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Wednesday 4 November 2026
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Prothena Corporation plc
PRTA Healthcare Biotechnology
Prothena Corporation plc’s revenue for fiscal 2025 (year ended December 2025) was $9.7 million, down 92.8% from fiscal 2024.
- Revenue
- −77.2%
- EPS
- +84.6%
- Free cash flow
- +44.6%
Quarter to June 2026, against a year earlier
8.38
0.17
+2.07%
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Prothena Corporation plc (PRTA) P/E ratio
Prothena Corporation plc has no meaningful P/E ratio: its trailing twelve-month earnings is negative. Over the past ten years it has ranged from 0.0× (November 2026) to 2,974× (September 2022) — the current reading is the lowest in ten years.
P/E ratio, daily
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Annual newest first
| Period | P/E ratio | Change |
|---|---|---|
| FY2025 | 0.0× | — |
| FY2024 | 0.0× | — |
| FY2023 | 0.0× | — |
| FY2022 | 0.0× | — |
| FY2021 | 35.5× | — |
| FY2020 | 0.0× | — |
| FY2019 | 0.0× | — |
| FY2018 | 0.0× | — |
| FY2017 | 0.0× | — |
| FY2016 | 0.0× | — |
Quarterly newest first
| Period | P/E ratio | Change |
|---|---|---|
| Jun 2026 | 0.0× | — |
| Mar 2026 | 0.0× | — |
| Dec 2025 | 0.0× | — |
| Sep 2025 | 0.0× | — |
| 42 more quarters | Free account |
Against its own ten years
Low 0.0×
High 2,974×
Ten-year median
0.0×
Current reading's percentile
92
P/E ratio against peers
| Company | P/E ratio |
|---|---|
| ASMB Assembly Biosciences, Inc. compare | n/m |
| MNPR Monopar Therapeutics Inc. compare | n/m |
| PRTA Prothena Corporation plc | n/m |
| RLMD Relmada Therapeutics, Inc. compare | n/m |
| CAPR Capricor Therapeutics, Inc. compare | n/m |
| PRTCY PureTech Health PLC Sponsored ADR compare | n/m |
| EPRX Eupraxia Pharmaceuticals Inc. compare | n/m |
| CRMD CorMedix Inc compare | 2.3× |
| YDES YD Bio Limited compare | — |
| Biotechnology industry median | 10.6× |
| Healthcare sector median | 24.6× |
| Market median | 18.3× |
What P/E ratio is
Price to Earnings Ratio shows how much investors pay for each dollar of a company’s annual profit per share.
Stock Price ÷ EPS (Basic) (TTM)