ClearSign Technologies Corporation reported a significant increase in revenue for the fiscal year ending December 31, 2025, with total revenues reaching $5.2 million, a 45.6% increase from $3.6 million in 2024. The company attributed this growth primarily to increased orders for its process burners, midstream burners, flares, and engineering services. Despite the revenue growth, ClearSign continued to experience a net loss of $5.5 million, slightly higher than the $5.3 million loss reported in the previous year. The basic and diluted net loss per share improved to $0.99 from $1.08, reflecting a reduction in the loss per share.
In terms of operational changes, ClearSign's customer base has shifted, with two California refinery customers accounting for 15% and 86% of total revenue in 2025 and 2024, respectively. The company also noted a significant increase in its warranty accruals, which impacted gross profit margins. Operating expenses rose to $8.1 million, up 6.5% from the previous year, driven by increased legal fees and non-cash expenses related to stock options and restricted stock units.
Strategically, ClearSign has focused on expanding its product offerings and market reach. The company has developed its ClearSign Eye flame sensor technology, which is designed for both combustion and transportation markets. Additionally, ClearSign has entered into collaborative agreements with major industry players, including Zeeco, to enhance its manufacturing capabilities and market presence. The company is also pursuing opportunities in hydrogen burner technology, supported by grants from the Department of Energy.
Looking ahead, ClearSign anticipates continued operating losses and negative cash flows as it invests in research and development to commercialize its technologies. The company has raised approximately $105.3 million through equity securities to date and may seek additional funding to support its operations. ClearSign's management remains optimistic about the long-term potential of its technologies, particularly in light of increasing regulatory pressures for emissions reductions in the combustion industry. However, the company acknowledges the challenges of achieving market acceptance and the need for ongoing financial support to sustain its growth trajectory.
About ClearSign Technologies Corp
ClearSign Technologies develops innovative combustion and emissions control technologies, primarily through its patented ClearSign Core system. Its solutions improve energy efficiency, reduce harmful NOx emissions, and facilitate compliance with stringent environmental regulations across the energy, refining, petrochemical, and industrial sectors. The company collaborates with OEMs and service providers to commercialize standardized burner products, targeting markets driven by environmental standards and decarbonization efforts.
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