---
schema_version: "secwatch.filing_event.v1"
accession: "0000937556-24-000085"
form_type: "8-K"
ticker: "MASI"
cik: "0000937556"
company_name: "MASIMO CORP"
filed_at: "2024-09-25T23:59:59+00:00"
generated_at: "2026-05-31T01:58:35.902209+00:00"
event_type: "leadership"
sentiment: "negative"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Masimo CEO Joe Kiani resigns; Michelle Brennan named interim CEO; board elections tilt to Politan nominees

## Summary
- Joe Kiani resigned as CEO on Sept 19, 2024, and filed a California lawsuit claiming 'Good Reason' termination.
- Board appointed current director Michelle Brennan as interim CEO effective Sept 24; Korn Ferry hired for CEO search.
- Shareholders elected Politan nominees William Jellison and Darlene Solomon to the board; Joe Kiani and Christopher Chavez were not elected.
- Reaffirms non-GAAP guidance for Q3 2024 (provided Aug 6); strategic review of consumer businesses continues with Centerview, Morgan Stanley, Sullivan & Cromwell.
- Board committed to value-creation initiatives including a potential sale or spin-off of consumer audio and healthcare units.

## SEC filing metadata
- accession: 0000937556-24-000085
- form_type: 8-K
- ticker: MASI
- cik: 0000937556
- company_name: MASIMO CORP
- filed_at: 2024-09-25T23:59:59+00:00
- event_type: leadership
- sentiment: negative
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 2.02, 5.02, 5.07, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/937556/000093755624000085/0000937556-24-000085-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/937556/000093755624000085/masi-20240925.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000937556-24-000085
- JSON: https://secwatch.observer/filing/0000937556-24-000085.json
- Plain text: https://secwatch.observer/filing/0000937556-24-000085.txt

## Key facts
- Executive change
  Joe Kiani resigned as Chief Executive Officer at MASIMO CORP.
  - Action: resigned
  - Role: Chief Executive Officer
  source text: The same day, Mr. Joe Kiani delivered a notification (the “ Notice ”) to the Board of Directors (the “ Board ”) of the Company stating his decision to resign from his position of Chief Executive Officer of the Company.
  evidence_url: https://www.sec.gov/Archives/edgar/data/937556/000093755624000085/0000937556-24-000085-index.htm
- Executive change
  Michelle Brennan was appointed as interim chief executive officer at MASIMO CORP.
  - Action: appointed
  - Role: interim chief executive officer
  source text: On September 24, 2024, the Board appointed Board member Michelle Brennan to serve as the Company’s interim chief executive officer (“ Interim CEO ”) effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/937556/000093755624000085/0000937556-24-000085-index.htm

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