Avantor (AVTR) Insider Trading & Ownership $7.86 +0.23 (+2.95%) Closing price 05/20/2026 03:59 PM EasternExtended Trading$7.90 +0.04 (+0.45%) As of 07:34 AM 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 Massive. Learn more. Add Compare Share Share Insider Trades Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Avantor (NYSE:AVTR) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage0.28%Number OfInsiders Buying(Last 12 Months)4Amount OfInsider Buying(Last 12 Months)$8.32MNumber OfInsiders Selling(Last 12 Months)1Amount OfInsider Selling(Last 12 Months)$39.59K 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 Transaction DateInsiderBuy/SellNumber of SharesAverage Share PriceTotal TransactionDetails5/8/2026Gregory T LucierDirectorBuy10,000$8.32$83,200.00 5/1/2026Simon DingemansDirectorBuy25,000$8.14$203,500.00 3/10/2026Sanjeev K MehraDirectorBuy125,000$8.01$1,001,250.00 2/19/2026Gregory T LucierDirectorBuy50,000$9.16$458,000.00 2/12/2026Gregory L SummeDirectorBuy100,000$9.40$940,000.00 12/5/2025Sanjeev K MehraDirectorBuy350,000$11.09$3,881,500.00 10/30/2025Gregory L SummeDirectorBuy100,000$11.25$1,125,000.00 8/13/2025Gilbert Ray Cisneros, Jr.House (D-CA)Sell$13.08$1,001 - $15,0008/12/2025Gilbert Ray Cisneros, Jr.House (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.House (D-CA)Sell$13.60$1,001 - $15,0006/17/2025Lisa C. McClainHouse (R-MI)Sell$13.16$1,001 - $15,0006/11/2025Lisa C. McClainHouse (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 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. (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 Frederic Vanderhaegen, Gregory L Summe, Gregory T Lucier, James Bramwell, Joseph R Massaro, Sanjeev K Mehra, Simon Dingemans, and Steven W Eck. Learn more on insiders at AVTR. What percentage of Avantor stock is owned by insiders? 0.28% 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 ($2,993,000.00), Gregory T Lucier ($541,200.00), Joseph R Massaro ($99,630.00), Sanjeev K Mehra ($4,882,750.00), and Simon Dingemans ($203,500.00). How much insider buying is happening at Avantor? Insiders have purchased a total of 843,100 AVTR shares in the last 24 months for a total of $8,720,080.00 bought. Which Avantor insiders have been selling company stock? The following insiders have sold AVTR shares in the last 24 months: James Bramwell ($65,877.74), and Steven W Eck ($213,947.85). How much insider selling is happening at Avantor? Insiders have sold a total of 15,666 Avantor shares in the last 24 months for a total of $279,825.59 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 Active InsidersMichael Stubblefield (Age 53)President, CEO & DirectorThomas A Szlosek (Age 62)CFOSteven W Eck (Age 49)CAORajiv GuptaDirectorJo NatauriDirectorChristi ShawDirectorJoseph R MassaroDirectorGregory L SummeDirector1 recent tradesSanjeev K MehraDirector2 recent tradesGregory T LucierDirector2 recent tradesSimon DingemansDirector1 recent tradesGerard Brophy (Age 60)EVPFrederic Vanderhaegen (Age 58)EVPJustin Miller (Age 59)EVPDevashish OhriEVPJames BramwellEVPChristophe CouturierEVPMichael Wondrasch (Age 56)EVP More Insider Trading Tools from MarketBeat Related Companies A Insider Selling DHR Insider Selling RVTY Insider Selling TMO Insider Selling VLTO Insider Selling FTV Insider Selling NVMI Insider Selling ST Insider Selling RAL Insider Selling MIR 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 Latest Articles 3 Dividend Stocks With Insiders Buying in 2026Insider Buying Says Upstart Isn’t Down for the CountInsider Trades: Okta and Abbott See Buys, Micron Insiders SellMarketBeat Week in Review – 05/04 - 05/08BlackBerry Rewrites Its Own Operating System This page (NYSE:AVTR) was last updated on 5/21/2026 by MarketBeat.com Staff. 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