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
- 8 years
- Director since
- 2023
8 years of board service in total across 2 boards, counting each seat separately. Longest: Avantor Inc., 3 years.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
Avantor Inc. May 8, 202588.4%
-
Avantor Inc. May 9, 202499.3%
-
Ingersoll Rand Inc. June 15, 202399.0%
-
Avantor Inc. May 11, 202399.3%
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 |
|---|---|---|---|---|---|
| May 21, 2025 | Avantor Inc. | Gift | −76,000 | — | — |
| May 21, 2025 | Avantor Inc. | Gift | +76,000 | — | — |
| Feb 25, 2025 | Avantor Inc. | Shares withheld for tax | −4,969 | $17.56 | $87,256 |
| Feb 24, 2025 | Avantor Inc. | Shares withheld for tax | −6,800 | $17.47 | $118,796 |
| Feb 23, 2025 | Avantor Inc. | Shares withheld for tax | −14,674 | $17.30 | $253,860 |
| Feb 20, 2025 | Avantor Inc. | Grant or award | +157,232 | — | — |
| 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 | — | — |
Questions about Michael Stubblefield
What boards is Michael Stubblefield on?
Michael Stubblefield sits on the boards of Avantor Inc. and Ingersoll Rand Inc.
Has Michael Stubblefield been a CEO?
Yes — Michael Stubblefield was CEO of Avantor Inc. (Until August 2025).
How long has Michael Stubblefield served on boards?
Our records show at least 8 years of board service across 2 boards, the earliest from 2023.
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