Prothena (PRTA) Stock Chart & Stock Price History $13.01 -0.36 (-2.69%) Closing price 03/27/2025 04:00 PM EasternExtended Trading$13.00 -0.01 (-0.08%) As of 03/27/2025 04:24 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 ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Prothena Stock Price Performance 5 Day Performance+0.31%1 Month Performance-17.71%3 Month Performance-14.07%6 Month Performance-35.11%Year-To-Date Performance-6.06%1 Year Performance-47.48% 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 PRTA Stock Chart for Friday, March, 28, 2025 PRTA Chart by TradingViewRemove Ads Prothena Stock Price History Daily Weekly Monthly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year Time Frame * Start Date * End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization03/27/2025$13.37$13.01-2.69%$13.52$12.71284,214 shs$700.29 million03/26/2025$12.65$13.37+5.69%$13.39$12.46672,308 shs$719.67 million03/25/2025$13.34$12.65-5.17%$13.30$12.57391,185 shs$680.91 million03/24/2025$12.97$13.34+2.85%$13.71$13.11356,248 shs$718.05 million03/21/2025$12.87$12.97+0.78%$12.99$12.54869,554 shs$698.14 million03/20/2025$12.88$12.87-0.08%$13.22$12.78399,083 shs$692.75 million03/19/2025$12.83$12.88+0.39%$13.28$12.58344,179 shs$693.29 million03/18/2025$13.74$12.83-6.62%$13.74$12.82479,927 shs$690.60 million03/17/2025$13.74$13.74$13.95$13.00521,961 shs$739.58 million03/14/2025$14.07$13.74-2.35%$14.34$13.51431,415 shs$739.58 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. 03/13/2025$13.86$14.07+1.52%$14.29$13.43379,193 shs$757.35 million03/12/2025$13.75$13.86+0.80%$14.24$13.62319,182 shs$746.04 million03/11/2025$14.60$13.75-5.82%$14.60$13.41629,066 shs$740.12 million03/10/2025$15.27$14.60-4.39%$15.14$14.29281,939 shs$785.87 million03/07/2025$15.13$15.27+0.93%$15.63$14.91380,051 shs$821.66 million03/06/2025$14.95$15.13+1.20%$15.54$14.38326,633 shs$814.13 million03/05/2025$15.06$14.95-0.73%$15.48$14.33584,046 shs$804.45 million03/04/2025$14.33$15.06+5.09%$15.51$13.89574,345 shs$810.36 million03/03/2025$15.81$14.33-9.36%$16.05$14.31600,029 shs$771.08 million02/28/2025$15.13$15.81+4.49%$16.16$15.16514,558 shs$850.72 million02/27/2025$14.55$15.13+3.99%$15.19$14.54332,159 shs$814.13 million Related Companies MorphoSys Stock Chart Xenon Pharmaceuticals Stock Chart Amneal Pharmaceuticals Stock Chart Recursion Pharmaceuticals Stock Chart Twist Bioscience Stock Chart Bausch Health Companies Stock Chart NewAmsterdam Pharma Stock Chart HUTCHMED Stock Chart MoonLake Immunotherapeutics Stock Chart ImmunityBio 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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