Prothena Corporation plc (PRTA) Stock Price History
Historical prices from 2012 to 2026
- 1M
- -1.6%
- 3M
- -8.0%
- YTD
- -14.2%
- 1Y
- -21.7%
- 3Y
- -39.6%
- 5Y
- -33.0%
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
- -3.9%
PRTA Stock Price Trajectory (2012–2026)
As of November 6, 2026, Prothena Corporation plc (PRTA) trades at $7.89, representing a -21.7% return over the past year. The stock has delivered a -86.5% total return over five years (-33.0% 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 -90.1%, currently trading 14% below its 200-day moving average, suggesting potential weakness.
When compared to Healthcare sector peers FOLD (+62.8% 1Y), RARE (-49.7% 1Y), and IONS (-47.6% 1Y), PRTA has underperformed the peer group average. Compare PRTA vs FOLD →
PRTA Historical Price Data · from 2012
Rows 1–50 of 3,489| Date | Open | High | Low | Close | Volume | Change % |
|---|---|---|---|---|---|---|
| 2026-11-05 | 8.27 | 8.38 | 7.87 | 7.89 | 518K | -5.96% |
| 2026-11-04 | 8.48 | 8.56 | 8.30 | 8.39 | 289K | +2.19% |
| 2026-11-03 | 8.30 | 8.49 | 8.15 | 8.21 | 289K | -0.97% |
| 2026-11-02 | 8.45 | 8.49 | 8.11 | 8.29 | 463K | -2.13% |
| 2026-10-30 | 8.79 | 8.90 | 8.35 | 8.47 | 452K | -4.62% |
| 2026-10-29 | 9.10 | 9.26 | 8.75 | 8.88 | 370K | -2.42% |
| 2026-10-28 | 8.64 | 9.22 | 8.61 | 9.10 | 752K | +3.29% |
| 2026-10-27 | 8.40 | 8.85 | 8.35 | 8.81 | 654K | +4.88% |
| 2026-10-26 | 8.34 | 8.49 | 8.21 | 8.40 | 595K | +2.44% |
| 2026-10-23 | 8.18 | 8.27 | 7.93 | 8.20 | 386K | -0.61% |
| 2026-10-22 | 8.01 | 8.29 | 7.96 | 8.25 | 382K | +2.74% |
| 2026-10-21 | 8.47 | 8.54 | 8.01 | 8.03 | 461K | -5.53% |
| 2026-10-20 | 8.55 | 8.65 | 8.45 | 8.50 | 529K | +0.24% |
| 2026-10-19 | 8.39 | 8.57 | 8.31 | 8.48 | 361K | +1.56% |
| 2026-10-16 | 8.58 | 8.62 | 8.24 | 8.35 | 670K | -1.76% |
| 2026-10-15 | 8.54 | 8.65 | 8.44 | 8.50 | 358K | +1.55% |
| 2026-10-14 | 8.28 | 8.56 | 8.19 | 8.37 | 620K | +0.12% |
| 2026-10-13 | 8.45 | 8.55 | 8.20 | 8.36 | 573K | -0.83% |
| 2026-10-12 | 8.81 | 8.81 | 8.40 | 8.43 | 490K | -4.64% |
| 2026-10-09 | 8.57 | 9.31 | 8.50 | 8.84 | 932K | +2.67% |
| 2026-10-08 | 8.43 | 8.81 | 8.36 | 8.61 | 642K | +1.53% |
| 2026-10-07 | 7.93 | 8.63 | 7.88 | 8.48 | 690K | +5.74% |
| 2026-10-06 | 8.28 | 8.28 | 7.80 | 8.02 | 511K | -3.02% |
| 2026-10-05 | 8.34 | 8.37 | 7.91 | 8.27 | 715K | -1.08% |
| 2026-10-02 | 8.62 | 8.62 | 8.35 | 8.36 | 676K | -2.11% |
| 2026-10-01 | 8.54 | 8.58 | 8.35 | 8.54 | 457K | +1.91% |
| 2026-09-30 | 8.98 | 8.99 | 8.37 | 8.38 | 635K | -4.56% |
| 2026-09-29 | 8.66 | 8.80 | 8.59 | 8.78 | 603K | +0.69% |
| 2026-09-28 | 8.25 | 8.86 | 8.07 | 8.72 | 489K | +5.19% |
| 2026-09-25 | 8.38 | 8.52 | 8.19 | 8.29 | 481K | -0.36% |
| 2026-09-24 | 8.63 | 8.73 | 8.28 | 8.32 | 426K | -4.15% |
| 2026-09-23 | 8.94 | 8.97 | 8.66 | 8.68 | 358K | -3.45% |
| 2026-09-22 | 8.72 | 9.09 | 8.70 | 8.99 | 446K | +5.64% |
| 2026-09-21 | 8.59 | 8.80 | 8.46 | 8.51 | 363K | -0.82% |
| 2026-09-18 | 8.41 | 8.60 | 8.25 | 8.58 | 1.83M | +1.42% |
| 2026-09-17 | 8.39 | 8.56 | 8.23 | 8.46 | 405K | +2.67% |
| 2026-09-16 | 8.35 | 8.50 | 8.20 | 8.24 | 398K | -1.08% |
| 2026-09-15 | 8.86 | 8.86 | 8.30 | 8.33 | 323K | -5.98% |
| 2026-09-14 | 8.95 | 8.99 | 8.79 | 8.86 | 375K | -0.78% |
| 2026-09-11 | 9.06 | 9.14 | 8.77 | 8.93 | 376K | -1.00% |
| 2026-09-10 | 9.25 | 9.26 | 8.97 | 9.02 | 311K | -3.01% |
| 2026-09-09 | 9.40 | 9.50 | 9.22 | 9.30 | 295K | -2.52% |
| 2026-09-08 | 9.60 | 9.67 | 9.35 | 9.54 | 305K | -2.85% |
| 2026-09-04 | 9.50 | 9.87 | 9.48 | 9.82 | 384K | +2.29% |
| 2026-09-03 | 9.77 | 9.78 | 9.51 | 9.60 | 277K | -0.93% |
| 2026-09-02 | 9.64 | 9.75 | 9.37 | 9.69 | 341K | +0.83% |
| 2026-09-01 | 9.28 | 9.63 | 9.26 | 9.61 | 268K | +2.78% |
| 2026-08-31 | 9.26 | 9.40 | 9.10 | 9.35 | 335K | +0.21% |
| 2026-08-28 | 9.02 | 9.48 | 8.95 | 9.33 | 498K | +2.64% |
| 2026-08-27 | 9.16 | 9.24 | 8.95 | 9.09 | 339K | -1.73% |
PRTA Chart Terminal
Live VCP patterns, Cup & Handle overlays, support/resistance, and AI trade plans.
Live Breakouts Feed
High-probability breakout stocks crossing their pivot across 5 pattern engines.
Intrinsic Valuation
DCF models, multiple analysis, and analyst estimates.
Historical Returns
10-year return with dividends reinvested.
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 declined -21.7% over the past year, below its 5-year annualized CAGR of -33.0%. The stock trades below its 200-day moving average, reflecting the downtrend.
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 -21.7% places the stock further from 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.