Prothena (PRTA) Insider Trading & Ownership $9.59 -0.35 (-3.52%) Closing price 04/15/2025 04:00 PM EasternExtended Trading$9.84 +0.25 (+2.60%) As of 04/15/2025 07:55 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 ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Prothena (NASDAQ:PRTA) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage28.20%Number OfInsiders Buying(Last 3 Years)1Amount OfInsider Buying(Last 3 Years)$30.84 MNumber OfInsiders Selling(Last 3 Years)12Amount OfInsider Selling(Last 3 Years)$41.40 M Get PRTA Insider Trade Alerts Want to know when executives and insiders are buying or selling Prothena stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily. Email Address PRTA Insider Buying and Selling by Quarter Remove Ads 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 TransactionDetails1/24/2024Karin L. WalkerCAOSell5,000$34.00$170,000.00 12/20/2023Karin L. WalkerCAOSell5,000$37.19$185,950.00 11/30/2023Karin L. WalkerCAOSell5,000$34.00$170,000.00 10/25/2023Karin L. WalkerCAOSell5,000$41.04$205,200.00 10/11/2023Brandon S. SmithCOOSell4,000$46.75$187,000.00 10/4/2023Carol D. KarpinsiderSell5,000$46.62$233,100.00 9/27/2023Michael J. MalecekinsiderSell5,000$47.38$236,900.00 9/19/2023Karin L. WalkerCAOSell5,000$52.36$261,800.00 9/13/2023Brandon S. SmithCOOSell4,000$55.49$221,960.00 9/13/2023Hideki GarreninsiderSell2,000$55.48$110,960.00 Get Insider Trades Delivered To Your InboxEnter your email address below to receive a concise daily summary of insider buying activity, insider selling activity and changes in hedge fund holdings. 9/6/2023Carol D. KarpinsiderSell5,000$54.76$273,800.00 8/30/2023Michael J. MalecekinsiderSell5,000$55.01$275,050.00 8/18/2023Karin L. WalkerCAOSell5,000$57.18$285,900.00 8/16/2023Brandon S. SmithCOOSell4,000$58.71$234,840.00 8/16/2023Hideki GarreninsiderSell2,000$58.74$117,480.00 8/2/2023Wagner M. ZagoinsiderSell4,000$67.05$268,200.00 7/26/2023Michael J. MalecekinsiderSell5,000$62.33$311,650.00 7/19/2023Karin L. WalkerCAOSell5,000$69.19$345,950.00 7/12/2023Brandon S. SmithCOOSell4,000$67.51$270,040.00 7/12/2023Hideki GarreninsiderSell2,000$67.51$135,020.00 7/5/2023Carol D. KarpinsiderSell5,000$68.13$340,650.00 7/3/2023Dennis J SelkoeDirectorSell5,000$67.43$337,150.00 6/28/2023Michael J. MalecekinsiderSell5,000$69.82$349,100.00 6/16/2023Hideki GarreninsiderSell7,331$74.00$542,494.00 6/14/2023Brandon S. SmithCOOSell5,333$73.98$394,535.34 6/14/2023Hideki GarreninsiderSell4,669$74.22$346,533.18 6/7/2023Wagner M. ZagoinsiderSell19,000$71.06$1,350,140.00 5/31/2023Michael J. MalecekinsiderSell5,000$64.64$323,200.00 5/19/2023Karin L. WalkerCAOSell5,000$74.00$370,000.00 5/17/2023Gene G KinneyCEOSell45,000$73.70$3,316,500.00 5/17/2023Tran NguyenCFOSell95,000$73.99$7,029,050.00 5/3/2023Dennis J SelkoeDirectorSell15,000$57.00$855,000.00 4/26/2023Michael J. MalecekinsiderSell5,000$53.46$267,300.00 4/19/2023Karin L. WalkerCAOSell5,000$52.90$264,500.00 3/29/2023Michael J. MalecekinsiderSell5,000$49.02$245,100.00 3/20/2023Karin L. WalkerCAOSell5,000$47.72$238,600.00 3/15/2023Karin L. WalkerCAOSell20,000$48.42$968,400.00 3/15/2023Michael J. MalecekinsiderSell15,000$48.44$726,600.00 3/15/2023Tran NguyenCFOSell10,000$48.43$484,300.00 2/15/2023Tran NguyenCFOSell10,000$53.34$533,400.00 Two Unmistakable Patterns Return… (Ad)The signs suggest we're entering one of those rare periods now. That's why Central Banks are buying gold at record pace. Why massive amounts of gold are being moved between countries. Why governments are repositioning their gold reserves. But here's what most people miss, the second pattern: During these resets, a unique anomaly appears in certain gold mining stocks. I call it the "Golden Anomaly."Each one is trading at up to an 95% discount to their true value. Click here to see the pattern bef1/18/2023Tran