Prothena Corporation plc (PRTA) Stock Price History
Historical prices from 2012 to 2026
- 1M
- +13.1%
- 3M
- -6.6%
- YTD
- +5.2%
- 1Y
- +53.9%
- 3Y
- -46.9%
- 5Y
- -28.9%
Loading 10-year price history...
PRTA Historical Performance
PRTA Annual Returns
Year-by-year price performance · 2012–2026
- 2012 annual price return
- +1.8%
- 2013 annual price return
- +278.9%
- 2014 annual price return
- -26.1%
- 2015 annual price return
- +234.7%
- 2016 annual price return
- -20.9%
- 2017 annual price return
- -24.7%
- 2018 annual price return
- -72.8%
- 2019 annual price return
- +50.8%
- 2020 annual price return
- -23.2%
- 2021 annual price return
- +301.6%
- 2022 annual price return
- +22.4%
- 2023 annual price return
- -32.1%
- 2024 annual price return
- -64.1%
- 2025 annual price return
- -30.1%
- 2026 annual price return
- -5.8%
PRTA Stock Price Trajectory (2012–2026)
As of July 8, 2026, Prothena Corporation plc (PRTA) trades at $9.68, representing a +53.9% return over the past year. The stock has delivered a -81.8% total return over five years (-28.9% 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 -87.9%, currently trading -0% above its 200-day moving average, indicating continued institutional support.
When compared to Healthcare sector peers FOLD (+139.5% 1Y), RARE (-9.4% 1Y), and IONS (+106.6% 1Y), PRTA has underperformed the peer group average. Compare PRTA vs FOLD →
PRTA Historical Price Data · from 2012
Rows 1–50 of 3,404| Date | Open | High | Low | Close | Volume | Change % |
|---|---|---|---|---|---|---|
| 2026-07-07 | 9.62 | 9.78 | 9.33 | 9.68 | 508K | +1.89% |
| 2026-07-06 | 9.66 | 9.84 | 9.47 | 9.50 | 398K | -1.96% |
| 2026-07-02 | 9.58 | 10.16 | 9.57 | 9.69 | 433K | +1.15% |
| 2026-07-01 | 9.74 | 10.00 | 9.47 | 9.58 | 434K | -2.15% |
| 2026-06-30 | 9.96 | 10.01 | 9.75 | 9.79 | 327K | -1.81% |
| 2026-06-29 | 10.05 | 10.11 | 9.78 | 9.97 | 407K | -0.50% |
| 2026-06-26 | 9.32 | 10.09 | 9.32 | 10.02 | 0 | +8.09% |
| 2026-06-25 | 9.42 | 9.58 | 9.19 | 9.27 | 938K | -1.38% |
| 2026-06-24 | 9.57 | 9.87 | 9.26 | 9.40 | 449K | -1.57% |
| 2026-06-23 | 9.40 | 9.77 | 9.12 | 9.55 | 455K | +4.37% |
| 2026-06-22 | 8.93 | 9.27 | 8.89 | 9.15 | 596K | +2.46% |
| 2026-06-18 | 8.63 | 9.15 | 8.52 | 8.93 | 1.13M | +5.18% |
| 2026-06-17 | 8.39 | 8.72 | 8.39 | 8.49 | 537K | +2.41% |
| 2026-06-16 | 8.16 | 8.35 | 7.85 | 8.29 | 582K | +1.72% |
| 2026-06-15 | 8.74 | 8.77 | 7.93 | 8.15 | 611K | -1.21% |
| 2026-06-12 | 8.26 | 8.45 | 8.22 | 8.25 | 294K | -0.12% |
| 2026-06-11 | 7.89 | 8.46 | 7.73 | 8.26 | 634K | +4.42% |
| 2026-06-10 | 8.68 | 8.68 | 7.90 | 7.91 | 451K | -6.61% |
| 2026-06-09 | 8.56 | 8.87 | 8.35 | 8.47 | 481K | -1.05% |
| 2026-06-08 | 8.80 | 8.89 | 8.53 | 8.56 | 308K | -2.62% |
| 2026-06-05 | 9.32 | 9.38 | 8.63 | 8.79 | 649K | -4.97% |
| 2026-06-04 | 9.03 | 9.45 | 9.03 | 9.25 | 500K | +3.70% |
| 2026-06-03 | 9.21 | 9.21 | 8.73 | 8.92 | 578K | -2.94% |
| 2026-06-02 | 9.59 | 9.59 | 9.12 | 9.19 | 353K | -4.17% |
| 2026-06-01 | 9.90 | 9.96 | 9.49 | 9.59 | 368K | -5.80% |
| 2026-05-29 | 9.89 | 10.23 | 9.80 | 10.18 | 472K | +2.00% |
| 2026-05-28 | 9.95 | 10.05 | 9.93 | 9.98 | 276K | -0.50% |
| 2026-05-27 | 10.11 | 10.26 | 10.01 | 10.03 | 609K | -0.30% |
| 2026-05-26 | 9.84 | 10.07 | 9.45 | 10.06 | 903K | +2.34% |
| 2026-05-22 | 9.36 | 10.00 | 9.36 | 9.83 | 0 | +4.46% |
| 2026-05-21 | 9.16 | 9.42 | 9.04 | 9.41 | 381K | +0.64% |
| 2026-05-20 | 9.09 | 9.41 | 9.09 | 9.35 | 603K | +3.09% |
| 2026-05-19 | 9.61 | 9.84 | 9.02 | 9.07 | 605K | -5.42% |
| 2026-05-18 | 9.66 | 10.09 | 9.53 | 9.59 | 640K | -1.74% |
| 2026-05-15 | 9.73 | 9.81 | 9.46 | 9.76 | 691K | -1.01% |
| 2026-05-14 | 9.60 | 9.87 | 9.42 | 9.86 | 447K | +2.71% |
| 2026-05-13 | 9.33 | 9.73 | 9.28 | 9.60 | 448K | +1.80% |
| 2026-05-12 | 9.67 | 9.82 | 9.29 | 9.43 | 495K | -2.48% |
| 2026-05-11 | 10.82 | 10.88 | 9.46 | 9.67 | 844K | -9.88% |
| 2026-05-08 | 11.00 | 11.80 | 10.64 | 10.73 | 768K | +1.90% |
| 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% |
Intrinsic Valuation
DCF models, multiple analysis, and analyst estimates.
Historical Returns
10-year return with dividends reinvested.
DCA Calculator
See how regular investing compounds over time.
Peer Comparison
Compare growth, multiples, and margins vs sector.
PRTA — Frequently Asked Questions
Quick answers to the most common questions about buying PRTA stock.
How has PRTA stock performed recently?
PRTA returned +53.9% over the past year, beating its 5-year annualized CAGR of -28.9%. The stock trades below 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 $11.80. Current 1-year return of +53.9% 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.