ClearSign designs, develops and markets technologies that aim to improve the key performance characteristics of combustion systems, including emission, operational performance, energy efficiency and overall cost effectiveness.
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| Form | Description | Date | Format |
|---|---|---|---|
| EFFECT | Notice from the SEC of registration effectiveness | Jul 12, 2019 |    |
| SC 13D/A | Amendment to a SC 13D filing | Jul 8, 2019 |  |
| 25-NSE | Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities | Jan 25, 2019 | |
| SC 13D | Filing by person(s) reporting owned shares of common stock in a public company >5% | Jan 18, 2019 | |