NewAmsterdam Pharma (NAMS) Insider Trading & Ownership $23.91 -0.04 (-0.15%) As of 09:57 AM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Insider Trades Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock NewAmsterdam Pharma (NASDAQ:NAMS) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage20.84%Number OfInsiders Buying(Last 12 Months)2Amount OfInsider Buying(Last 12 Months)$375.18KNumber OfInsiders Selling(Last 12 Months)4Amount OfInsider Selling(Last 12 Months)$20.65M Get NAMS Insider Trade Alerts Want to know when executives and insiders are buying or selling NewAmsterdam Pharma stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily. 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NAMS Insider Buying and Selling by Quarter NewAmsterdam Pharma 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 TransactionDetails8/25/2025Louise Frederika KooijCAOSell8,269$24.86$205,567.34 8/21/2025Johannes Jacob Piete KasteleinInsiderSell50,000$24.29$1,214,500.00 8/11/2025James N TopperDirectorBuy471$23.98$11,294.58 7/16/2025Douglas F KlingCOOSell51,043$21.10$1,077,007.30 7/15/2025Douglas F KlingCOOSell47,569$21.44$1,019,879.36 6/25/2025James N TopperDirectorBuy1,260$18.26$23,007.60 6/24/2025James N TopperDirectorBuy2,520$18.43$46,443.60 6/16/2025Douglas F KlingCOOSell100,000$19.29$1,929,000.00 6/16/2025James N TopperDirectorBuy8,584$19.50$167,388.00 3/26/2025James N TopperDirectorBuy1,135$22.49$25,526.15 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. 3/4/2025James N TopperDirectorBuy4,005$21.02$84,185.10 3/4/2025Louise Frederika KooijCAOSell150,000$20.37$3,055,500.00 12/30/2024Nap B.V. ForgrowthMajor ShareholderSell29,846$25.54$762,266.84 12/26/2024Nap B.V. ForgrowthMajor ShareholderSell33,438$26.01$869,722.38 12/23/2024Nap B.V. ForgrowthMajor ShareholderSell25,132$25.49$640,614.68 12/20/2024Nap B.V. ForgrowthMajor ShareholderSell49,772$25.60$1,274,163.20 12/18/2024Nap B.V. ForgrowthMajor ShareholderSell100,728$26.10$2,629,000.80 12/12/2024Nap B.V. ForgrowthMajor ShareholderSell166,011$25.39$4,215,019.29 11/18/2024Nap B.V. ForgrowthMajor ShareholderSell33,273$25.08$834,486.84 11/15/2024Nap B.V. ForgrowthMajor ShareholderSell8,530$25.02$213,420.60 10/1/2024Louise Frederika KooijCAOSell45,000$15.72$707,400.00 9/26/2024Juliette Berangere AudetInsiderBuy1,104$15.70$17,332.80 (Data available from 1/1/2013 forward) NAMS Insider Trading Activity - Frequently Asked Questions Who is on NewAmsterdam Pharma's Insider Roster? The list of insiders at NewAmsterdam Pharma includes Douglas F Kling, James N Topper, Johannes Jacob Piete Kastelein, Juliette Berangere Audet, Louis G Lange, Louise Frederika Kooij, Michael H Davidson, and Nap B.V. Forgrowth. Learn more on insiders at NAMS. What percentage of NewAmsterdam Pharma stock is owned by insiders? 20.84% of NewAmsterdam Pharma stock is owned by insiders. Learn more on NAMS's insider holdings. Which NewAmsterdam Pharma insiders have been buying company stock? The following insiders have purchased NAMS shares in the last 24 months: James N Topper ($539,068.53), Juliette Berangere Audet ($17,332.80), Louis G Lange ($95,000.00), and Michael H Davidson ($86,300.00). How much insider buying is happening at NewAmsterdam Pharma? Insiders have purchased a total of 37,508 NAMS shares in the last 24 months for a total of $737,701.33 bought. Which NewAmsterdam Pharma insiders have been selling company stock? The following insiders have sold NAMS shares in the last 24 months: Douglas F Kling ($4,025,886.66), Johannes Jacob Piete Kastelein ($5,309,734.00), Louise Frederika Kooij ($3,968,467.34), and Nap B.V. Forgrowth ($11,438,694.63). How much insider selling is happening at NewAmsterdam Pharma? Insiders have sold a total of 1,089,087 NewAmsterdam Pharma shares in the last 24 months for a total of $24,742,782.63 sold. NewAmsterdam Pharma Key ExecutivesDr. Michael Harvey Davidson FACC (Age 68)Facp., M.D., CEO, President, Executive Board Member & Director Compensation: $885.6kDr. Johannes Jacob Pieter Kastelein FESC (Age 70)M.D., Ph.D., Founder, Chief Scientific Officer, Member of Executive Board & Director Compensation: $677.76k1 recent tradesMr. Mayur Amrat Somaiya (Age 50)Chief Financial Officer Compensation: $402.3kMs. Juliette Audet M.B.A. (Age 37)M.Sc., Chief Business Officer Compensation: $45.62kMr. Douglas F. Kling (Age 51)Chief Operating Officer 3 recent tradesMs. Louise Kooij (Age 48)Chief Accounting Officer Mr. Matthew PhilippeExecutive VP &Head of Investor RelationsMr. Jim JacobsonChief Legal Officer & SecretaryMr. Bob RamboExecutive Vice President of MarketingDr. Marc Ditmarsch M.D. (Age 57)Chief Development Officer More Insider Trading Tools from MarketBeat Related Companies MRNA Insider Transactions BBIO Insider Transactions ELAN Insider Transactions VRNA Insider Transactions ROIV Insider Transactions GRFS Insider Transactions RVMD Insider Transactions RYTM Insider Transactions RNA Insider Transactions AXSM Insider Transactions 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 Costco Faces Downgrades, Death Cross, Insider SellingReynolds Consumer Products Stock Price: Insiders Signal a BottomBuy, Sell, or Hold? Insiders Pile Into These 3 Healthcare StocksInsiders Trade Millions in NVIDIA-Linked Navitas, Hims, & Shift45 Stocks Insiders Are Selling That Analysts Say Buy This page (NASDAQ:NAMS) was last updated on 8/29/2025 by MarketBeat.com Staff From Our PartnersMusk’s Project Colossus could mint millionairesI predict this single breakthrough could make Elon the world’s first trillionaire — and mint more new milliona...Brownstone Research | SponsoredINVESTOR ALERT: Tiny “$3 AI Wonder Stock” on the Verge of Blasting OffRight now, we’re witnessing a monumental shift in the world.Traders Agency | SponsoredBONUS GUIDE - Ben Stein Prepares For the Next Financial CrisisWith inflation high, debt soaring, and global tensions rising, a financial storm may be brewing. 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