | $4,999,684 | 1 | 1 |
| 2020-10-02 | ClearSign Technologies Corp | Other | $1,308,850 | $1,308,850 | 1 | 1 |
| 2018-07-23 | CLEARSIGN COMBUSTION CORP | Other Technology | $11,730,472 | $11,730,472 | 1 | 1 |
Data: SEC EDGAR. The quarterly full index (every S-1, S-1/A, F-1 and F-1/A since 1993, with the pricing prospectus, notice of effectiveness and withdrawal request of each registrant) and the company submissions data (SIC, state of incorporation, address, EIN, tickers, former names). Company details are what EDGAR holds today, not at the time of the filing.