---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-047839"
form_type: "8-K"
ticker: "MASI"
cik: "0000937556"
company_name: "MASIMO CORP"
filed_at: "2026-04-23T23:59:59+00:00"
generated_at: "2026-05-15T04:46:57.930107+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Masimo provides supplemental proxy disclosures amid three stockholder lawsuits over Danaher merger

## Summary
- Three stockholder lawsuits filed in NY and CA allege Masimo's proxy statement is incomplete; company denies merit.
- Masimo voluntarily supplements proxy with details on sale process, including Danaher’s final $180/share offer and Party F’s $186/share bid.
- Centerview fairness opinion: DCF range $165–$212/share; precedent transaction range $122–$186/share; net debt $372M.
- Special meeting remains May 1, 2026; Board continues recommending vote FOR the Danaher merger at $180/share.
- Supplemental disclosures do not change merger consideration, timing, or the Board’s recommendation.

## SEC filing metadata
- accession: 0001104659-26-047839
- form_type: 8-K
- ticker: MASI
- cik: 0000937556
- company_name: MASIMO CORP
- filed_at: 2026-04-23T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/937556/000110465926047839/0001104659-26-047839-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/937556/000110465926047839/tm2612557d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-047839
- JSON: https://secwatch.observer/filing/0001104659-26-047839.json
- Plain text: https://secwatch.observer/filing/0001104659-26-047839.txt

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