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Hosting Call at 5pm ET on Thursday, April 9th TULSA, OK / ACCESS Newswire / March 26, 2026 / ClearSign Technologies Corporation (Nasdaq:CLIR) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydrogen, announces that on Thursday, April 9, 2026, the Company will host a conference call at 5:00 PM ET. The Company will file its annual report on form 10-K with the SEC in the coming days and will issue a summary of its financial and operating results for the year and quarter ending on December 31, 2025, in a press release on the day of the call.

Partnered with National Energy Technology Laboratory to Advance Flexible Fuel, Ultra-Low NOx Combustion for Industrial Operations TULSA, OK / ACCESS Newswire / March 11, 2026 / ClearSign Technologies Corporation (Nasdaq:CLIR) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydrogen, announces today that, in conjunction with the U.S. Department of Energy's ("DOE") National Energy Technology Laboratory ("NETL"), under its Small Business Innovation Research ("SBIR") program, it has successfully completed the testing of its ClearSign Core™ Flexible Fuel, 100% Hydrogen Capable process burner branded as ClearSign Core™ 2. "We are very pleased to publicly report the success of this flexible fuel burner development project," said Jim Deller, Ph.D.

TULSA, OKLAHOMA / ACCESS Newswire / March 10, 2026 / ClearSign Technologies Corporation (NASDAQ:CLIR) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydrogen, today announced a 1-for-10 reverse stock split of its outstanding common stock. The reverse stock split will become effective at 12:01 a.m.

ClearSign Technologies Corporation (CLIR) Q4 2025 Earnings Call Transcript

Hosting Call at 5pm ET on Tuesday, February 24th TULSA, OKLAHOMA / ACCESS Newswire / February 18, 2026 / ClearSign Technologies Corporation (Nasdaq:CLIR) ("ClearSign" or the "Company") a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydrogen, announces that on Tuesday, February 24th, 2026, at 5:00 PM ET, the Company will host a conference call to provide a business update. Investors interested in participating on the call can dial 888-506-0062 within the U.S. or 973-528-0011 from abroad, and reference Participant Access Code: 561367.

Order Entails Full System Retrofit TULSA, OKLAHOMA / ACCESS Newswire / February 17, 2026 / ClearSign Technologies Corporation (Nasdaq:CLIR) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydrogen, today announces it received an engineering order for a fifth low-emission retrofit flare burner and the other components of the enclosed system from an energy company for deployment in California. "We're pleased to continue to supply this key customer with advanced flaring solutions to modernize their fleet and operate within California's clean air standards," said Jim Deller, Ph.D.

Fourth Quarter Revenues up Approximately 510% Year-over-Year Full Year Revenues up Approximately 44% Year-over-Year TULSA, OK / ACCESS Newswire / January 7, 2026 / ClearSign Technologies Corporation (NASDAQ:CLIR) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydrogen, today provides selected preliminary, unaudited financial results for its fourth quarter and year ended December 31, 2025. Revenues for the fourth quarter are expected to be approximately $3.6 million compared to $590 thousand for the same period in 2024, reflecting a year-over-year revenue growth of approximately 510%, and revenues for the fiscal year ended December 31, 2025 are expected to be approximately $5.2 million compared to $3.6 million for the same period in 2024, reflecting a year-over-year revenue growth of approximately 44%.