ClearSign Technologies Corp: management transactions · United States · SEC (Form 4)

About ClearSign Technologies Corp

ClearSign Technologies Corp. is a U.S.-listed industrial technology company traded on the Nasdaq market (NASDAQ: CLIR), not NYSE. Founded in 2008, the company originally started in Seattle and later relocated its headquarters to Tulsa, Oklahoma in 2022. For French-speaking investors, ClearSign should be viewed as a niche environmental and combustion-technology business focused on emissions reduction, process efficiency, and industrial safety rather than as a broad-based energy OEM. ([clearsign.com](https://clearsign.com/about-clearsign/?utm_source=openai)) ClearSign’s core business is built around proprietary combustion and sensing technologies used in industrial equipment. Its flagship platform, ClearSign Core™, is embedded in burners and combustion systems designed to materially reduce NOx emissions while improving thermal efficiency. The company also markets ClearSign Eye™, an electrical flame-sensing solution intended to strengthen safety and control in industrial burner applications. Its product set includes process burners, boiler burners, flare systems, and sensing configurations, with use cases spanning refining, petrochemicals, industrial boilers, transport, power, and selected hydrogen-related applications. ([clearsign.com](https://clearsign.com/?utm_source=openai)) From a competitive standpoint, ClearSign remains a small-cap company competing against much larger combustion-equipment and controls vendors. Its differentiation comes from intellectual property, performance claims around ultra-low NOx combustion, and the ability to integrate its technologies into established OEM product lines rather than building a full industrial equipment franchise from scratch. That model can be attractive in regulated end markets where customers need retrofit-friendly, emissions-compliant solutions and where the push toward lower-carbon fuels, including hydrogen, creates a potential long-term tailwind. ([clearsign.com](https://clearsign.com/clearsign-reports-successful-sub-5ppm-department-of-energy-small-business-innovation-research-flexible-fuel-burner-testing/?utm_source=openai)) Geographically, the business is still primarily U.S.-centered, with offices in Tulsa and Seattle and commercialization efforts focused mainly on North American industrial customers. Its SEC filings also reference a ClearSign Asia subsidiary, indicating that the company has at least some international organizational reach, although the recent commercial narrative remains heavily tied to the United States. ([clearsign.com](https://clearsign.com/about-clearsign/?utm_source=openai)) Recent developments have been important for the investment case. In April 2026, ClearSign reported record fourth-quarter 2025 revenue of $3.7 million and full-year 2025 revenue of $5.2 million, up 44% year over year, while disclosing cash and cash equivalents of about $9.2 million at year-end 2025. During 2025, the company also highlighted new commercial orders, ongoing product traction in California and refinery-related markets, a co-branded process burner line with Zeeco, and a board refresh aimed at supporting the next stage of growth. ([clearsign.com](https://clearsign.com/clearsign-technologies-corporation-provides-fourth-quarter-and-full-year-2025-update/?utm_source=openai))