NguyenCFOSell10,000$55.53$555,300.00 1/10/2023Shane CookeDirectorSell5,000$52.92$264,600.00 1/5/2023Richard T CollierDirectorSell5,000$52.67$263,350.00 1/3/2023Lars EkmanInsiderSell15,834$55.98$886,387.32 12/21/2022Tran NguyenCFOSell10,000$58.97$589,700.00 12/12/2022Shane CookeDirectorSell5,000$61.04$305,200.00 12/5/2022Richard T CollierDirectorSell5,000$62.07$310,350.00 11/30/2022Michael J. MalecekinsiderSell5,000$62.28$311,400.00 11/23/2022Tran NguyenCFOSell10,000$61.09$610,900.00 11/18/2022Karin L. WalkerCAOSell10,000$57.07$570,700.00 11/10/2022Shane CookeDirectorSell5,000$56.17$280,850.00 11/7/2022Richard T CollierDirectorSell5,000$55.62$278,100.00 11/1/2022Lars EkmanInsiderSell15,833$62.88$995,579.04 10/27/2022Michael J. MalecekinsiderSell20,000$62.00$1,240,000.00 10/24/2022Karin L. WalkerCAOSell20,000$57.23$1,144,600.00 10/19/2022Tran NguyenCFOSell10,000$56.44$564,400.00 10/10/2022Shane CookeDirectorSell5,000$55.91$279,550.00 10/5/2022Richard T CollierDirectorSell5,000$57.92$289,600.00 10/3/2022Hideki GarreninsiderSell4,000$60.90$243,600.00 9/28/2022Gene G KinneyCEOSell16,412$53.38$876,072.56 9/28/2022Lars EkmanInsiderSell31,666$48.09$1,522,817.94 9/28/2022Shane CookeDirectorSell10,000$48.09$480,900.00 9/21/2022Gene G KinneyCEOSell2,720$32.02$87,094.40 9/21/2022Tran NguyenCFOSell10,000$30.75$307,500.00 9/15/2022Hideki GarreninsiderSell4,000$30.00$120,000.00 8/24/2022Tran NguyenCFOSell10,000$30.17$301,700.00 8/17/2022Gene G KinneyCEOSell2,181$32.03$69,857.43 8/12/2022Gene G KinneyCEOSell20,284$32.16$652,333.44 8/10/2022Gene G KinneyCEOSell991$32.01$31,721.91 8/5/2022Gene G KinneyCEOSell21,506$32.83$706,041.98 8/1/2022Hideki GarreninsiderSell4,000$30.52$122,080.00 7/27/2022Gene G KinneyCEOSell376$32.00$12,032.00 7/22/2022Tran NguyenCFOSell7,320$32.55$238,266.00 7/20/2022Shane CookeDirectorSell15,000$32.90$493,500.00 7/20/2022Tran NguyenCFOSell42,120$32.49$1,368,478.80 7/6/2022Hideki GarreninsiderSell8,000$30.00$240,000.00 5/5/2022Ecor1 Capital, LlcMajor ShareholderBuy1,062,736$29.02$30,840,598.72 (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, Ecor1 Capital, Llc, Gene G Kinney, Hideki Garren, Karin L. Walker, Lars Ekman, Michael J. Malecek, Richard T Collier, Shane Cooke, Tran Nguyen, and Wagner M. Zago. Learn more on insiders at PRTA. What percentage of Prothena stock is owned by insiders? 28.20% of Prothena stock is owned by insiders. Learn more on PRTA's insider holdings. Which Prothena insiders have been selling company stock? The following insiders have sold PRTA shares in the last 24 months: Brandon S. Smith ($1,308,375.34), Carol D. Karp ($847,550.00), Dennis J Selkoe ($1,192,150.00), Gene G Kinney ($3,316,500.00), Hideki Garren ($1,252,487.18), Karin L. Walker ($2,259,300.00), Michael J. Malecek ($1,763,200.00), Tran Nguyen ($7,029,050.00), and Wagner M. Zago ($1,618,340.00). How much insider selling is happening at Prothena? Insiders have sold a total of 312,333 Prothena shares in the last 24 months for a total of $20,586,952.52 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 IBRX Insider Ownership AMRX Insider Ownership MLTX Insider Ownership TWST Insider Ownership MIRM Insider Ownership VCEL Insider Ownership BHC Insider Ownership BHVN Insider Ownership TARS Insider Ownership GMTX 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 Beware of BigBear.ai: Insiders Are Selling—Should You?Top 3 Large Cap Stocks Insiders Bought in Q1: Buy, Sell, or HoldJoby Aviation: Operational Momentum vs. Market SentimentMicroStrategy Sees Insider Buy-Sell Action in Q1Casey’s General Stores Insider Buys Shares of This Must-Own Stock This page (NASDAQ:PRTA) was last updated on 4/16/2025 by MarketBeat.com Staff From Our PartnersTwo Unmistakable Patterns Return…The signs suggest we're entering one of those rare periods now. 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