Prothena (PRTA) Stock Chart & Stock Price History $6.93 +0.06 (+0.87%) Closing price 04:00 PM EasternExtended Trading$6.88 -0.05 (-0.79%) As of 06:31 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Prothena Stock Price Performance The Prothena (PRTA) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 71.09%, with a year-to-date return of -49.96%. In the past month, the stock has increased 13.98%, reflecting recent market activity. As of the latest close, Prothena traded at $6.87 with a market cap of $369.81 million and volume of 804,697 shares. Five years ago, the stock traded at $12.54, representing a 44.74% decrease over that period. At the time, it had a market cap of $500.47 million and a volume of 197,942 shares. Receive PRTA Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Prothena and its competitors with MarketBeat's FREE daily newsletter. Email Address 5 Day Performance+3.43%1 Month Performance+13.98%3 Month Performance-28.48%Year-To-Date Performance-49.96%1 Year Performance-71.09%5 Year Performance-44.74% PRTA Stock Chart for Tuesday, July, 29, 2025 PRTA Chart by TradingView Prothena Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization07/29/2025$6.87$6.93+0.87%$7.10$6.80724,870 shs$373.04 million07/28/2025$6.68$6.87+2.84%$6.89$6.63804,697 shs$369.81 million07/25/2025$6.70$6.68-0.30%$6.86$6.58771,560 shs$359.58 million07/24/2025$6.76$6.70-0.89%$6.76$6.54717,762 shs$360.64 million07/23/2025$6.53$6.76+3.52%$6.94$6.51898,765 shs$363.89 million07/22/2025$6.29$6.53+3.82%$6.59$6.29722,319 shs$351.51 million07/21/2025$6.26$6.29+0.48%$6.52$6.24686,660 shs$338.57 million07/18/2025$6.47$6.26-3.25%$6.62$6.25788,135 shs$336.98 million07/17/2025$6.32$6.47+2.37%$6.60$6.32743,432 shs$348.26 million07/16/2025$6.22$6.32+1.61%$6.44$6.19675,075 shs$340.21 million Get the Latest News and Ratings for PRTA and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Prothena and its competitors with MarketBeat's FREE daily newsletter. 07/15/2025$6.43$6.22-3.27%$6.46$6.16730,504 shs$334.80 million07/14/2025$6.40$6.43+0.47%$6.50$6.33792,505 shs$346.11 million07/11/2025$6.57$6.40-2.59%$6.52$6.31569,147 shs$344.49 million07/10/2025$6.58$6.57-0.15%$6.68$6.43804,438 shs$353.66 million07/09/2025$6.52$6.58+0.92%$6.77$6.55695,703 shs$354.20 million07/08/2025$6.29$6.52+3.66%$6.67$6.291.02 million shs$350.95 million07/07/2025$6.47$6.29-2.78%$6.47$6.23896,818 shs$338.59 million07/04/2025$6.47$6.47$6.46$6.21636,811 shs$348.26 million07/03/2025$6.32$6.47+2.37%$6.46$6.21636,811 shs$348.28 million07/02/2025$6.26$6.32+0.96%$6.59$6.131.11 million shs$340.21 million07/01/2025$6.07$6.26+3.13%$6.49$5.961.51 million shs$336.98 million06/30/2025$6.08$6.07-0.16%$6.24$6.061.14 million shs$326.75 million Related Companies AbCellera Biologics Stock Chart Harrow Stock Chart WAVE Life Sciences Stock Chart Intellia Therapeutics Stock Chart Pharvaris Stock Chart CureVac Stock Chart Cidara Therapeutics Stock Chart Phibro Animal Health Stock Chart Calliditas Therapeutics AB (publ) Stock Chart Aurinia Pharmaceuticals Stock Chart Receive PRTA Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Prothena and its competitors with MarketBeat's FREE daily newsletter. 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