| $385M | ||
| $350M | ||
| $215M | ||
| $94M | ||
| $82M | ||
| $62M |
Buys | $8,762,251 | 11 | 69 |
Sells | $222,208 | 5 | 31 |
| MEHRA SANJEEV K | director | 1 | $3.88M | 0 | $0 | $3.88M |
| SUMME GREGORY L | director | 6 | $3.62M | 0 | $0 | $3.62M |
| Ligner Emmanuel | President and CEO | 1 | $993,125 | 0 | $0 | $993,125 |
| Peacock Jonathan M | director | 1 | $103,646 | 0 | $0 | $103,646 |
| Massaro Joseph R | director | 1 | $99,630 | 0 | $0 | $99,630 |
| Kang Lan | director | 1 | $62,850 | 0 | $0 | $62,850 |
| Bramwell James | EVP Sales, Customer Excellence | 0 | $0 | 2 | $79,036 | $-79,036 |
| Eck Steven W | SVP & Chief Accounting Officer | 0 | $0 | 3 | $143,172 | $-143,172 |
Avantor, Inc. provides products and services to customers in biopharma, healthcare, education and government, advanced technologies, and applied materials industries in the Americas, Europe, Asia, the Middle East, and Africa. The company offers materials and consumables, such as purity chemicals and reagents, lab products and supplies, formulated silicone materials, customized excipients, customized single-use assemblies, process chromatography resins and columns, analytical sample prep kits, education and microbiology products, clinical trial kits, peristaltic pumps, and fluid handling tips. It also provides equipment and instrumentation products, including filtration systems, virus inactivation systems, incubators, analytical instruments, evaporators, ultra-low-temperature freezers, biological safety cabinets, and critical environment supplies. In addition, the company offers services and specialty procurements comprising onsite lab and production, clinical, equipment, procurement and sourcing, and biopharmaceutical material scale-up and development services. Avantor, Inc. was founded in 1904 and is headquartered in Radnor, Pennsylvania.
Over the last 12 months, insiders at Avantor, Inc. have bought $8.76M and sold $222,208 worth of Avantor, Inc. stock.
On average, over the past 5 years, insiders at Avantor, Inc. have bought $3.12M and sold $36.42M worth of stock each year.
Highest buying activity among insiders over the last 12 months: MEHRA SANJEEV K (director) — $3.88M. SUMME GREGORY L (director) — $3.62M. Ligner Emmanuel (President and CEO) — $993,125.
The last purchase of 350,000 shares for transaction amount of $3.88M was made by MEHRA SANJEEV K (director) on 2025‑12‑05.
| 2025-12-05 | MEHRA SANJEEV K | director | 350,000 0.0521% | $11.09 | $3.88M | +4.85% | ||
| 2025-11-17 | Ligner Emmanuel | President and CEO | 87,500 0.0134% | $11.35 | $993,125 | +5.33% | ||
| 2025-10-30 | SUMME GREGORY L | director | 100,000 0.0107% | $11.25 | $1.13M | +4.07% | ||
| 2025-08-21 | SUMME GREGORY L | director | 100,000 0.0147% | $12.56 | $1.26M | -4.76% | ||
| 2025-08-05 | Sale | Eck Steven W | SVP & Chief Accounting Officer | 3,476 0.0005% | $11.39 | $39,592 | +3.97% | |
| 2025-05-23 | SUMME GREGORY L | director | 30,000 0.0043% | $12.50 | $375,000 | +1.10% | ||
| 2025-05-22 | SUMME GREGORY L | director | 20,000 0.0029% | $12.65 | $253,000 | -0.27% | ||
| 2025-05-07 | SUMME GREGORY L | director | 25,000 0.0037% | $12.00 | $300,000 | +7.62% | ||
| 2025-04-29 | Massaro Joseph R | director | 8,100 0.0012% | $12.30 | $99,630 | +1.26% | ||
| 2025-04-28 | Peacock Jonathan M | director | 8,091 0.0012% | $12.81 | $103,646 | +2.84% | ||
| 2025-04-28 | Kang Lan | director | 5,000 0.0007% | $12.57 | $62,850 | +2.84% | ||
| 2025-04-28 | SUMME GREGORY L | director | 25,000 0.0035% | $12.50 | $312,500 | +2.84% | ||
| 2025-02-27 | Sale | Bramwell James | EVP Sales, Customer Excellence | 774 0.0001% | $17.00 | $13,158 | -20.92% | |
