AVTR insider buying – Avantor, Inc.
20 insider purchases since 2016 worth $17.3M by 12 different insiders. Last 12 months: 7 purchases, $7.6M. Most recent filing: 2026-05-11.
Large company Public float $9.2B (latest 10-K, SEC).
Same time range as the chart above - each mark sits under the week of the trade. Circles = purchases (height = price paid, size = amount), red triangles = open-market sales of $50k+. Prices as reported, not adjusted for later stock splits. 1 older purchase (before the 5-year window) is listed in the table below.
Purchases are open-market buys (SEC Form 4, code "P") - insiders paying with their own money. Sales are open-market sales (code "S") of $50,000 or more; many sales are pre-planned (Rule 10b5-1) or made for taxes and diversification. Each row links to the original filing.
Bought, sold, still holding?
| Insider | Bought | First / last buy | Sold since 2016 | Holds now* | Status |
|---|---|---|---|---|---|
| Connolly Thomas Director | $5.2M 1× · 320,827 sh | 2019-05-17 2019-05-17 | 1× · $5.3M last 2019-05-17 | 72,632,694 shares as of 2021-05-07 | Holds (sold earlier) |
| MEHRA SANJEEV K Director | $4.9M 2× · 475,000 sh | 2025-12-05 2026-03-10 | – | 508,376 shares as of 2026-05-11 | Holds - never sold |
| SUMME GREGORY L Director | $4.6M 7× · 400,000 sh | 2025-04-28 2026-02-12 | – | 483,381 shares as of 2026-05-11 | Holds - never sold |
| Ligner Emmanuel CEO | $993,125 1× · 87,500 sh | 2025-11-17 2025-11-17 | – | 737,334 shares as of 2026-08-20 | Holds - never sold |
| LUCIER GREGORY T Director | $541,200 2× · 60,000 sh | 2026-02-19 2026-05-08 | – | 94,006 shares as of 2026-05-11 | Holds - never sold |
| Stubblefield Michael CEO | $314,250 1× · 15,000 sh | 2022-11-16 2022-11-16 | 3× · $35.5M last 2021-09-20 | 1,917,522 shares as of 2025-05-21 | Holds (sold earlier) |
| Szlosek Thomas A CFO | $258,875 1× · 12,500 sh | 2022-11-16 2022-11-16 | – | 254,440 shares as of 2023-05-19 | Holds - never sold |
| Dingemans Simon Director | $203,500 1× · 25,000 sh | 2026-05-01 2026-05-01 | – | 31,495 shares as of 2026-05-11 | Holds - never sold |
| Peacock Jonathan M Director | $103,646 1× · 8,091 sh | 2025-04-28 2025-04-28 | – | 219,815 shares as of 2025-05-12 | Holds - never sold |
| Massaro Joseph R Director | $99,630 1× · 8,100 sh | 2025-04-29 2025-04-29 | – | 77,408 shares as of 2026-05-11 | Holds - never sold |
| Kang Lan Director | $62,850 1× · 5,000 sh | 2025-04-28 2025-04-28 | – | 52,315 shares as of 2025-05-12 | Holds - never sold |
| Natauri Jo Director | $10,899 1× · 300 sh | 2021-07-12 2021-07-12 | 1× · $80.6M last 2021-05-11 | 650,317 shares as of 2021-08-13 | Holds (sold earlier) |
* Shares held after the insider's most recent SEC filing for this company (all share classes, direct and indirect). If an insider stops filing, later changes are not known.
