Prothena (PRTA) Insider Trading & Ownership $14.68 -0.02 (-0.13%) As of 10:04 AM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Insider Trades Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrends 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 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 We recommended Palantir in 2021, now we're recommending this... (Ad)Simply put: All the grandiose claims you hear about AI will amount to nothing without one key investment. That's why I believe the biggest AI gains will NOT come from the "Next NVIDIA"... or some obscure AI startup you've never heard of. In fact, I'm convinced the biggest gains will come from one company that - at first glance - has nothing to do with AI at all. It's a Texas-based firm that provides the backbone for the entire $15.7 trillion AI industry.Check out my latest investor briefing by clicking here 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 ($3,466,300.00), Michael J. Malecek ($2,734,900.00), Tran Nguyen ($8,046,750.00), and Wagner M. Zago ($1,618,340.00). How much insider selling is happening at Prothena? Insiders have sold a total of 377,333 Prothena shares in the last 24 months for a total of $23,783,352.52 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 ACLX Insider Ownership DNLI Insider Ownership IMVT Insider Ownership TWST Insider Ownership XENE Insider Ownership ACAD Insider Ownership VCEL Insider Ownership ZLAB Insider Ownership MLTX Insider Ownership BHC 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 Insider Selling in Tech Stocks Spikes in Q43 Small-Cap Stocks Insiders and Institutions Are Buying3 Stocks With Strong Capital Returns and Insider Buying SignalsZymeworks in Focus for Insider Activity: Catalysts AheadInsiders Are Loading Up: 3 Key Stock Picks for Investors This page (NASDAQ:PRTA) was last updated on 1/31/2025 by MarketBeat.com Staff From Our Partners Is Starlink Set For The Largest IPO In History?He turned PayPal from a tiny, off-the-radar startup… to a massive $64 billion giant. 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