---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-22-123673"
form_type: "8-K"
ticker: "MASI"
cik: "0000937556"
company_name: "MASIMO CORP"
filed_at: "2022-12-01T23:59:59+00:00"
generated_at: "2026-06-21T11:23:14.507261+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Masimo amends bylaws, sets stockholder notice period for 2023 annual meeting March 24-April 24

## Summary
- Board adopted amended & restated bylaws on Dec 1, 2022 with clarifications on stockholder nominations.
- Notice period for 2023 annual meeting runs March 24 - April 24, 2023, closing at 6 p.m. ET.
- Clarified that hedge funds are not subject to 'Related Person' disclosure; funding arrangements for proxy solicitation now explicitly covered.
- Nominating stockholders must disclose if they have plans for director nominations at other public companies, including competitors or litigation counterparties.

## SEC filing metadata
- accession: 0001104659-22-123673
- form_type: 8-K
- ticker: MASI
- cik: 0000937556
- company_name: MASIMO CORP
- filed_at: 2022-12-01T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/937556/000110465922123673/0001104659-22-123673-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/937556/000110465922123673/tm2231770d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-22-123673
- JSON: https://secwatch.observer/filing/0001104659-22-123673.json
- Plain text: https://secwatch.observer/filing/0001104659-22-123673.txt

## Key facts
- Governance Changes
  MASIMO CORP: Amended and restated bylaws to change stockholder notice period for 2023 annual meeting and make clarifications/modifications (effective 2022-12-01).
  - Change: bylaw amendment
  - Effective: 2022-12-01
  source text: approved and adopted amended and restated bylaws (the “Amended and Restated Bylaws”) to provide that the period for stockholders to give notice
  evidence_url: https://www.sec.gov/Archives/edgar/data/937556/000110465922123673/0001104659-22-123673-index.htm

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