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
ARS Annual report to shareholders Apr 28, 2026 Dec 31, 2025
10-K Annual report Mar 31, 2026 Dec 31, 2025
ARS Annual report to shareholders Jun 13, 2025 Dec 31, 2024
10-K/A Amended annual report May 28, 2025 Dec 31, 2024
10-K Annual report Mar 31, 2025 Dec 31, 2024
10-K/A Amended annual report Nov 7, 2024 Dec 31, 2023
ARS Annual report to shareholders May 10, 2024 Dec 31, 2023
10-K/A Amended annual report Apr 26, 2024 Dec 31, 2023
10-K Annual report Apr 1, 2024 Dec 31, 2023
ARS Annual report to shareholders Apr 26, 2023 Dec 31, 2022
10-K Annual report Mar 31, 2023 Dec 31, 2022
10-K Annual report Mar 31, 2022 Dec 31, 2021
10-K/A Amended annual report Apr 30, 2021 Dec 31, 2020
10-K Annual report Mar 31, 2021 Dec 31, 2020
10-K Annual report Mar 30, 2020 Dec 31, 2019
10-K Annual report Mar 12, 2019 Dec 31, 2018
10-K Annual report Mar 27, 2018 Dec 31, 2017
10-K Annual report Feb 14, 2017 Dec 31, 2016
10-K Annual report Mar 3, 2016 Dec 31, 2015
10-K Annual report Feb 26, 2015 Dec 31, 2014
10-K Annual report Mar 11, 2014 Dec 31, 2013
10-K Annual report Feb 22, 2013 Dec 31, 2012

Showing 22 filings. 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)

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Source: SEC EDGAR filings. This is company-reported data, not investment advice.