CLEARSIGN COMBUSTION CORP

Q: Jun 30 2026

Q: Mar 31 2026

FY: Dec 31 2025

Q: Sep 30 2025

Q: Jun 30 2025

FY: Dec 31 2024

Q: Mar 31 2025

FY: Dec 31 2024

Q: Sep 30 2024

FY: Dec 31 2023

Q: Jun 30 2024

Q: Mar 31 2024

FY: Dec 31 2023

FY: Dec 31 2023

Q: Sep 30 2023

Q: Jun 30 2023

Q: Mar 31 2023

FY: Dec 31 2022

Q: Sep 30 2022

Q: Jun 30 2022

Regulation FD Disclosure

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Entry into a Material Definitive Agreement

Other Events

Other Events

Submission of Matters to a Vote of Security Holders

Entry into a Material Definitive Agreement

Other Events

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Other Events

Material Modifications to Rights of Security Holders

Submission of Matters to a Vote of Security Holders

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Regulation FD Disclosure

Results of Operations and Financial Condition

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

Rule 506(b) provides a "safer harbor" for a private offering

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement with Pricing Information

Notice of Effectiveness

Amended Initial Registration Statement

Registration (IPO) statement under Securities Act of 1933

Notice of Effectiveness

Registration statement under Securities Act of 1933

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement with Pricing Information

Notice of Effectiveness

06b

Amended Initial Registration Statement

Registration (IPO) statement under Securities Act of 1933

06b

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Preliminary Proxy Statement

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

No description available

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Preliminary Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

DIGIANDOMENICO ANTHONY

Silva Gil Todd

Saddler Larry Michael

Basenese Lou

Saddler Larry Michael

PASQUESI JOHN M

PASQUESI JOHN M

Basenese Lou

DIGIANDOMENICO ANTHONY

Silva Gil Todd

Silva Gil Todd

Deller Colin James

Basenese Lou

Silva Gil Todd

DIGIANDOMENICO ANTHONY

Silva Gil Todd

Deller Colin James

Hinds Brent

Hinds Brent

Hinds Brent

Annual Report Scanned (Paper)

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Annual Report Scanned (Paper)

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Annual Report Scanned (Paper)

Annual Report Scanned (Paper)

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Letter from the SEC