Filing Flows › Prothena Corp Public (PRTA) › Q4 2025
Prothena Corp Public (PRTA) Q4 2025 earnings results (fourth quarter 2025)
10-K filed Feb 27, 2026
Prothena Corp Public (PRTA) reported revenue of $21K for the fourth quarter 2025 (Q4 2025), -99% from a year earlier and -99% from the quarter before.
Prothena Corp Public, Q4 2025: revenue $21K (-99% year over year), net loss $21.6M, operating cash flow −$23.3M. The chart follows the revenue to costs, profit and cash.
| Q4 2025 | Amount | Q/Q | Y/Y |
|---|---|---|---|
| Revenue | $21K | -99% | -99% |
| Operating profit | −$24.2M | — | — |
| Net earnings | −$21.6M | — | — |
| Operating cash flow | −$23.3M | — | — |
What changed
Revenue was $21K in Q4 2025, down 99% year over year and down 99% from the previous quarter.
Operating costs exceeded revenue by $24.2M, an operating margin of -115252.4%. Total costs fell 64% while revenue fell 99%. The quarter ended with a net loss of $21.6M, narrower than the previous quarter's $36.5M loss.
Operating cash flow was −$23.3M. Non-cash charges added back $218K of depreciation and amortization and $7.1M of share-based compensation. Working capital and other items used $9.0M.
Questions
What was Prothena Corp Public's revenue in the fourth quarter 2025?
Prothena Corp Public (PRTA) reported revenue of $21K for the fourth quarter 2025 (Q4 2025), -99% from a year earlier and -99% from the quarter before.