Prothena (PRTA) Stock Chart & Stock Price History $15.56 +0.31 (+2.03%) Closing price 02/21/2025 04:00 PM EasternExtended Trading$15.10 -0.46 (-2.96%) As of 02/21/2025 04:31 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 ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrends Prothena Stock Price Performance 5 Day Performance+9.81%1 Month Performance+7.83%3 Month Performance+6.58%6 Month Performance-26.78%Year-To-Date Performance+12.35%1 Year Performance-42.26% 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 Saturday, February, 22, 2025 PRTA Chart by TradingView 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 Capitalization02/21/2025$15.25$15.56+2.03%$16.67$14.77732,645 shs$837.28 million02/20/2025$14.98$15.25+1.80%$15.32$14.79357,679 shs$820.60 million02/19/2025$13.91$14.98+7.69%$15.08$13.69563,342 shs$806.07 million02/18/2025$14.17$13.91-1.83%$14.73$13.79265,532 shs$748.50 million02/17/2025$14.17$14.17$14.53$13.63204,629 shs$762.49 million02/14/2025$13.89$14.17+2.02%$14.53$13.63204,629 shs$762.47 million02/13/2025$13.82$13.89+0.51%$13.92$13.15263,677 shs$747.42 million02/12/2025$13.79$13.82+0.22%$13.92$13.36249,411 shs$743.65 million02/11/2025$14.07$13.79-1.99%$14.11$13.17274,904 shs$742.04 million02/10/2025$14.05$14.07+0.14%$14.33$13.84239,179 shs$757.11 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. 02/07/2025$14.44$14.05-2.70%$14.75$13.86309,588 shs$756.03 million02/06/2025$14.78$14.44-2.30%$14.95$14.41229,086 shs$777.02 million02/05/2025$14.49$14.78+2.00%$15.09$14.15296,448 shs$795.31 million02/04/2025$13.44$14.49+7.81%$14.54$13.31513,463 shs$779.71 million02/03/2025$14.23$13.44-5.55%$14.09$13.20356,132 shs$723.21 million01/31/2025$14.70$14.23-3.20%$15.25$14.07340,006 shs$765.72 million01/30/2025$15.81$14.70-7.02%$16.06$14.57318,643 shs$791.01 million01/29/2025$15.96$15.81-0.94%$16.50$15.68246,029 shs$850.74 million01/28/2025$16.04$15.96-0.50%$16.33$15.71241,118 shs$858.79 million01/27/2025$15.62$16.04+2.69%$16.64$15.61375,263 shs$863.11 million01/24/2025$15.48$15.62+0.90%$16.11$15.11340,226 shs$840.50 million01/23/2025$14.43$15.48+7.28%$15.52$14.29361,675 shs$832.98 million01/22/2025$14.11$14.43+2.27%$14.77$13.82325,353 shs$776.48 million01/21/2025$13.77$14.11+2.47%$14.26$13.79350,457 shs$759.26 million Related Companies Denali Therapeutics Stock Chart Zai Lab Stock Chart Xenon Pharmaceuticals Stock Chart Recursion Pharmaceuticals Stock Chart Twist Bioscience Stock Chart Vericel Stock Chart MorphoSys Stock Chart MoonLake Immunotherapeutics Stock Chart Merus Stock Chart Catalyst 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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