Avantor (AVTR) Insider Trading & Ownership $13.20 -0.11 (-0.79%) As of 02:32 PM 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 InterestSustainabilityTrendsBuy This Stock Avantor (NYSE:AVTR) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage1.20%Number OfInsiders Buying(Last 12 Months)2Amount OfInsider Buying(Last 12 Months)$1.03MNumber OfInsiders Selling(Last 12 Months)2Amount OfInsider Selling(Last 12 Months)$279.83K Get AVTR Insider Trade Alerts Want to know when executives and insiders are buying or selling Avantor stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily. 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AVTR Insider Buying and Selling by Quarter Avantor 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 TransactionDetails8/5/2025Steven W EckCAOSell3,476$11.39$39,591.64 7/23/2025Gilbert Ray Cisneros, Jr.U.S. Congress Member (D-CA)Sell$13.60$1,001 - $15,0006/17/2025Lisa C. McClainU.S. Congress Member (R-MI)Sell$13.16$1,001 - $15,0006/11/2025Lisa C. McClainU.S. Congress Member (R-MI)Buy$13.55$1,001 - $15,0005/23/2025Gregory L SummeDirectorBuy30,000$12.50$375,000.00 5/22/2025Gregory L SummeDirectorBuy20,000$12.65$253,000.00 5/7/2025Gregory L SummeDirectorBuy25,000$12.00$300,000.00 4/29/2025Joseph R MassaroDirectorBuy8,100$12.30$99,630.00 2/26/2025James BramwellEVPSell3,758$17.53$65,877.74 2/26/2025Steven W EckCAOSell4,907$17.53$86,019.71 9/5/2024Steven W EckCAOSell3,525$25.06$88,336.50 (Data available from 1/1/2013 forward) AVTR Insider Trading Activity - Frequently Asked Questions Who is on Avantor's Insider Roster? The list of insiders at Avantor includes Christophe Couturier, Frederic Vanderhaegen, Gerard Brophy, Gregory L Summe, James Bramwell, Joseph R Massaro, Michael Stubblefield, Steven W Eck, and Thomas A Szlosek. Learn more on insiders at AVTR. What percentage of Avantor stock is owned by insiders? 1.20% of Avantor stock is owned by insiders. Learn more on AVTR's insider holdings. Which Avantor insiders have been buying company stock? The following insiders have purchased AVTR shares in the last 24 months: Gregory L Summe ($928,000.00), and Joseph R Massaro ($99,630.00). How much insider buying is happening at Avantor? Insiders have purchased a total of 83,100 AVTR shares in the last 24 months for a total of $1,027,630.00 bought. Which Avantor insiders have been selling company stock? The following insiders have sold AVTR shares in the last 24 months: James Bramwell ($217,789.21), and Steven W Eck ($370,337.13). How much insider selling is happening at Avantor? Insiders have sold a total of 29,446 Avantor shares in the last 24 months for a total of $588,126.34 sold. Which members of congress are trading Avantor? Lisa C. McClain (R-MI) has bought shares of Avantor in the last year totaling $8,000. Gilbert Ray Cisneros, Jr. (D-CA), Lisa C. McClain (R-MI), and John James (R-MI) have sold shares totaling $24,000. Avantor Key ExecutivesMr. Michael Stubblefield (Age 51)President, CEO & Director Compensation: $1.36MMr. R. Brent Jones (Age 54)Executive VP & CFO Compensation: $461.69kMr. James Bramwell (Age 57)Executive Vice President of Sales & Customer Excellence Compensation: $571.01kMr. Steven W. Eck (Age 47)Senior VP, Corporate Controller & Chief Accounting Officer 1 recent tradesMr. Michael Wondrasch (Age 55)Executive VP & Chief Information Officer Compensation: $808.63kChristina JonesVice President of Investor RelationsMr. Claudius O. Sokenu (Age 56)Executive VP, Corporate Secretary and Chief Legal & Compliance Officer Ms. Allison K. HosakSenior Vice President of Global Communications & BrandMs. Kitty Sahin (Age 54)Executive Vice President of Strategy & Corporate Development Ms. Brittany Hankamer (Age 53)Executive VP & Chief HR Officer More Insider Trading Tools from MarketBeat Related Companies A Insider Selling DHR Insider Selling IQV Insider Selling TMO Insider Selling KEYS Insider Selling VLTO Insider Selling TER Insider Selling FTV Insider Selling RVTY Insider Selling VNT Insider Selling 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 Reynolds 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 BuyStrategy Insiders Buy In While Analysts Predict Big Upside This page (NYSE:AVTR) was last updated on 8/27/2025 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 | 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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