Insider buying and selling by year
| Year | Purchases | Bought | Buyers | Sales | Sold |
|---|---|---|---|---|---|
| 2026 | 5 | $2.7M | 4 | – | – |
| 2025 | 11 | $8.8M | 6 | 2 | $182,617 |
| 2024 | 0 | – | – | 6 | $1.0M |
| 2023 | 0 | – | – | 8 | $1.7M |
| 2022 | 2 | $573,125 | 2 | 5 | $4.9M |
| 2021 | 2 | $5.3M | 2 | 42 | $194.1M |
| 2020 | 0 | – | – | 16 | $2,264.7M |
Insider purchases
| Filed | Insider | Role | Shares | Avg price | Value | Holdings | Filing |
|---|---|---|---|---|---|---|---|
| 2026-05-11 | LUCIER GREGORY T | Director | 10,000 | $8.32 | $83,200 | +20.0% | SEC |
| 2026-05-05 | Dingemans Simon | Director | 25,000 | $8.14 | $203,500 | SEC | |
| 2026-03-11 | MEHRA SANJEEV K | Director | 125,000 | $8.01 | $1.0M | +35.7% | SEC |
| 2026-02-23 | LUCIER GREGORY T | Director | 50,000 | $9.16 | $458,000 | SEC | |
| 2026-02-12 | SUMME GREGORY L | Director | 100,000 | $9.40 | $940,000 | +33.3% | SEC |
| 2025-12-09 | MEHRA SANJEEV K | Director | 350,000 | $11.09 | $3.9M | SEC | |
| 2025-11-17 | Ligner Emmanuel | CEO | 87,500 | $11.35 | $993,125 | +44.7% | SEC |
| 2025-10-31 | SUMME GREGORY L | Director | 100,000 | $11.25 | $1.1M | +50.0% | SEC |
| 2025-08-22 | SUMME GREGORY L | Director | 100,000 | $12.56 | $1.3M | +100.0% | SEC |
| 2025-05-27 | SUMME GREGORY L | Director | 30,000 | $12.50 | $375,000 | +42.9% | SEC |
| 2025-05-22 | SUMME GREGORY L | Director | 20,000 | $12.65 | $253,000 | +40.0% | SEC |
| 2025-05-09 | SUMME GREGORY L | Director | 25,000 | $12.00 | $300,000 | +100.0% | SEC |
| 2025-04-29 | Massaro Joseph R | Director | 8,100 | $12.30 | $99,630 | +30.1% | SEC |
| 2025-04-29 | SUMME GREGORY L | Director | 25,000 | $12.50 | $312,500 | SEC | |
| 2025-04-29 | Peacock Jonathan M | Director | 8,091 | $12.81 | $103,646 | +4.2% | SEC |
| 2025-04-29 | Kang Lan | Director | 5,000 | $12.57 | $62,850 | +16.5% | SEC |
| 2022-11-17 | Szlosek Thomas A | CFO | 12,500 | $20.71 | $258,875 | +54.0% | SEC |
| 2022-11-17 | Stubblefield Michael | CEO | 15,000 | $20.95 | $314,250 | +3.6% | SEC |
| 2021-08-13 | Natauri Jo | Director | 300 | $36.33 | $10,899 | +0.1% | SEC |
| 2021-05-07 | Connolly Thomas | Director | 320,827 | $16.33 | $5.2M | +0.4% | SEC |
Insider sales
| Filed | Insider | Role | Shares | Avg price | Value | Type | Filing |
|---|---|---|---|---|---|---|---|
| 2025-02-28 | Eck Steven W | Officer | 5,940 | $17.44 | $103,581 | Pre-planned (10b5-1) | SEC |
| 2025-02-28 | Bramwell James | Officer | 4,532 | $17.44 | $79,036 | Pre-planned (10b5-1) | SEC |
| 2024-09-06 | Eck Steven W | Officer | 3,525 | $25.06 | $88,336 | Sale | SEC |
| 2024-08-01 | Couturier Christophe | Officer | 10,100 | $27.01 | $272,800 | Pre-planned (10b5-1) | SEC |
| 2024-03-12 | Eck Steven W | Officer | 3,685 | $25.63 | $94,447 | Pre-planned (10b5-1) | SEC |
| 2024-03-01 | Couturier Christophe | Officer | 13,074 | $24.53 | $320,705 | Sale | SEC |
| 2024-03-01 | Bramwell James | Officer | 4,910 | $24.52 | $120,393 | Sale | SEC |
| 2024-02-27 | Bramwell James | Officer | 6,203 | $24.49 | $151,911 | Sale | SEC |
| 2023-09-07 | Eck Steven W | Officer | 7,577 | $20.64 | $156,389 | Sale | SEC |
| 2023-08-28 | Vanderhaegen Frederic | Officer | 25,000 | $21.47 | $536,750 | Sale | SEC |
| 2023-03-06 | Brophy Gerard | Officer | 3,914 | $25.00 | $97,850 | Sale | SEC |
| 2023-03-01 | Couturier Christophe | Officer | 2,324 | $24.32 | $56,520 | Sale | SEC |
| 2023-03-01 | Brophy Gerard | Officer | 3,059 | $25.00 | $76,475 | Sale | SEC |
| 2023-02-27 | Couturier Christophe | Officer | 3,078 | $24.24 | $74,611 | Sale | SEC |
| 2023-02-22 | Couturier Christophe | Officer | 19,160 | $24.12 | $462,139 | Sale | SEC |
Showing the latest 15 of 79 sales of $50,000+ since 2016.
Compiled automatically from public SEC filings. Not investment advice. Get every new insider purchase in the daily report.
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