Prothena (PRTA) Insider Trading & Ownership $9.20 -0.49 (-5.06%) As of 04:00 PM Eastern Add Compare Share Share Insider Trades Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Prothena (NASDAQ:PRTA) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage9.20%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 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 They rigged the game (Ad)The U.S. fired the first shot with 145% tariffs. Apple relies heavily on Chinese production. Tesla needs China for growth. Nvidia depends on the global chip chain. The MAG 7 have already bled $3.4 trillion — and the next phase could be worse. But while panic sets in, there's a small group of investors pulling in reliable, high-yield monthly income…Watch how this works — and why it's gaining steam fast.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 (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? 9.20% 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 ($1,994,800.00), Michael J. Malecek ($1,495,900.00), 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 302,333 Prothena shares in the last 24 months for a total of $20,055,152.52 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 SDGR Insider Ownership DNLI Insider Ownership MIRM Insider Ownership TARS Insider Ownership GMTX Insider Ownership BEAM Insider Ownership NAMS Insider Ownership KYMR Insider Ownership BHC Insider Ownership JANX 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 5 Mid-Cap Stocks Insiders Are Buying This YearInsider Buying in This Stock Reiterates Analysts Bullish OutlookBeware of BigBear.ai: Insiders Are Selling—Should You?XPO Buying $50 Million of Its Own Stock: Here's Why Top 3 Large Cap Stocks Insiders Bought in Q1: Buy, Sell, or Hold This page (NASDAQ:PRTA) was last updated on 4/30/2025 by MarketBeat.com Staff From Our PartnersTrump Orders 'National Digital Asset Stockpile'‘Digital Asset Reserve’ for THIS Coin??? Get all the details before this story gains even more tractionCrypto 101 Media | SponsoredSecret financial plot unfolding in Washington DC… [DEVELOPING]What stocks are next up to soar in 2025? I believe I’ve found the answer - and it might surprise you. Yo...Timothy Sykes | SponsoredM.A.G.A. is Finished – This Could be even BetterYou’ve no doubt heard Trump’s rally cry: Make America Great Again. But recently the President made a big ch...Paradigm Press | SponsoredURGENT: This Altcoin Opportunity Won’t Wait – Act NowThe July 23rd Crypto Trigger Could Mark the Beginning of Bitcoin’s Next Big Move Bitcoin’s early 2024 ETF r...Crypto Swap Profits | SponsoredNow I look stupid. Real stupid... I thought what happened 25 years ago was a once- in-a-lifetime event… but how wrong I was. Because here we...Porter & Company | SponsoredElon Musk’s next move from the Oval Office?No one is closer to President Trump than Tesla CEO Elon Musk. He's been dubbed Trump's "first buddy." Tr...Weiss Ratings | SponsoredChina’s next move could destroy U.S. techThe U.S. fired the first shot with 145% tariffs. Apple relies heavily on Chinese production. Tesla needs Ch...Investors Alley | SponsoredThis isn’t a trade war. It’s worse…Investigative Journalist Bombhsell: The Curse on the U.S Dollar Depleted retirement accounts? Meme coin inv...Stansberry Research | Sponsored Adding Choose a watchlist: Watchlist Adding You have already added five stocks to your watchlist. Upgrade to MarketBeat All Access to add more stocks to your watchlist. Adding Prothena Co. plc Please log in to your account or sign up in order to add this asset to your watchlist. Share Prothena With A Colleague Link copied to clipboard. Get 30 Days of MarketBeat All Access for Free Sign up for MarketBeat All Access to gain access to MarketBeat's full suite of research tools. Start Your 30-Day Trial MarketBeat All Access Features Best-in-Class Portfolio Monitoring Get personalized stock ideas. Compare portfolio to indices. Check stock news, ratings, SEC filings, and more. Stock Ideas and Recommendations See daily stock ideas from top analysts. Receive short-term trading ideas from MarketBeat. Identify trending stocks on social media. Advanced Stock Screeners and Research Tools Use our seven stock screeners to find suitable stocks. Stay informed with MarketBeat's real-time news. Export data to Excel for personal analysis. Sign in to your free account to enjoy these benefits In-depth profiles and analysis for 20,000 public companies. Real-time analyst ratings, insider transactions, earnings data, and more. Our daily ratings and market update email newsletter. Sign in to your free account to enjoy all that MarketBeat has to offer. Sign In Create Account Your Email Address: Your Password: Log In or Sign in with Facebook Sign in with Google Forgot your password? Your Email Address: Choose a Password: Create My Account (Free) or Sign in with Facebook Sign in with Google By creating a free account, you agree to our terms of service. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Buy PRTA Stock Free PRTA Stock Alerts