Avantor, Inc.
A maker of mission-critical materials for labs and biopharma, Avantor sells high-purity chemicals (J.T. Baker), tubing (Masterflex), and medical-grade silicones (NuSil), delivered worldwide through its VWR channel. Its roots trace to 1904, when chemist John Townsend Baker began producing purer lab reagents; NuSil and the 1852-founded VWR distributor later joined the fold. Fun fact: in a 1993 silicone shortage, NuSil cloned discontinued materials so device makers could keep producing long-term implants.
Granted 5.00M · Bought 320.8K · Sold 14.05M
Granted 5.00M · Bought 336.0K · Sold 14.09M
Sold 82.48M
Granted 3.75M · Bought 15.0K · Sold 1.14M
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Granted 5.00M · Bought 336.3K · Sold 16.71M
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| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Connolly ThomasDirector · 34 transactions | — | 131.50Mas of May 2020 | 5.00M | 320.8K | 14.05M |
| Goldman Sachs & Co. LLC +8 co-filers10% owner · 64 transactions | — | 131.49Mas of Jul 2020 | 5.00M | 336.0K | 14.09M |
| Klinsky Steven B +5 co-filers10% owner · 4 transactions | — | 28.00Mas of Nov 2020 | — | — | 82.48M |
| Stubblefield MichaelPresident & CEO, Director · 51 transactions | — | 3.84Mas of May 2025 | 3.75M | 15.0K | 1.14M |
| Gupta RajivDirector · 20 transactions | — | 1.06Mas of Apr 2022 | 1.85M | — | 1.13M |
| Mehra Sanjeev KDirector · 4 transactions | — | 866.5K | 33.4K | 475.0K | — |
| Natauri JoDirector · 68 transactions | — | 825.9Kas of Aug 2021 | 5.00M | 336.3K | 16.71M |
| Ligner EmmanuelPresident and CEO, Director · 3 transactions | — | 767.1K | 679.6K | 87.5K | — |
| Summe Gregory LDirector · 15 transactions | — | 483.4K | 83.4K | 400.0K | — |
| Jones R. BrentEVP, Chief Financial Officer · 7 transactions | — | 419.8K | 429.8K | — | — |
| Walker CoreyPresident, VWR Dist. & Servs. · 7 transactions | — | 384.5K | 509.5K | — | — |
| Gourdier BenoitEVP, Bioscience & Medtech · 10 transactions | — | 362.9K | 375.4K | — | — |
| Szlosek Thomas AEVP & CFO · 22 transactions | — | 254.4Kas of May 2023 | 396.3K | 12.5K | — |
| Blenn MaryEVP, Chief Operating Officer · 2 transactions | — | 253.4K | 253.4K | — | — |
| Sokenu ClaudiusEVP, Chief Legal & Compliance · 10 transactions | — | 252.4K | 266.3K | — | — |
| Hankamer BrittanyEVP, Chief HR Officer · 17 transactions | — | 249.0K | 231.2K | — | — |
| Ohri DevashishEVP, IMEA · 34 transactions | — | 239.1Kas of May 2021 | 735.3K | — | 536.4K |
| Peacock Jonathan MDirector · 10 transactions | — | 219.8Kas of May 2025 | 194.0K | 8.1K | — |
| Couturier ChristopheEVP, AMEA · 54 transactions | — | 211.3Kas of Aug 2025 | 479.2K | — | 192.6K |
| McAllister EricEVP, CHRO · 4 transactions | — | 197.9Kas of May 2020 | 145.5K | — | — |
| Vanderhaegen FredericEVP, Americas and Europe · 29 transactions | — | 160.7Kas of Aug 2023 | 416.0K | — | 241.9K |
| Hofman BjornEVP and COO · 1 transaction | — | 157.1Kas of May 2019 | 157.1K | — | — |
| Lucier Gregory TDirector · 4 transactions | — | 152.7K | 34.0K | 60.0K | — |
| Brellier LudovicEVP, Bioscience & Medtech · 1 transaction | — | 146.6K | 146.6K | — | — |
| Eck Steven WSVP & Chief Accounting Officer · 42 transactions | — | 131.0K | 176.5K | — | 41.6K |
| Kulkarni AshishSee Remarks · 1 transaction | — | 128.6Kas of May 2019 | 128.6K | — | — |
| Wondrasch MichaelEVP & CIO · 16 transactions | — | 96.1Kas of Feb 2023 | 234.3K | — | 94.0K |
| Miller JustinEVP & General Counsel · 22 transactions | — | 93.3Kas of May 2023 | 296.4K | — | 144.3K |
| Brophy GerardEVP, Biopharma Production · 44 transactions | — | 89.0Kas of May 2023 | 924.6K | — | 712.5K |
| Bramwell JamesEVP Sales, Customer Excellence · 31 transactions | — | 86.6Kas of Feb 2025 | 193.6K | — | 55.1K |
| Severino MichaelDirector · 8 transactions | — | 85.8K | 85.8K | — | — |
| Massaro Joseph RDirector · 8 transactions | — | 77.4K | 69.3K | 8.1K | — |
| Lewis SheriEVP, Global Ops & Supply Chain · 10 transactions | — | 70.7Kas of Dec 2023 | 88.9K | — | — |
| Murthy MalaDirector · 7 transactions | — | 69.5K | 69.5K | — | — |
| Stone Randy LeeEVP, Laboratory Solutions · 3 transactions | — | 68.1Kas of Apr 2024 | 74.0K | — | — |
| Andres JuanDirector · 8 transactions | — | 65.5Kas of May 2025 | 65.5K | — | — |
| Dingemans SimonDirector · 3 transactions | — | 56.5K | 31.5K | 25.0K | — |
| Kang LanDirector · 7 transactions | — | 52.3Kas of May 2025 | 47.3K | 5.0K | — |
| Makin LouiseDirector · 3 transactions | — | 47.1K | 47.1K | — | — |
| Carethers JohnDirector · 6 transactions | — | 45.9Kas of May 2025 | 45.9K | — | — |
| Sahin KittyEVP, Strategy&Corp Development · 5 transactions | — | 42.3Kas of Jul 2024 | 24.5K | — | — |
| Henson MeghanEVP, Chief HR Officer · 9 transactions | — | 40.2Kas of Feb 2023 | 46.4K | — | — |
| Foxe TanyaEVP, Operations & Supply Chain · 2 transactions | — | 39.5Kas of Feb 2020 | 39.5K | — | — |
| Shaw ChristiDirector · 7 transactions | — | 36.3Kas of May 2023 | 50.6K | — | 14.3K |
| Sachdev RakeshDirector · 3 transactions | — | 32.8Kas of Feb 2021 | 32.8K | — | — |
| Henrichwark SvenEVP, APAC Region · 2 transactions | — | 19.8Kas of Feb 2021 | 19.8K | — | — |
| Murray Mark ChristopherEVP, Biomaterials & AT · 4 transactions | — | 18.7Kas of Jan 2022 | 20.5K | — | — |
| Holt Matthew S.Director · 2 transactions | — | 7.9Kas of May 2022 | 7.9K | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over all recorded history: -129.54M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.