---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-144194"
form_type: "8-K"
ticker: "AVTR"
cik: "0001722482"
company_name: "Avantor, Inc."
filed_at: "2023-05-15T23:59:59+00:00"
generated_at: "2026-06-15T01:19:16.971666+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Avantor CFO Thomas Szlosek to depart Aug 2, 2023; FY2023 guidance reaffirmed

## Summary
- CFO Thomas Szlosek resigns effective August 2, 2023 to join a company outside life sciences.
- Szlosek's departure is not due to any disagreement with Avantor's operations, policies, or practices.
- Avantor has initiated a search for a new CFO; Szlosek will remain through Q2 earnings announcement.
- Company reaffirms fiscal 2023 financial guidance provided on April 28, 2023.

## SEC filing metadata
- accession: 0001193125-23-144194
- form_type: 8-K
- ticker: AVTR
- cik: 0001722482
- company_name: Avantor, Inc.
- filed_at: 2023-05-15T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1722482/000119312523144194/0001193125-23-144194-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1722482/000119312523144194/d478163d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-144194
- JSON: https://secwatch.observer/filing/0001193125-23-144194.json
- Plain text: https://secwatch.observer/filing/0001193125-23-144194.txt

## Key facts
- Executive change
  Thomas A. Szlosek resigned as Executive Vice President and Chief Financial Officer at Avantor, Inc..
  - Action: resigned
  - Role: Executive Vice President and Chief Financial Officer
  source text: On May 9, 2023, Mr. Thomas A. Szlosek notified the Company of his decision to resign as the Company’s Executive Vice President and Chief Financial Officer (“CFO”), effective as of August 2, 2023, to join a company outside the life sciences industry.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1722482/000119312523144194/0001193125-23-144194-index.htm

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