Prothena (PRTA) Stock Chart & Stock Price History $5.08 -0.02 (-0.39%) As of 03:28 PM Eastern Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider 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 76.35%, with a year-to-date return of -63.32%. In the past month, the stock has decreased 33.25%, reflecting recent market activity. As of the latest close, Prothena traded at $5.10 with a market cap of $274.52 million and volume of 843,264 shares. Five years ago, the stock traded at $9.96, representing a 49.00% decrease over that period. At the time, it had a market cap of $424.26 million and a volume of 304,400 shares. 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Email Address 5 Day Performance-6.10%1 Month Performance-33.25%3 Month Performance-63.35%Year-To-Date Performance-63.32%1 Year Performance-76.35%5 Year Performance-49.00% PRTA Stock Chart for Thursday, June, 12, 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 Capitalization06/11/2025$5.26$5.10-3.04%$5.39$5.09843,264 shs$274.52 million06/10/2025$5.25$5.26+0.19%$5.45$5.22694,221 shs$283.13 million06/09/2025$5.41$5.25-2.96%$5.53$5.052.32 million shs$282.59 million06/06/2025$5.06$5.41+6.92%$5.44$5.051.25 million shs$291.20 million06/05/2025$4.88$5.06+3.69%$5.20$4.761.50 million shs$272.37 million06/04/2025$4.83$4.88+1.04%$4.88$4.661.14 million shs$262.68 million06/03/2025$4.66$4.83+3.65%$4.85$4.531.31 million shs$259.98 million06/02/2025$4.59$4.66+1.53%$4.81$4.531.78 million shs$250.83 million05/30/2025$4.70$4.59-2.34%$4.70$4.421.96 million shs$247.07 million05/29/2025$4.60$4.70+2.17%$4.94$4.635.38 million shs$252.99 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. 05/28/2025$4.58$4.60+0.44%$4.85$4.326.24 million shs$247.60 million05/27/2025$6.58$4.58-30.40%$5.35$4.459.65 million shs$246.53 million05/26/2025$6.58$6.58$6.62$6.361.71 million shs$354.18 million05/23/2025$6.55$6.58+0.46%$6.62$6.361.71 million shs$354.18 million05/22/2025$6.82$6.55-3.96%$6.88$6.52933,156 shs$352.57 million05/21/2025$7.29$6.82-6.45%$7.24$6.621.14 million shs$367.10 million05/20/2025$7.40$7.29-1.49%$7.59$7.231.25 million shs$392.40 million05/19/2025$7.18$7.40+3.06%$7.41$7.00758,460 shs$398.32 million05/16/2025$6.72$7.18+6.85%$7.33$6.651.17 million shs$386.48 million05/15/2025$6.89$6.72-2.47%$6.92$6.471.12 million shs$361.72 million05/14/2025$7.59$6.89-9.22%$7.70$6.821.88 million shs$370.87 million05/13/2025$7.61$7.59-0.26%$7.76$7.412.21 million shs$408.55 million05/12/2025$7.43$7.61+2.42%$8.05$7.171.42 million shs$409.62 million Related Companies Phibro Animal Health Stock Chart Arcus Biosciences Stock Chart Wave Life Sciences Stock Chart Syndax Pharmaceuticals Stock Chart Collegium Pharmaceutical Stock Chart Enliven Therapeutics Stock Chart Spyre Therapeutics Stock Chart Nurix Therapeutics Stock Chart Niagen Bioscience Stock Chart Ardelyx 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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