ClearSign Technologies Corporation reported record revenue for the fourth quarter of 2025, with $3.7 million in sales—an increase of 510% to 528% from the same period a year earlier. Full‑year 2025 revenue reached $5.2 million, up 44% from $3.6 million in 2024, and the company’s quarterly loss of $0.09 per share beat consensus estimates of $0.30 per share by $0.21.
The earnings beat was driven by a one‑time charge and continued investment in product development, but the company’s strong demand for ultra‑low NOx burners and its new M‑Series line helped offset the loss. Gross profit margin fell to 27% in 2025 from 31% in 2024, largely due to increased warranty accruals. Management noted that the quarter’s performance was strengthened by the completion of a 26‑burner order for a petrochemical plant on the U.S. Gulf Coast, and that testing, engineering, flares and service work contributed to the record revenue.
"We’re pleased to have closed the year on a high note, delivering record results for both the fourth quarter and the full year. We believe that this performance reflects ClearSign’s growing recognition across the industry and increasing traction in our markets," said CEO Jim Deller. "Our fourth quarter performance was strengthened by the completion of a significant 26 burner order for installation at a U.S. Gulf Coast facility operated by a petrochemical company client."
ClearSign had regained compliance with Nasdaq’s minimum bid price requirement on December 9 2024 and again on March 30 2026, so the earnings release does not address a current compliance issue. The company completed a 1‑for‑10 reverse stock split on March 16 2026 to support the bid price and has continued its partnership with Zeeco, which provides manufacturing, sales and marketing support and access to testing facilities.
Investors reacted with volatility: the stock initially surged after the earnings beat but later declined as the EPS miss and margin compression drew attention. The revenue beat was driven by large process‑burner orders, while the EPS miss reflected the impact of the one‑time charge and lower gross margin. Management expressed confidence that momentum will continue, citing a strong proposal pipeline and the launch of hydrogen‑capable burners and advanced flares.
"We expect this momentum to continue, supported by a strong and expanding proposal pipeline. Our highly adaptable, new flexible fuel ClearSign Core‑2 process burner technology, which delivers ultra‑low emissions while…" (continued in the company’s guidance).
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