---
schema_version: "secwatch.filing_event.v1"
accession: "0000937556-25-000022"
form_type: "8-K"
ticker: "MASI"
cik: "0000937556"
company_name: "MASIMO CORP"
filed_at: "2025-02-19T23:59:59+00:00"
generated_at: "2026-05-26T12:59:05.441895+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# Masimo amends bylaws; reduces special meeting threshold to 20%, sets April 29 annual meeting

## Summary
- Board approved Restated Bylaws; stockholders with 20% voting power can call special meetings.
- Vote required for stockholder-approved bylaw amendments reduced from 75% to majority of voting power.
- Advance notice period for nominations extended to 90-120 days before prior year's proxy mailing.
- 2025 Annual Meeting scheduled for April 29, 2025; proposals/nominations due March 1, 2025.
- Proxy access nominations also due March 1, 2025; universal proxy rules compliance deadline same date.

## SEC filing metadata
- accession: 0000937556-25-000022
- form_type: 8-K
- ticker: MASI
- cik: 0000937556
- company_name: MASIMO CORP
- filed_at: 2025-02-19T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 5.02, 5.08, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/937556/000093755625000022/0000937556-25-000022-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/937556/000093755625000022/masi-20250212.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000937556-25-000022
- JSON: https://secwatch.observer/filing/0000937556-25-000022.json
- Plain text: https://secwatch.observer/filing/0000937556-25-000022.txt

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