| 2025-02-27 | Sale | Eck Steven W | SVP & Chief Accounting Officer | 1,033 0.0002% | $17.00 | $17,561 | -20.92% | |
| 2025-02-26 | Sale | Bramwell James | EVP Sales, Customer Excellence | 3,758 0.0006% | $17.53 | $65,878 | -24.19% | |
| 2025-02-26 | Sale | Eck Steven W | SVP & Chief Accounting Officer | 4,907 0.0007% | $17.53 | $86,020 | -24.19% | |
| 2024-09-05 | Sale | Eck Steven W | SVP & Chief Accounting Officer | 3,525 0.0005% | $25.06 | $88,337 | -35.55% | |
| 2024-07-31 | Sale | Couturier Christophe | EVP, AMEA | 100 <0.0001% | $28.00 | $2,800 | -22.39% | |
| 2024-07-30 | Sale | Couturier Christophe | EVP, AMEA | 10,000 0.0014% | $27.00 | $270,000 | -24.74% | |
| 2024-03-08 | Sale | Eck Steven W | SVP & Chief Accounting Officer | 3,685 0.0005% | $25.63 | $94,447 | -7.96% |
| MEHRA SANJEEV K | director | 350000 0.0513% | $4.26M | 1 | 0 | |
| SUMME GREGORY L | director | 300000 0.044% | $3.65M | 6 | 0 | |
| Ligner Emmanuel | President and CEO | 283424 0.0416% | $3.45M | 1 | 0 | |
| Peacock Jonathan M | director | 202715 0.0297% | $2.47M | 1 | 0 | |
| Bramwell James | EVP Sales, Customer Excellence | 86605 0.0127% | $1.05M | 0 | 9 | |
| Eck Steven W | SVP & Chief Accounting Officer | 55068 0.0081% | $669,626.88 | 0 | 7 | |
| Kang Lan | director | 35215 0.0052% | $428,214.40 | 1 | 0 | |
| Massaro Joseph R | director | 35038 0.0051% | $426,062.08 | 1 | 0 | |
| Connolly Thomas | 58881710 8.636% | $716M | 7 | 8 | +6.56% | |
| GOLDMAN SACHS & CO. LLC | 43483708 6.3776% | $528.76M | 17 | 19 | +37.47% | |
| New Mountain Investments III, LLC | 10 percent owner | 28000000 4.1067% | $340.48M | 0 | 4 | |
| GUPTA RAJIV | director | 879347 0.129% | $10.69M | 0 | 9 | |
| Natauri Jo | director | 557656 0.0818% | $6.78M | 18 | 20 | +35.53% |
| Stubblefield Michael | CEO | 429500 0.063% | $5.22M | 1 | 6 | +1.75% |
| Vanderhaegen Frederic | EVP, Americas and Europe | 160735 0.0236% | $1.95M | 0 | 6 | |
| Ohri Devashish | EVP, IMEA | 139095 0.0204% | $1.69M | 0 | 10 | |
| Wondrasch Michael | EVP & CIO | 113295 0.0166% | $1.38M | 0 | 4 | |
| Brophy Gerard | EVP, Biopharma Production | 108715 0.0159% | $1.32M | 0 | 16 | |
| Miller Justin | EVP & General Counsel | 86536 0.0127% | $1.05M | 0 | 3 | |
| Couturier Christophe | EVP, AMEA | 73930 0.0108% | $898,988.80 | 0 | 14 | |
| Szlosek Thomas A | EVP & CFO | 35668 0.0052% | $433,722.88 | 1 | 0 | +1.75% |
| Shaw Christi | director | 11319 0.0017% | $137,639.04 | 0 | 1 |
| Increased Positions | 217 | +32.49% | 96M | +13.23% |
| Decreased Positions | 312 | -46.71% | 131M | -18.08% |
| New Positions | 70 | New | 27M | New |
| Sold Out Positions | 107 | Sold Out | 25M | Sold Out |
| Total Postitions | 573 | -14.22% | 691M | -4.85% |
| Dodge & Cox | $1.35M | 17.27% | 117.75M | +313,404 | +0.27% | 2025-09-30 |
| Vanguard Group Inc | $756,234.00 | 9.68% | 65.99M | +1M | +1.75% | 2025-09-30 |
| Blackrock, Inc. | $695,817.00 | 8.9% | 60.72M | -11M | -15.56% | 2025-09-30 |
| Barrow Hanley Mewhinney & Strauss Llc | $395,922.00 | 5.07% | 34.55M | +3M | +10.76% | 2025-09-30 |
| T. Rowe Price Investment Management, Inc. | $377,351.00 | 4.83% | 32.93M | -24M | -41.72% | 2025-09-30 |
| State Street Corp | $233,392.00 | 2.99% | 20.37M | -3M | -13.28% | 2025-09-30 |
| Engine Capital Management, Lp | $225,996.00 | 2.89% | 19.72M | +14M | +258.27% | 2025-09-30 |
| Greenhaven Associates Inc | $209,851.00 | 2.69% | 18.31M | +18M | New | 2025-09-30 |
| Invesco Ltd. | $183,972.00 | 2.35% | 16.05M | +119,508 | +0.75% | 2025-09-30 |
| Clarkston Capital Partners, Llc | $172,133.00 | 2.2% | 15.02M | +1M | +7.42% | 2025-09-30 |