Avantor chairman Jonathan Peacock to step down from board December 31, 2025
Avantor said Chairman Jonathan Peacock will step down as chairman and from the Board and Nominating and Governance Committee on December 31, 2025, and that he did not resign over any disagreement with the company. Board member Gregory L. Summe will become chairman on January 1, 2026, a planned leadership transition rather than a change in reported results.
Key points
- Jonathan Peacock informed Avantor on October 10, 2025 of his decision to step down.
- Peacock's last day as chairman and director is expected to be December 31, 2025.
- Gregory L. Summe, a current Board member, will serve as chairman from January 1, 2026.
- The filing states the departure was not due to any disagreement on operations, policies or practices.
The filing
Written by AI (Anthropic Claude, claude-haiku-5-5) on Nov 8, 2026, 12:56 AM ET, from the text of the filing and its press-release exhibits only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on October 14, 2025.
Briefs are written by AI from the filing text (each brief's own page names the model) and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the model's reading of the filing for shareholders, not a price forecast. Not investment advice.