---
schema_version: "secwatch.filing_event.v1"
accession: "0000937556-25-000007"
form_type: "8-K"
ticker: "MASI"
cik: "0000937556"
company_name: "MASIMO CORP"
filed_at: "2025-01-21T23:59:59+00:00"
generated_at: "2026-05-27T22:51:45.281731+00:00"
event_type: "leadership"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Masimo appoints Catherine Szyman as CEO, effective Feb 12; Michelle Brennan becomes Chairman

## Summary
- Katie Szyman appointed CEO effective Feb 12; previously led Edwards Critical Care (acquired by BD); 35+ yrs experience.
- Interim CEO Michelle Brennan becomes Chairman; Lead Independent Director Quentin Koffey becomes Vice Chairman.
- Szyman compensation: $1M base salary, 100% target bonus, $7M annual LTI target; one-time buyout equity valued at $10M total.
- Board continues strategic review of consumer audio and healthcare businesses, with Centerview, Morgan Stanley, Sullivan & Cromwell as advisors.

## SEC filing metadata
- accession: 0000937556-25-000007
- form_type: 8-K
- ticker: MASI
- cik: 0000937556
- company_name: MASIMO CORP
- filed_at: 2025-01-21T23:59:59+00:00
- event_type: leadership
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/937556/000093755625000007/0000937556-25-000007-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/937556/000093755625000007/masi-20250117.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000937556-25-000007
- JSON: https://secwatch.observer/filing/0000937556-25-000007.json
- Plain text: https://secwatch.observer/filing/0000937556-25-000007.txt

## Key facts
- Executive change
  Michelle Brennan was appointed as Chairman of the Board at MASIMO CORP.
  - Action: appointed
  - Role: Chairman of the Board
  source text: has been appointed to the role of Chairman of the Board
  evidence_url: https://www.sec.gov/Archives/edgar/data/937556/000093755625000007/0000937556-25-000007-index.htm
- Executive change
  Michelle Brennan departed as Interim Chief Executive Officer at MASIMO CORP.
  - Action: ceased
  - Role: Interim Chief Executive Officer
  source text: Michelle Brennan will cease to serve as Interim Chief Executive Officer of the Company
  evidence_url: https://www.sec.gov/Archives/edgar/data/937556/000093755625000007/0000937556-25-000007-index.htm
- Executive change
  Catherine Szyman was appointed as Chief Executive Officer at MASIMO CORP.
  - Action: appointed
  - Role: Chief Executive Officer
  source text: appointed Catherine Szyman, 58, as Chief Executive Officer of the Company, effective as of February 12, 2025
  evidence_url: https://www.sec.gov/Archives/edgar/data/937556/000093755625000007/0000937556-25-000007-index.htm
- Executive change
  Quentin Koffey was appointed as Vice-Chairman of the Board at MASIMO CORP.
  - Action: appointed
  - Role: Vice-Chairman of the Board
  source text: Quentin Koffey will serve in the role of Vice-Chairman of the Board
  evidence_url: https://www.sec.gov/Archives/edgar/data/937556/000093755625000007/0000937556-25-000007-index.htm

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