Prothena (PRTA) Stock Chart & Stock Price History $6.55 -0.27 (-3.96%) Closing price 05/22/2025 04:00 PM EasternExtended Trading$6.90 +0.35 (+5.27%) As of 05:31 AM 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 The Prothena (PRTA) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 67.41%, with a year-to-date return of -52.71%. In the past month, the stock has decreased 31.70%, reflecting recent market activity. As of the latest close, Prothena traded at $6.55 with a market cap of $352.57 million and volume of 933,156 shares. Five years ago, the stock traded at $11.88, representing a 44.87% decrease over that period. At the time, it had a market cap of $481.51 million and a volume of 191,148 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-8.77%1 Month Performance-31.70%3 Month Performance-57.90%Year-To-Date Performance-52.71%1 Year Performance-67.41%5 Year Performance-44.87% PRTA Stock Chart for Friday, May, 23, 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 Capitalization05/22/2025$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 million05/09/2025$7.10$7.43+4.65%$8.08$6.921.66 million shs$399.94 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. 05/08/2025$7.29$7.10-2.61%$7.44$7.011.71 million shs$382.17 million05/07/2025$7.35$7.29-0.82%$7.52$7.172.00 million shs$392.40 million05/06/2025$8.08$7.35-9.03%$8.80$7.354.16 million shs$395.63 million05/05/2025$8.50$8.08-4.94%$8.75$8.003.01 million shs$434.92 million05/02/2025$8.72$8.50-2.52%$9.50$8.255.55 million shs$457.53 million05/01/2025$9.20$8.72-5.22%$9.27$8.581.94 million shs$469.37 million04/30/2025$9.69$9.20-5.06%$9.58$9.17989,315 shs$495.21 million04/29/2025$9.65$9.69+0.41%$9.77$9.44445,954 shs$521.58 million04/28/2025$9.70$9.65-0.52%$9.81$9.37573,554 shs$519.43 million04/25/2025$9.65$9.70+0.52%$9.84$9.39490,570 shs$522.12 million04/24/2025$9.59$9.65+0.63%$9.98$9.45385,916 shs$519.43 million04/23/2025$9.54$9.59+0.52%$10.07$9.44836,739 shs$516.20 million04/22/2025$9.30$9.54+2.58%$9.65$9.211.08 million shs$513.51 million Related Companies IDEAYA Biosciences Stock Chart Edgewise Therapeutics Stock Chart Immunocore Stock Chart Travere Therapeutics Stock Chart Mesoblast Stock Chart Structure Therapeutics Stock Chart Janux Therapeutics Stock Chart Evotec Stock Chart ARS Pharmaceuticals Stock Chart Adaptive Biotechnologies 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. This page (NASDAQ:PRTA) was last updated on 5/23/2025 by MarketBeat.com Staff From Our PartnersMarket Panic: Trump Just Dropped a Bomb on Your Stockstock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tarif...American Alternative | SponsoredWhite House to reset Social Security?Elon Musk's parting DOGE gift looks set to shock America... A single announcement by July 22nd could soon b...Altimetry | SponsoredBuffett’s favorite chart just hit 209% – here’s what that means for goldA Historic Gold Announcement Is About to Rock Wall Street For months, sharp-eyed analysts have watched the ...Golden Portfolio | SponsoredEveryone’s watching Nvidia right now. Here’s why I’m excited.So, unless you’ve been living under a rock, you probably saw the news… Nvidia just signed a $7 BILLION deal...Timothy Sykes | SponsoredIs President Trump Lying To You With This?President Trump’s economic transition isn’t without hardship. But what if there were a smart, tax-free way to ...Colonial Metals | SponsoredJuly 2025 Rule Change to Impact Retirement InvestorsThere's a massive change from a new rule going into effect this July. And it's one the Big Banks are alread...Premier Gold Co | SponsoredTrump’s Bitcoin Reserve is No Accident…Bitcoin's supply is being drained at unprecedented rates, but while most investors focus solely on Bitcoin, th...Crypto 101 Media | SponsoredSilver Is the New Oil—And the World’s Running DryElon's Next Market Move Could Send Silver Soaring Every industry Elon Musk touches explodes—from Tesla to S...Priority Gold | Sponsored Adding Choose a watchlist: Watchlist Adding You have already added five stocks to your watchlist. Upgrade to MarketBeat All Access to add more stocks to your watchlist. Adding Prothena Co. plc Please log in to your account or sign up in order to add this asset to your watchlist. Share Prothena With A Colleague Link copied to clipboard. Get 30 Days of MarketBeat All Access for Free Sign up for MarketBeat All Access to gain access to MarketBeat's full suite of research tools. Start Your 30-Day Trial MarketBeat All Access Features Best-in-Class Portfolio Monitoring Get personalized stock ideas. Compare portfolio to indices. Check stock news, ratings, SEC filings, and more. Stock Ideas and Recommendations See daily stock ideas from top analysts. Receive short-term trading ideas from MarketBeat. Identify trending stocks on social media. Advanced Stock Screeners and Research Tools Use our seven stock screeners to find suitable stocks. Stay informed with MarketBeat's real-time news. Export data to Excel for personal analysis. Sign in to your free account to enjoy these benefits In-depth profiles and analysis for 20,000 public companies. Real-time analyst ratings, insider transactions, earnings data, and more. Our daily ratings and market update email newsletter. Sign in to your free account to enjoy all that MarketBeat has to offer. Sign In Create Account Your Email Address: Email Address Required Your Password: Password Required Log In or Sign in with Facebook Sign in with Google Forgot your password? Your Email Address: Please enter your email address. Please enter a valid email address Choose a Password: Please enter your password. Your password must be at least 8 characters long and contain at least 1 number, 1 letter, and 1 special character. Create My Account (Free) or Sign in with Facebook Sign in with Google By creating a free account, you agree to our terms of service. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Buy PRTA Stock Free PRTA Stock Alerts