---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-25-044871"
form_type: "8-K"
ticker: "AVTR"
cik: "0001722482"
company_name: "Avantor, Inc."
filed_at: "2025-10-14T23:59:59+00:00"
generated_at: "2026-05-17T03:55:14.572650+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Avantor chairman Jonathan Peacock to step down Dec 31, 2025; Gregory Summe to succeed

## Summary
- Jonathan Peacock informed Avantor he will step down as chairman and board member effective December 31, 2025.
- Peacock's departure is not due to any disagreement with the company's operations, policies or practices.
- Current board member Gregory L. Summe will serve as chairman from January 1, 2026.

## SEC filing metadata
- accession: 0001628280-25-044871
- form_type: 8-K
- ticker: AVTR
- cik: 0001722482
- company_name: Avantor, Inc.
- filed_at: 2025-10-14T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1722482/000162828025044871/0001628280-25-044871-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1722482/000162828025044871/avtr-20251010.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-25-044871
- JSON: https://secwatch.observer/filing/0001628280-25-044871.json
- Plain text: https://secwatch.observer/filing/0001628280-25-044871.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.