Prothena Corporation plc
PRTA
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Fundamentals
| Market cap | $442.01M | Enterprise value | $160.81M | Trailing P/E | — | Forward P/E | -5.66 |
| PEG | — | Price / book | 1.55 | Beta | -0.29 | Dividend yield | 0.00% |
| Revenue growth | -77.1% | Earnings growth | — | Gross margin | -19.1% | Operating margin | -18.5% |
| Profit margin | -80.7% | ROE | -14.4% | ROA | -10.7% | Debt / equity | 0.02 |
| Current ratio | 25.05 | Free cash flow | -$54.22M | Analyst recommendation | none | Mean target | $21.40 |
| 52w high | $11.80 | 52w low | $7.73 |
Quarterly
| 2026-Q2 | 2026-Q1 | 2025-Q4 | 2025-Q3 | 2025-Q2 | 2025-Q1 | |
|---|---|---|---|---|---|---|
| Revenue | $1.0M | $51.1M | $0.0M | $2.4M | $4.4M | — |
| Op margin | -1850.2% | 50.5% | -129576.2% | -1646.4% | -1176.6% | — |
| Net income | -$18.6M | $32.7M | -$21.6M | -$36.5M | -$126M | — |
| Gross margin | — | — | — | — | — | — |
| Gross profit | — | — | — | — | — | — |
| Operating income | -$18.7M | $25.8M | -$27.2M | -$39.8M | -$52.0M | — |
- Revenue -98% vs prior quarter ($1.0M vs $51M).
- Operating margin compressed to -1850.2%.
Yearly (6y)
| 2025 | 2024 | 2023 | 2022 | 2021 | |
|---|---|---|---|---|---|
| Revenue | $9.7M | $135M | $91.4M | $53.9M | — |
| Op margin | -1905.8% | -114.4% | -209.1% | -244.1% | — |
| Net income | -$244M | -$122M | -$147M | -$117M | — |
| Gross margin | — | — | — | — | — |
| Gross profit | — | — | — | — | — |
| Operating income | -$185M | -$155M | -$191M | -$132M | — |
No flags
• No distress or material-risk keywords in recent headlines (keyword scan only — not a guarantee).
News
2026-10-08 · CRMD vs. PRTA: Which Stock Should Value Investors Buy Now?
2026-10-06 · Prothena Corp Public Ltd Insider Bought Shares Worth $857,240, According to a Recent SEC Filing
2026-09-29 · Prothena Corp Public Ltd Insider Bought Shares Worth $889,872, According to a Recent SEC Filing
2026-09-21 · Prothena Corp Public Ltd Insider Bought Shares Worth $843,460, According to a Recent SEC Filing
2026-09-21 · 4 Alzheimer's Drug Stocks to Watch on World Alzheimer's Day
2026-09-09 · Prothena to Participate in the H.C. Wainwright 28th Annual Global Investment Conference
2026-08-19 · Real Parkinson’s Disease Hope from Jupiter Neurosciences
2026-08-14 · KMDA or PRTA: Which Is the Better Value Stock Right Now?
2026-08-07 · PRTA's Q2 Loss Narrower Than Expected, Pipeline Progress in Focus
2026-08-06 · Prothena (PRTA) Reports Q2 Loss, Misses Revenue Estimates
2026-08-06 · Prothena: Q2 Earnings Snapshot
2026-08-06 · Prothena Reports Second Quarter 2026 Financial Results and Business Highlights
Price (daily)
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