---
schema_version: "secwatch.filing_event.v1"
accession: "0000937556-25-000009"
form_type: "8-K"
ticker: "MASI"
cik: "0000937556"
company_name: "MASIMO CORP"
filed_at: "2025-01-31T23:59:59+00:00"
generated_at: "2026-05-27T05:03:24.558225+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Director Robert Chapek resigns from Masimo board effective at 2025 annual meeting

## Summary
- Robert Chapek voluntarily resigned as director, effective at the 2025 annual meeting (date TBD).
- Chapek served on board since January 2024 and is a member of Audit Committee.
- Resignation not due to any disagreement with company's operations, policies, or practices.
- No replacement announced; Chapek will continue in roles until effective date.

## SEC filing metadata
- accession: 0000937556-25-000009
- form_type: 8-K
- ticker: MASI
- cik: 0000937556
- company_name: MASIMO CORP
- filed_at: 2025-01-31T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/937556/000093755625000009/0000937556-25-000009-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/937556/000093755625000009/masi-20250130.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000937556-25-000009
- JSON: https://secwatch.observer/filing/0000937556-25-000009.json
- Plain text: https://secwatch.observer/filing/0000937556-25-000009.txt

## Key facts
- Executive change
  Robert Chapek resigned as Director at MASIMO CORP.
  - Action: resigned
  - Role: Director
  source text: On January 30, 2025, Robert Chapek notified the Board of Directors (the “Board”) of Masimo Corporation (“Masimo”) of his irrevocable resignation from the Board and all committees thereof, effective as of the date of the 2025 annual meeting of Masimo, which date the Board has not determined at this time.
  evidence_url: https://www.sec.gov/Archives/edgar/data/937556/000093755625000009/0000937556-25-000009-index.htm

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