---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-287943"
form_type: "8-K"
ticker: "MKSI"
cik: "0001049502"
company_name: "MKS INC"
filed_at: "2023-12-04T23:59:59+00:00"
generated_at: "2026-06-07T18:32:13.633992+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# MKS Instruments CFO Seth Bagshaw to retire effective April 1, 2024

## Summary
- Seth H. Bagshaw, EVP, CFO and Treasurer, will retire April 1, 2024, after 18 years at MKS.
- He will serve as special advisor through May 1, 2024, to ensure a smooth transition.
- Company has retained an executive search firm to find his successor.
- Bagshaw has been CFO since 2010 and helped build MKS into a top-2 player in 20 product categories.

## SEC filing metadata
- accession: 0001193125-23-287943
- form_type: 8-K
- ticker: MKSI
- cik: 0001049502
- company_name: MKS INC
- filed_at: 2023-12-04T23:59:59+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/1049502/000119312523287943/0001193125-23-287943-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1049502/000119312523287943/d621921d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-287943
- JSON: https://secwatch.observer/filing/0001193125-23-287943.json
- Plain text: https://secwatch.observer/filing/0001193125-23-287943.txt

## Key facts
- Executive change
  Seth H. Bagshaw departed as Executive Vice President, Chief Financial Officer and Treasurer at MKS INC.
  - Action: retire
  - Role: Executive Vice President, Chief Financial Officer and Treasurer
  source text: On December 1, 2023, Seth H. Bagshaw, Executive Vice President, Chief Financial Officer and Treasurer of MKS Instruments, Inc. (the “Company”) notified the Company that he intends to retire as Executive Vice President, Chief Financial Officer and Treasurer of the Company effective April 1, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1049502/000119312523287943/0001193125-23-287943-index.htm

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