Prothena (PRTA) Stock Chart & Stock Price History $6.40 -0.17 (-2.59%) Closing price 07/11/2025 04:00 PM EasternExtended Trading$6.26 -0.14 (-2.17%) As of 07/11/2025 05:36 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 71.52%, with a year-to-date return of -53.79%. In the past month, the stock has increased 25.98%, reflecting recent market activity. As of the latest close, Prothena traded at $6.40 with a market cap of $344.49 million and volume of 569,147 shares. Five years ago, the stock traded at $11.65, representing a 45.06% decrease over that period. At the time, it had a market cap of $453.39 million and a volume of 461,452 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-1.84%1 Month Performance+25.98%3 Month Performance-37.38%Year-To-Date Performance-53.79%1 Year Performance-71.52%5 Year Performance-45.06% PRTA Stock Chart for Sunday, July, 13, 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 Capitalization07/11/2025$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 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. 06/27/2025$6.18$6.08-1.62%$6.41$6.012.69 million shs$327.29 million06/26/2025$5.99$6.18+3.17%$6.33$5.832.13 million shs$332.65 million06/25/2025$6.07$5.99-1.32%$6.14$5.841.20 million shs$322.44 million06/24/2025$6.06$6.07+0.17%$6.28$5.861.62 million shs$326.75 million06/23/2025$5.72$6.06+5.94%$6.36$5.702.45 million shs$326.21 million06/20/2025$5.75$5.72-0.52%$6.05$5.643.57 million shs$307.91 million06/19/2025$5.75$5.75$6.03$5.675.01 million shs$309.52 million06/18/2025$5.70$5.75+0.88%$6.03$5.675.01 million shs$309.52 million06/17/2025$5.66$5.70+0.71%$6.00$5.513.13 million shs$306.81 million06/16/2025$5.08$5.66+11.42%$5.77$5.292.18 million shs$304.66 million06/13/2025$5.07$5.08+0.20%$5.15$4.95806,357 shs$273.44 million06/12/2025$5.10$5.07-0.59%$5.18$5.01652,023 shs$272.90 million Related Companies Edgewise Therapeutics Stock Chart Mesoblast Stock Chart Travere Therapeutics Stock Chart CureVac Stock Chart Calliditas Therapeutics AB (publ) Stock Chart Structure Therapeutics Stock Chart Harrow Stock Chart Phibro Animal Health Stock Chart AbCellera Biologics Stock Chart Intellia Therapeutics 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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