Prothena (PRTA) News Today $8.38 -0.39 (-4.45%) Closing price 04:00 PM EasternExtended Trading$8.36 -0.03 (-0.30%) As of 07:02 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 Headlines Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock PRTA Latest News All Sources Trusted Sources MarketBeat Barchart 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 August 2025 July 2025 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 Time Period Wellington Management Group LLP Acquires 68,652 Shares of Prothena Corporation plc $PRTAAugust 25 at 4:41 AM | marketbeat.comProthena (NASDAQ:PRTA) Stock Passes Below 200 Day Moving Average - Time to Sell?August 24 at 3:51 AM | marketbeat.comAnalysts Set Prothena Corporation plc (NASDAQ:PRTA) Price Target at $30.25August 17, 2025 | americanbankingnews.comProthena Corporation plc (NASDAQ:PRTA) Receives Consensus Recommendation of "Hold" from AnalystsAugust 15, 2025 | marketbeat.comProthena (NASDAQ:PRTA) Stock Price Passes Below Two Hundred Day Moving Average - Should You Sell?August 14, 2025 | marketbeat.comCitizens JMP Remains a Buy on Prothena (PRTA)August 9, 2025 | theglobeandmail.comFY2026 EPS Estimates for Prothena Lifted by Chardan CapitalAugust 9, 2025 | marketbeat.comCantor Fitzgerald Increases Earnings Estimates for ProthenaAugust 8, 2025 | marketbeat.comFY2025 EPS Estimates for Prothena Reduced by HC WainwrightAugust 8, 2025 | marketbeat.comNovo Nordisk Commits To Advancing Prothena Corp-Developed Drug Into Late Stage Trial: Retail Turns HopefulAugust 7, 2025 | msn.comProthena (NASDAQ:PRTA) Price Target Cut to $10.00 by Analysts at Royal Bank Of CanadaAugust 6, 2025 | marketbeat.comProthena Announces that Novo Nordisk Will Advance Coramitug (Formerly PRX004) into Phase 3 Development for ATTR Amyloidosis with CardiomyopathyAugust 6, 2025 | businesswire.comProthena's (PRTA) Buy Rating Reiterated at HC WainwrightAugust 6, 2025 | marketbeat.comProthena (NASDAQ:PRTA) Given "Buy" Rating at Chardan CapitalAugust 6, 2025 | marketbeat.comProthena (NASDAQ:PRTA) Announces Earnings Results, Misses Expectations By $0.80 EPSAugust 5, 2025 | marketbeat.com9 Analysts Assess Prothena Corp: What You Need To KnowAugust 5, 2025 | benzinga.comProthena Reports Q2 2025 Financial Results and Pipeline ProgressAugust 4, 2025 | tipranks.comProthena Reports Second Quarter 2025 Financial Results and Business HighlightsAugust 4, 2025 | businesswire.comProthena Corporation plc (NASDAQ:PRTA) Shares Purchased by DCF Advisers LLCAugust 4, 2025 | marketbeat.comFederated Hermes Inc. Sells 199,922 Shares of Prothena Corporation plc (NASDAQ:PRTA)August 3, 2025 | marketbeat.comA Glimpse of Prothena Corp's Earnings PotentialAugust 2, 2025 | benzinga.comProthena Secures Leadership with New Executive AgreementsJuly 31, 2025 | msn.comProthena (PRTA) Projected to Post Earnings on MondayJuly 30, 2025 | marketbeat.comProthena to Report Second Quarter 2025 Financial Results on August 4July 28, 2025 | finance.yahoo.comProthena (NASDAQ:PRTA) Stock Price Passes Below Two Hundred Day Moving Average - Time to Sell?July 12, 2025 | marketbeat.comProthena (NASDAQ:PRTA) Stock Price Passes Below 200 Day Moving Average - Should You Sell?July 4, 2025 | marketbeat.comProthena Corporation plc (NASDAQ:PRTA) Given Consensus Rating of "Hold" by AnalystsJune 25, 2025 | marketbeat.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.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▼0.840.70▲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▼24▲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. Email Address Related Companies and Tools Related Companies Dyne Therapeutics News Today Apogee Therapeutics News Today Twist Bioscience News Today Travere Therapeutics News Today Biohaven News Today Immunocore News Today Cidara Therapeutics News Today Aurinia Pharmaceuticals News Today WAVE Life Sciences News Today Janux Therapeutics News Today Headlines Tools Trending Media MentionsHigh Media Sentiment StocksLive News FeedMarketBeat OriginalsStock Ideas This page (NASDAQ:PRTA) was last updated on 8/25/2025 by MarketBeat.com Staff From Our PartnersBONUS GUIDE - Ben Stein Prepares For the Next Financial CrisisWith inflation high, debt soaring, and global tensions rising, a financial storm may be brewing. Economist ...Goldco Precious Metals | SponsoredGENIUS Act: Cancel Your Money?A new law called the GENIUS Act could quietly trigger the most radical shift in American finance in decades. 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