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 25.3K · Bought 125.0K
Granted 25.3K
Granted 25.3K · Bought 10.0K
Granted 146.6K
Granted 31.6K
Granted 25.3K
Granted 25.3K
Granted 25.3K
Granted 25.3K · Bought 25.0K
Granted 25.3K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Mehra Sanjeev KDirector · 2 transactions | — | 866.5K | 25.3K | 125.0K | — |
| Summe Gregory LDirector · 1 transaction | +5.5% | 483.4K | 25.3K | — | — |
| Walker CoreyPresident, VWR Dist. & Servs. · 1 transaction | -0.8% | 384.5K | — | — | — |
| Lucier Gregory TDirector · 2 transactions | — | 152.7K | 25.3K | 10.0K | — |
| Brellier LudovicEVP, Bioscience & Medtech · 1 transaction | — | 146.6K | 146.6K | — | — |
| Eck Steven WSVP & Chief Accounting Officer · 1 transaction | +31.9% | 131.0K | 31.6K | — | — |
| Severino MichaelDirector · 1 transaction | +41.7% | 85.8K | 25.3K | — | — |
| Massaro Joseph RDirector · 1 transaction | +48.5% | 77.4K | 25.3K | — | — |
| Murthy MalaDirector · 1 transaction | +57.2% | 69.5K | 25.3K | — | — |
| Dingemans SimonDirector · 2 transactions | — | 56.5K | 25.3K | 25.0K | — |
| Makin LouiseDirector · 1 transaction | +115.5% | 47.1K | 25.3K | — | — |
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 the last 6 months: +160.0K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.