Prothena (PRTA) News Today $6.08 -0.10 (-1.62%) Closing price 06/27/2025 04:00 PM EasternExtended Trading$6.38 +0.30 (+4.85%) As of 08:17 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 Headlines Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock PRTA Latest News All Sources Trusted Sources MarketBeat Benzinga Bloomberg GlobeNewswire GuruFocus MarketWatch Motley Fool NASDAQ PR Newswire Reuters Seeking Alpha TalkMarkets The Street TipRanks The Wall Street Journal Wall Street Zen Yahoo Finance Source Sentiment refers to the positivity or negativity of each headline according to our language processing algorithm. Sentiment All Sentiments Very Positive Positive Neutral Negative Very Negative Most Recent June 2025 May 2025 April 2025 March 2025 February 2025 January 2025 December 2024 November 2024 October 2024 September 2024 August 2024 July 2024 June 2024 May 2024 April 2024 March 2024 February 2024 January 2024 December 2023 November 2023 October 2023 September 2023 August 2023 July 2023 June 2023 May 2023 April 2023 March 2023 February 2023 January 2023 December 2022 November 2022 October 2022 September 2022 August 2022 July 2022 Time Period Prothena Corporation plc (NASDAQ:PRTA) Receives $31.50 Average PT from Analysts5 hours ago | americanbankingnews.comProthena Corporation plc (NASDAQ:PRTA) Given Consensus Rating of "Hold" by AnalystsJune 25, 2025 | marketbeat.comProthena (NASDAQ:PRTA) Earns Neutral Rating from Cantor FitzgeraldJune 21, 2025 | americanbankingnews.comProthena Corp (PRTA) Receives Reiterated Neutral Rating from Cantor Fitzgerald | PRTA Stock NewsJune 20, 2025 | gurufocus.comCantor Fitzgerald Reiterates "Neutral" Rating for Prothena (NASDAQ:PRTA)June 20, 2025 | marketbeat.comRoche’s Phase 3 Move Boosts Outlook for Prothena Corporation plc (PRTA)June 19, 2025 | finance.yahoo.comProthena Announces Corporate RestructuringJune 18, 2025 | finance.yahoo.comProthena (NASDAQ:PRTA) Shares Pass Below 200 Day Moving Average - Time to Sell?June 18, 2025 | marketbeat.comRoche’s Phase 3 Move Boosts Outlook for Prothena Corporation plc (PRTA)June 17, 2025 | msn.comProthena’s Partner Roche to Advance Prasinezumab into Phase III Development for Early-Stage Parkinson's DiseaseJune 16, 2025 | uk.finance.yahoo.comProthena's Partner Roche to Advance Prasinezumab into Phase III Development for Early-Stage Parkinson's DiseaseJune 16, 2025 | businesswire.comProthena Co. plc (NASDAQ:PRTA) Short Interest Down 50.7% in MayJune 14, 2025 | marketbeat.comCantor Fitzgerald Weighs in on Prothena FY2026 EarningsJune 10, 2025 | marketbeat.comPRTA Prothena Corporation plcJune 7, 2025 | seekingalpha.comProthena Co. plc (NASDAQ:PRTA) Short Interest Up 20.1% in MayJune 5, 2025 | marketbeat.comUBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Trims Stake in Prothena Co. plc (NASDAQ:PRTA)June 3, 2025 | marketbeat.comProthena Co. plc (NASDAQ:PRTA) Given Consensus Recommendation of "Hold" by BrokeragesJune 1, 2025 | marketbeat.comFY2025 EPS Estimates for Prothena Cut by Chardan CapitalMay 31, 2025 | marketbeat.comPiper Sandler Reduces Prothena (PRTA) Price Target to $81 from $110 Following AFFIRM-AL Trial DiscontinuationMay 30, 2025 | msn.comChardan Lowers Prothena (PRTA) Price Target Following AFFIRM-AL Trial FailureMay 30, 2025 | msn.comH.C. Wainwright Maintains Buy Rating on Prothena Corporation (NASDAQ:PRTA), Cuts PTMay 30, 2025 | insidermonkey.comFY2027 EPS Estimates for Prothena Decreased by HC WainwrightMay 30, 2025 | marketbeat.comWellington Management Group LLP Increases Position in Prothena Co. plc (NASDAQ:PRTA)May 30, 2025 | marketbeat.comOppenheimer Downgrades Prothena Corporation (NASDAQ:PRTA) to Perform from OutperformMay 30, 2025 | finance.yahoo.comB of A Securities Downgrades Prothena (PRTA)May 29, 2025 | msn.comProthena (NASDAQ:PRTA) Lowered to Underperform Rating by Bank of AmericaMay 29, 2025 | marketbeat.comJefferies Downgrades Prothena Corporation (PRTA) After Negative Trial ResultsMay 28, 2025 | finance.yahoo.comOppenheimer Downgrades Prothena Corporation (NASDAQ:PRTA) to Perform from OutperformMay 28, 2025 | insidermonkey.comPiper Sandler Issues Pessimistic Forecast for Prothena (NASDAQ:PRTA) Stock PriceMay 28, 2025 | marketbeat.comProthena Target of Unusually High Options Trading (NASDAQ:PRTA)May 28, 2025 | marketbeat.comJMP Securities Cuts Prothena (NASDAQ:PRTA) Price Target to $29.00May 28, 2025 | marketbeat.comProthena (NASDAQ:PRTA) Downgraded by Cantor Fitzgerald to NeutralMay 28, 2025 | marketbeat.comProthena (NASDAQ:PRTA) Downgraded by Jefferies Financial Group to HoldMay 28, 2025 | marketbeat.comProthena (NASDAQ:PRTA) Cut to Market Perform at OppenheimerMay 28, 2025 | marketbeat.comChardan Capital Lowers Prothena (NASDAQ:PRTA) Price Target to $18.00May 28, 2025 | marketbeat.comHC Wainwright Issues Pessimistic Forecast for Prothena (NASDAQ:PRTA) Stock PriceMay 28, 2025 | marketbeat.comAnalysts Offer Insights on Healthcare Companies: Prothena (PRTA) and Bristol-Myers Squibb (BMY)May 28, 2025 | theglobeandmail.comPeninsula biotech Prothena falters — again — and layoffs are on the wayMay 27, 2025 | bizjournals.comProthena: Despite Phase 3 Trial Failure, Other Neurodegenerative Programs In PlaceMay 27, 2025 | seekingalpha.comProthena hits 52-week low amid downgrades after late-stage trial setbackMay 27, 2025 | msn.comJefferies Downgrades Prothena Corporation (PRTA) After Negative Trial ResultsMay 27, 2025 | insidermonkey.comWhy Is Prothena Stock Trading Lower On Tuesday?May 27, 2025 | benzinga.comDeutsche Bank AG Purchases 63,512 Shares of Prothena Co. plc (NASDAQ:PRTA)May 26, 2025 | marketbeat.comProthena Announces Phase 3 AFFIRM-AL Clinical Trial for Birtamimab in Patients with AL Amyloidosis Did Not Meet Primary EndpointMay 23, 2025 | businesswire.comBNP Paribas Financial Markets Purchases 41,541 Shares of Prothena Co. plc (NASDAQ:PRTA)May 22, 2025 | marketbeat.comBalyasny Asset Management L.P. Makes New $527,000 Investment in Prothena Co. plc (NASDAQ:PRTA)May 18, 2025 | marketbeat.comCantor Fitzgerald Upgrades Prothena (NASDAQ:PRTA) to "Strong-Buy"May 17, 2025 | marketbeat.comProsight Management LP Sells 65,345 Shares of Prothena Co. plc (NASDAQ:PRTA)May 17, 2025 | marketbeat.comProthena Shareholders Approve Key Amendments at AGMMay 16, 2025 | tipranks.comCantor Fitzgerald Expects Increased Earnings for ProthenaMay 16, 2025 | marketbeat.com Get Prothena News Delivered to You Automatically Sign up to receive the latest news and ratings for PRTA and its competitors with MarketBeat's FREE daily newsletter. Email Address PRTA Media Mentions By Week PRTA Media Sentiment Learn about the media sentiment score. Each headline receives a score ranging from 2 (good news) to -2 (bad news). Our company news sentiment scores track the average news sentiment of articles about each company over the most recent 7 days in order to identify companies that are receiving positive press. PRTA News Sentiment▼1.450.93▲Average Medical News Sentiment PRTA News Coverage Learn about the media coverage comparison. We track news headlines from hundreds of news outlets and tag them by company. This chart compares the number of articles about this company in the last seven days compared with the average number of articles about this company on a typical week. PRTA Articles This Week▼34▲PRTA Articles Average Week Get Prothena News Delivered to You Automatically Sign up to receive the latest news and ratings for PRTA and its competitors with MarketBeat's FREE daily newsletter. 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