Prothena (PRTA) Insider Trading & Ownership $13.01 -0.36 (-2.69%) Closing price 03/27/2025 04:00 PM EasternExtended Trading$13.00 -0.01 (-0.08%) As of 03/27/2025 04:24 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)$41.77 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 Warning: “DOGE Collapse” imminent (Ad)Elon Strikes Back You may already sense that the tide is turning against Elon Musk and DOGE. Just this week, President Trump promised to buy a Tesla to help support Musk in the face of a boycott against his company. But according to one research group, with connections to the Pentagon and the U.S. government, Elon's preparing to strike back in a much bigger way in the days ahead.Click here to see what they’re predicting now.1/18/2023Tran 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 4/11/2022Shane CookeDirectorSell5,000$35.08$175,400.00 4/5/2022Richard T CollierDirectorSell5,000$39.41$197,050.00 (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 ($2,008,300.00), 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 317,333 Prothena shares in the last 24 months for a total of $20,832,052.52 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. 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Why Investors Should Stay Bullish 3 Companies Buying Back Stock—Why It Matters This page (NASDAQ:PRTA) was last updated on 3/28/2025 by MarketBeat.com Staff From Our PartnersA $6.9 Trillion Cash Tsunami Is Coming – Move Your Money NOWExpert: "Prepare For the Mother of All Melt-Ups" In the wake of Wall Street volatility, stock-picking legen...Stansberry Research | SponsoredElon Warns: Exec Order 14024 Targets DollarExecutive Order 14024 is paving the way for irreversible damage to the dollar's value—threatening your wealth,...Priority Gold | SponsoredWarning: “DOGE Collapse” imminentElon Strikes Back You may already sense that the tide is turning against Elon Musk and DOGE. 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