Filing Flows › Biolargo (BLGO) › Q4 2025
Biolargo (BLGO) Q4 2025 earnings results (fourth quarter 2025)
10-K filed Mar 4, 2026
Biolargo (BLGO) reported revenue of $617K for the fourth quarter 2025 (Q4 2025), -83% from a year earlier and -44% from the quarter before. Operating margin was -650.1%, net loss $4.1M (671.3% of revenue).
Biolargo, Q4 2025: revenue $617K (-83% year over year), operating margin -650.1%, net loss $4.1M, operating cash flow −$1.6M. The chart follows the revenue to costs, profit and cash.
| Q4 2025 | Amount | Q/Q | Y/Y |
|---|---|---|---|
| Revenue | $617K | -44% | -83% |
| Operating profit | −$4.0M | — | — |
| Net earnings | −$4.1M | — | — |
| Operating cash flow | −$1.6M | — | — |
What changed
Revenue was $617K in Q4 2025, down 83% year over year and down 44% from the previous quarter. Service was the largest line at 70% of revenue.
Gross margin was 20.7%, down 27.1 points from Q4 2024. Operating costs exceeded revenue by $4.0M, an operating margin of -650.1%. Operating expenses grew 23% against a revenue fall of 83%. The fastest-growing cost line was SG&A (+33%). The quarter ended with a net loss of $4.1M, narrower than the previous quarter's $7.2M loss. Minority interests bore $1.2M of it: to shareholders the quarter was a loss of $3.0M.
Operating cash flow was −$1.6M. Non-cash charges added back $33K of depreciation and $1.0M of share-based compensation. Working capital and other items added $1.5M.
Questions
What was Biolargo's revenue in the fourth quarter 2025?
Biolargo (BLGO) reported revenue of $617K for the fourth quarter 2025 (Q4 2025), -83% from a year earlier and -44% from the quarter before.
Was Biolargo profitable in the fourth quarter 2025?
Operating loss was $4.0M (-650.1% of revenue) and net loss $4.1M.
Source: Biolargo 10-K on SEC EDGAR.