Prothena Corporation plc (PRTA) Stock Chart
PRTA price chart
Daily prices adjusted for splits and dividends. 1D and 5D show delayed intraday prices. Markers: E earnings, D dividend, S split.
Technical snapshot
Key levels & statistics
PRTA performance vs the market
Total return, dividends reinvestedPRTA monthly returns
PRTA historical prices
PRTA dividends & splits
About the PRTA chart
Prothena (PRTA) closed at $8.35 on October 16, 2026, down 12.6% so far this year. The stock is trading 9.9% below its 200-day moving average of $9.27, which technical analysts usually read as a long-term downtrend. Over the past year PRTA returned −17.2% including dividends, behind the S&P 500 (+16.8%).
This page charts the full trading history of Prothena Corporation plc stock. Daily prices come from EODHD and are adjusted for stock splits and dividends, so returns over long periods are comparable. For the latest quote, company profile, earnings and news, see the PRTA stock overview.
PRTA chart FAQ
What is Prothena's all-time high stock price?
The highest closing price for PRTA was $78.89 on September 23, 2021 (adjusted for stock splits). As of the October 16, 2026 close it traded 89.4% below that level.
What is the 52-week range of PRTA stock?
Over the 52 weeks to October 16, 2026, PRTA traded between an intraday low of $7.73 on June 11, 2026 and an intraday high of $11.80 on May 8, 2026.
Is PRTA above its 200-day moving average?
No. On October 16, 2026 PRTA closed at $8.35, 9.9% below its 200-day simple moving average of $9.27. The 50-day average was $8.87.
How has PRTA stock performed compared with the S&P 500?
Including reinvested dividends, PRTA returned −17.2% over the past year, compared with +16.8% for the S&P 500 (SPY). Over five years the figures were −86.8% and +83.0%.
Does Prothena pay a dividend?
Prothena has not paid a dividend in the past 12 months.
How do I read the PRTA chart?
Pick a time range above the chart and choose candlesticks, a line or an area chart. Moving averages, Bollinger Bands, volume, RSI and MACD can be switched on with the indicator buttons, and "Compare" plots PRTA against the S&P 500, its sector or a competitor as a percentage change. Chart prices are adjusted for splits and dividends.