Michael Stubblefield
President & CEO at Avantor Inc.
Sits on 2 boards. Last updated September 28, 2026
Time on boards
- Boards served
- 2
- Current seats
- 2
- Board service
- 7 years
- Director since
- 2023
7 years of board service in total across 2 boards, counting each seat separately. Longest: Avantor Inc., 3 years.
Avantor Inc.
Director · President & CEO
Ingersoll Rand Inc.
Director
Chief executive roles
Avantor Inc.
· President & CEO
Dates unknown
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Feb 25, 2024 | Avantor Inc. | Shares withheld for tax | −7,685 | $24.35 | $187,130 |
| Feb 24, 2024 | Avantor Inc. | Shares withheld for tax | −9,595 | $24.35 | $233,638 |
| Feb 23, 2024 | Avantor Inc. | Grant or award | +107,802 | — | — |
| Feb 23, 2024 | Avantor Inc. | Shares withheld for tax | −7,422 | $24.35 | $180,726 |
| Feb 22, 2024 | Avantor Inc. | Grant or award | +99,075 | — | — |
| Feb 22, 2024 | Avantor Inc. | Shares withheld for tax | −41,177 | $24.59 | $1,012,542 |
| Feb 20, 2024 | Avantor Inc. | Shares withheld for tax | −9,711 | $24.05 | $233,550 |
| Aug 5, 2023 | Ingersoll Rand Inc. | Option exercise | +1,857 | — | — |
| May 26, 2023 | Avantor Inc. | Gift | −40,000 | — | — |
| May 26, 2023 | Avantor Inc. | Gift | +40,000 | — | — |
| May 17, 2023 | Avantor Inc. | Shares withheld for tax | −106,200 | $20.28 | $2,153,736 |
| Feb 25, 2023 | Avantor Inc. | Shares withheld for tax | −7,685 | $24.62 | $189,205 |
| Feb 24, 2023 | Avantor Inc. | Grant or award | +99,004 | — | — |
| Feb 23, 2023 | Avantor Inc. | Shares withheld for tax | −7,422 | $24.59 | $182,507 |
| Feb 20, 2023 | Avantor Inc. | Shares withheld for tax | −15,026 | $24.54 | $368,738 |
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