Filing Flows › ClearSign Technologies (CLIR) › Q4 2025
ClearSign Technologies (CLIR) Q4 2025 earnings results (fourth quarter 2025)
10-K filed Mar 31, 2026
ClearSign Technologies (CLIR) reported revenue of $3.7M for the fourth quarter 2025 (Q4 2025), +522% from a year earlier and +257% from the quarter before. Operating margin was -22.5%, net loss $311K (8.5% of revenue).
ClearSign Technologies, Q4 2025: revenue $3.7M (+522% year over year), operating margin -22.5%, net loss $311K, operating cash flow −$1.3M. The chart follows the revenue to costs, profit and cash.
| Q4 2025 | Amount | Q/Q | Y/Y |
|---|---|---|---|
| Revenue | $3.7M | +257% | +522% |
| Operating profit | −$826K | — | — |
| Net earnings | −$311K | — | — |
| Operating cash flow | −$1.3M | — | — |
What changed
Revenue was $3.7M in Q4 2025, up 522% year over year and up 257% from the previous quarter.
Gross margin was 21.9%, up 7.0 points from Q4 2024. Operating costs exceeded revenue by $826K, an operating margin of -22.5%. Operating expenses fell 7% while revenue rose 522%. The quarter ended with a net loss of $311K, narrower than the previous quarter's $1.4M loss. Non-operating items added $515K, -166% of pre-tax earnings, so the bottom line overstates operating performance.
Operating cash flow was −$1.3M. Non-cash charges added back $44K of depreciation and amortization and $30K of share-based compensation. Working capital and other items used $1.0M.
Questions
What was ClearSign Technologies' revenue in the fourth quarter 2025?
ClearSign Technologies (CLIR) reported revenue of $3.7M for the fourth quarter 2025 (Q4 2025), +522% from a year earlier and +257% from the quarter before.
Was ClearSign Technologies profitable in the fourth quarter 2025?
Operating loss was $826K (-22.5% of revenue) and net loss $311K.