Avantor (AVTR) Insider Trading & Ownership $12.71 +0.32 (+2.58%) Closing price 03:59 PM EasternExtended Trading$12.70 -0.01 (-0.04%) As of 05:39 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 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)$191.49K Get AVTR Insider Trade Alerts Want to know when executives and insiders are buying or selling Avantor stock? 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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 TransactionDetails8/13/2025Gilbert Ray Cisneros, Jr.U.S. Congress Member (D-CA)Sell$13.08$1,001 - $15,0008/12/2025Gilbert Ray Cisneros, Jr.U.S. Congress Member (D-CA)Sell$12.65$1,001 - $15,0008/5/2025Steven 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 (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 ($213,947.85). How much insider selling is happening at Avantor? Insiders have sold a total of 21,869 Avantor shares in the last 24 months for a total of $431,737.06 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) and Lisa C. McClain (R-MI) have sold shares totaling $32,000. 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 $100 Million Buyback in Upwork Stock Follows a Strong Quarter Insiders Sell These High-Quality Stocks: Why Investors Shouldn’tCoreWeave and Madrigal's Insider Trades Flash Bullish SignalsPalantir Insider Selling: Risk Signal or Normal Activity?Loop Industries Insiders Buy Stock, Signal Confidence in Outlook This page (NYSE:AVTR) was last updated on 9/16/2025 by MarketBeat.com Staff From Our PartnersFanatics Hit $31B-Is This Nasdaq Next?Fanatics built an empire by owning the fan experience-scaling to a $31B valuation. 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