---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-028405"
form_type: "8-K"
ticker: "MKSI"
cik: "0001049502"
company_name: "MKS INC"
filed_at: "2024-02-08T23:59:59+00:00"
generated_at: "2026-06-06T05:13:40.697604+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# MKS Instruments appoints Michelle McCarthy as VP and Chief Accounting Officer effective March 4, 2024

## Summary
- Michelle McCarthy to replace Seth Bagshaw as principal accounting officer; Bagshaw remains CFO until retirement on April 1, 2024.
- McCarthy receives $400k base salary, 50% bonus target, $350k equity for 2024, plus $300k sign-on cash and $400k sign-on RSUs.
- Sign-on equity vests in three equal annual installments; grants expected April 15, 2024.
- McCarthy previously served as SVP & CAO at Mercury Systems and as Corporate Controller at Analog Devices.

## SEC filing metadata
- accession: 0001193125-24-028405
- form_type: 8-K
- ticker: MKSI
- cik: 0001049502
- company_name: MKS INC
- filed_at: 2024-02-08T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1049502/000119312524028405/0001193125-24-028405-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1049502/000119312524028405/d758144d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-028405
- JSON: https://secwatch.observer/filing/0001193125-24-028405.json
- Plain text: https://secwatch.observer/filing/0001193125-24-028405.txt

## Key facts
- Executive change
  Michelle M. McCarthy was appointed as Vice President and Chief Accounting Officer at MKS INC.
  - Action: appointed
  - Role: Vice President and Chief Accounting Officer
  source text: On February 5, 2024, the Board of Directors (the “Board”) of MKS Instruments, Inc. (the “Company”) appointed Michelle M. McCarthy to serve as Vice President and Chief Accounting Officer of the Company, effective March 4, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1049502/000119312524028405/0001193125-24-028405-index.htm
- Executive change
  Seth H. Bagshaw retired as Executive Vice President, Chief Financial Officer and Treasurer at MKS INC.
  - Action: retired
  - Role: Executive Vice President, Chief Financial Officer and Treasurer
  source text: Mr. Bagshaw will continue to serve as the principal financial officer of the Company until his previously announced retirement 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/1049502/000119312524028405/0001193125-24-028405-index.htm

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