Prothena (PRTA) Insider Trading & Ownership $8.50 -0.22 (-2.52%) Closing price 05/2/2025 04:00 PM EasternExtended Trading$8.56 +0.06 (+0.76%) As of 05/2/2025 07:31 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 OwnershipPercentage9.20%Number OfInsiders Buying(Last 12 Months)1Amount OfInsider Buying(Last 12 Months)$2.75 MNumber OfInsiders Selling(Last 12 Months)0 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 TransactionDetails1/14/2025William 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, Ecor1 Capital, Llc, 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 ($1,308,375.34), Carol D. Karp ($847,550.00), Dennis J Selkoe ($337,150.00), 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 287,333 Prothena shares in the last 24 months for a total of $19,200,152.52 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 MIRM Insider Ownership BHC Insider Ownership BEAM Insider Ownership GMTX Insider Ownership NAMS Insider Ownership VCEL Insider Ownership TARS Insider Ownership JANX Insider Ownership SDGR Insider Ownership ARWR 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 McDonald’s Insiders Sell Shares! Investors Should Do the Opposite5 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 This page (NASDAQ:PRTA) was last updated on 5/4/2025 by MarketBeat.com Staff From Our PartnersTrump to redistribute trillions of dollars Trump’s Final Reset Inside the shocking plot to re-engineer America’s financial system…and why you need to ...Porter & Company | 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 | SponsoredWill May start the next "Great Depression?"You probably haven't heard about this yet... But this could be the biggest wealth building opportunity of t...Behind the Markets | SponsoredGold Alert: The Truth About Fort Knox Is ComingOwning physical gold isn’t the best way to profit. I’ve found a better way to invest in gold—one that’s alr...Golden Portfolio | SponsoredDOGE officially begins retirement transformationElon Musk's Department of Government Efficiency ("DOGE") just announced the first-ever "fully digital retireme...Altimetry | SponsoredWhy Elon put $51 million into thisWhile fear dominates the headlines, a silent breakthrough could turn panic into profit. The future of AI fa...True Market Insiders | SponsoredURGENT: This Altcoin Opportunity Won’t Wait – Act NowMy friends Joel and Adam have a simple motto: "For us, it's always a bull market." That’s because their 92%...Crypto Swap Profits | SponsoredTrump to solve American wealth loss?Is President Trump’s Executive Order 14179… A secret way to restore wealth for good citizens? If you’ve ...Paradigm Press | 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: Email Address Required Your Password: Password Required Log In or Sign in with Facebook Sign in with Google Forgot your password? Your Email Address: Please enter your email address. Please enter a valid email address Choose a Password: Please enter your password. Your password must be at least 8 characters long and contain at least 1 number, 1 letter, and 1 special character. 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.