---
schema_version: "secwatch.filing_event.v1"
accession: "0001722482-25-000087"
form_type: "8-K"
ticker: "AVTR"
cik: "0001722482"
company_name: "Avantor, Inc."
filed_at: "2025-04-28T23:59:59+00:00"
generated_at: "2026-05-23T05:04:39.452429+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Avantor CEO Michael Stubblefield to step down upon successor appointment

## Summary
- Stubblefield to step down as CEO and from board; will remain non-executive advisor until Feb 28, 2026.
- Transition agreement signed April 24; he continues in current role until successor named or End Date.
- Eligible for involuntary separation payments under existing employment agreement if employed through End Date.

## SEC filing metadata
- accession: 0001722482-25-000087
- form_type: 8-K
- ticker: AVTR
- cik: 0001722482
- company_name: Avantor, Inc.
- filed_at: 2025-04-28T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1722482/000172248225000087/0001722482-25-000087-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1722482/000172248225000087/avtr-20250424.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001722482-25-000087
- JSON: https://secwatch.observer/filing/0001722482-25-000087.json
- Plain text: https://secwatch.observer/filing/0001722482-25-000087.txt

## Key facts
- Executive change
  Michael Stubblefield departed as Director, President and Chief Executive Officer at Avantor, Inc..
  - Action: step down
  - Role: Director, President and Chief Executive Officer
  source text: Michael Stubblefield and Avantor, Inc. (the “Company”) agreed to initiate a leadership transition and Mr. Stubblefield agreed to step down from his role as Director, President and Chief Executive Officer of the Company, effective upon the appointment of his successor.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1722482/000172248225000087/0001722482-25-000087-index.htm

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