Prothena (PRTA) Insider Trading & Ownership $9.92 -0.07 (-0.70%) Closing price 10/3/2025 04:00 PM EasternExtended Trading$9.82 -0.10 (-1.01%) As of 10/3/2025 05:09 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 Insider Trades Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Prothena (NASDAQ:PRTA) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage9.20%Number OfInsiders Buying(Last 12 Months)1Amount OfInsider Buying(Last 12 Months)$2.75MNumber OfInsiders Selling(Last 12 Months)0 Get PRTA Insider Trade Alerts Want to know when executives and insiders are buying or selling Prothena stock? 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PRTA Insider Buying and Selling by Quarter Prothena Insider and Congressional Trades History Insiders and Members of Congress Insiders Only Members of Congress Only Transaction Type Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 2 Years 3 Years Time Frame Start Date End Date Export to Excel Transaction DateNameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionDetails1/14/2025William P ScullyMajor ShareholderBuy100,000$12.79$1,279,000.00 12/31/2024William P ScullyMajor ShareholderBuy32,000$13.01$416,320.00 12/20/2024William P ScullyMajor ShareholderBuy2,000$15.91$31,820.00 12/18/2024William P ScullyMajor ShareholderBuy73,436$13.93$1,022,963.48 (Data available from 1/1/2013 forward) PRTA Insider Trading Activity - Frequently Asked Questions Who is on Prothena's Insider Roster? The list of insiders at Prothena includes Brandon S. Smith, Carol D. Karp, Dennis J Selkoe, Gene G Kinney, Hideki Garren, Karin L. Walker, Lars Ekman, Michael J. Malecek, Richard T Collier, Shane Cooke, Tran Nguyen, Wagner M. Zago, and William P Scully. Learn more on insiders at PRTA. What percentage of Prothena stock is owned by insiders? 9.20% of Prothena stock is owned by insiders. Learn more on PRTA's insider holdings. Which Prothena insiders have been buying company stock? The following insider purchased PRTA shares in the last 24 months: William P Scully ($2,750,103.48). How much insider buying is happening at Prothena? Insiders have purchased a total of 207,436 PRTA shares in the last 24 months for a total of $2,750,103.48 bought. Which Prothena insiders have been selling company stock? The following insiders have sold PRTA shares in the last 24 months: Brandon S. Smith ($187,000.00), Carol D. Karp ($233,100.00), and Karin L. Walker ($731,150.00). How much insider selling is happening at Prothena? Insiders have sold a total of 29,000 Prothena shares in the last 24 months for a total of $1,151,250.00 sold. Prothena Key ExecutivesDr. Gene G. Kinney Ph.D. (Age 55)President, CEO & Director Compensation: $1MMr. Tran B. Nguyen M.B.A. (Age 50)CFO & Chief Strategy Officer Compensation: $830.14kMr. Brandon S. Smith (Age 49)Chief Operating Officer Compensation: $757.79kMs. Carol D. Karp (Age 71)Chief Regulatory Officer Compensation: $701.48kDr. Wagner M. Zago (Age 51)Chief Scientific Officer Compensation: $478.79kMr. Mark C. Johnson C.F.A.Vice President of Investor RelationsMr. Michael J. Malecek (Age 58)Chief Legal Officer Compensation: $588.25kMr. David A. Ford (Age 55)Chief People Officer Dr. Chad Swanson Ph.D.Chief Development OfficerMs. Yvonne M. TchrakianCompany Secretary More Insider Trading Tools from MarketBeat Related Companies ANIP Insider Ownership ADPT Insider Ownership DYN Insider Ownership VERA Insider Ownership SRPT Insider Ownership APGE Insider Ownership NTLA Insider Ownership HROW Insider Ownership AUPH Insider Ownership IMCR Insider Ownership Insider Tracking Tools CEO Purchases/Sales CFO Purchases/Sales Top Insider Buying Stocks Top Insider Selling Stocks Insider Trades Screener Insider Trades Newsletter Congressional Stock Trades Insider Trading By Country U.S. Insider Trading Activity Canadian Insider Trading Activity U.K. Insider Trading Activity Australia Insider Trading Activity Latest Articles Oklo Insiders Sell! Oh No! 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