Prothena Corporation plc (PRTA) Stock Price History
Historical prices from 2012 to 2026
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PRTA Historical Performance
Short-Term Returns
PRTA Stock Price Trajectory (2012–2026)
As of May 8, 2026, Prothena Corporation plc (PRTA) trades at $10.53, representing a +44.4% return over the past year. The stock has delivered a -57.2% total return over five years (-15.6% CAGR), reflecting challenging market conditions.
The stock reached its all-time high of $79.75 on September 27, 2021. From this peak, PRTA has corrected -86.8%, currently trading 12% above its 200-day moving average, indicating continued institutional support.
When compared to Healthcare sector peers FOLD (+137.9% 1Y), RARE (-21.8% 1Y), and IONS (+129.9% 1Y), PRTA has underperformed the peer group average. Compare PRTA vs FOLD →
PRTA Historical Price Data (2025–2026)
Showing 30 of 3,364 recordsLoading full history…
| Date | Open | High | Low | Close | Volume | Change % |
|---|---|---|---|---|---|---|
| 2026-05-07 | 11.18 | 11.21 | 10.48 | 10.53 | 437K | -5.81% |
| 2026-05-06 | 11.19 | 11.29 | 11.02 | 11.18 | 321K | -0.09% |
| 2026-05-05 | 11.08 | 11.25 | 10.89 | 11.19 | 302K | +3.71% |
| 2026-05-04 | 10.58 | 11.00 | 10.55 | 10.79 | 585K | +1.41% |
| 2026-05-01 | 11.04 | 11.13 | 10.64 | 10.64 | 506K | -3.80% |
| 2026-04-30 | 11.06 | 11.12 | 10.84 | 11.06 | 233K | +1.75% |
| 2026-04-29 | 11.46 | 11.46 | 10.74 | 10.87 | 389K | -5.56% |
| 2026-04-28 | 10.84 | 11.56 | 10.84 | 11.51 | 434K | +6.67% |
| 2026-04-27 | 10.97 | 11.12 | 10.71 | 10.79 | 301K | +0.37% |
| 2026-04-24 | 10.65 | 10.82 | 10.40 | 10.75 | 265K | +0.19% |
| 2026-04-23 | 10.70 | 11.07 | 10.60 | 10.73 | 458K | +0.09% |
| 2026-04-22 | 10.69 | 10.85 | 10.62 | 10.72 | 341K | +0.47% |
| 2026-04-21 | 10.78 | 10.78 | 10.48 | 10.67 | 439K | -1.11% |
| 2026-04-20 | 10.86 | 10.97 | 10.78 | 10.79 | 311K | -0.78% |
| 2026-04-17 | 10.71 | 10.98 | 10.70 | 10.88 | 455K | +3.37% |
| 2026-04-16 | 10.78 | 10.85 | 10.45 | 10.52 | 279K | -2.77% |
| 2026-04-15 | 10.68 | 10.87 | 10.55 | 10.82 | 369K | +1.98% |
| 2026-04-14 | 10.51 | 10.67 | 10.34 | 10.61 | 361K | +2.91% |
| 2026-04-13 | 10.42 | 10.55 | 10.18 | 10.31 | 307K | -1.81% |
| 2026-04-10 | 10.60 | 10.60 | 10.37 | 10.50 | 308K | -0.76% |
| 2026-04-09 | 10.47 | 10.70 | 10.38 | 10.58 | 402K | -0.66% |
| 2026-04-08 | 10.56 | 10.68 | 10.29 | 10.65 | 437K | +2.80% |
| 2026-04-07 | 9.98 | 10.37 | 9.80 | 10.36 | 457K | +3.19% |
| 2026-04-06 | 9.88 | 10.11 | 9.88 | 10.04 | 389K | +1.83% |
| 2026-04-02 | 9.82 | 10.08 | 9.52 | 9.86 | 845K | -1.69% |
| 2026-04-01 | 9.84 | 10.12 | 9.80 | 10.03 | 574K | +3.19% |
| 2026-03-31 | 9.33 | 9.86 | 9.33 | 9.72 | 645K | +5.08% |
| 2026-03-30 | 9.15 | 9.50 | 9.11 | 9.25 | 406K | -0.11% |
| 2026-03-27 | 9.42 | 9.62 | 9.15 | 9.26 | 413K | -2.73% |
| 2026-03-26 | 9.19 | 9.68 | 9.16 | 9.52 | 447K | +2.26% |
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Start ComparisonPRTA — Frequently Asked Questions
Quick answers to the most common questions about buying PRTA stock.
How has PRTA stock performed recently?
PRTA returned +44.4% over the past year, beating its 5-year annualized CAGR of -15.6%. The stock trades above its 200-day moving average, confirming the uptrend.
What is PRTA's all-time high price?
Prothena Corporation plc reached $79.75 on 2021-09-27. The 52-week high is $11.69. Current 1-year return of +44.4% places the stock closer to historical peaks.
Where can I download PRTA historical price data?
This page provides PRTA daily OHLCV data with 50-day MA, 200-day MA, and RSI indicators. Data spans 2012-2026, downloadable in CSV format.