ClearSign Technologies Corp (NASDAQ: CLIR)

ClearSign Technologies Corp designs and develops technologies for decarbonization and improving key performance characteristics of combustion systems, including emission and operational performance, energy efficiency, and overall cost effectiveness. The company’s ClearSign Core™ technology has been validated in full scale industrial test furnaces and boilers, with early customer installations now operating in normal commercial service. ClearSign Technologies Corp has generated nominal revenues to date while incurring losses since inception that total $104.2 million. To fund its operations, the firm has relied primarily on equity offerings, having raised approximately $105.3 million in gross proceeds through the sale of its securities as of September 30, 2025. The company maintains a workforce of 16 full time employees and supplements internal expertise with external consultants for specialized development and administrative tasks.

The company generates revenue primarily through the sale of spare parts, flare systems, midstream equipment, burner shipments, engineering services, and computational fluid dynamics (CFD) analysis to industrial customers. In the nine months ended September 30, 2025, revenue totaled $1,563 thousand, driven by spare parts orders, flare orders, midstream orders, and engineering services, while the comparable period in 2024 featured burner shipments to a California refinery, engineering feasibility studies, and additional spare parts deliveries. Revenue is recognized upon delivery of products or completion of services, and the firm also derives income from customer witness tests and related technical support. The firm’s revenue streams are project based and vary with the timing of customer orders and the completion of development milestones.

ClearSign Technologies Corp operates in the market for low emission combustion and energy efficiency solutions, where it seeks to differentiate itself through the proven performance of its ClearSign Core™ technology in reducing pollutants and improving fuel usage. The company competes with other providers of combustion and emissions control technologies, and its success depends on gaining market acceptance and achieving sufficient recurring sales to cover operating costs. Regulatory pressure to lower greenhouse gas emissions and improve industrial efficiency creates demand for technologies that can enhance furnace and boiler performance while reducing fuel consumption. ClearSign Core™ has demonstrated in full scale testing the ability to lower nitrogen oxide emissions and increase thermal efficiency, providing a potential advantage over conventional combustion systems.

The company serves a diverse industrial customer base that includes a California refinery, various processors requiring spare parts and flare equipment, midstream operators, and firms seeking engineering and CFD analysis services. Specific customers referenced in the filing consist of the California refinery that received burner shipments in 2024, while other engagements are described only in generic terms. ClearSign Technologies Corp also works with industrial firms that conduct witness tests to validate technology performance under real world conditions. The firm’s customer relationships are typically tied to individual projects, with repeat business contingent on demonstrated performance and cost benefit outcomes.