MASIMO CORP — Director's Dealing 2026

Feb 26, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2026-02-26

Reporting Person: Young Micah W (EVP & Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-26	Common Stock	A	2034	—	Acquired	19470	Direct
2026-02-26	Common Stock	F	1123	$175.22	Disposed	18347	Direct

Footnotes

F1: On March 3, 2023, the Reporting Person was granted performance-based restricted stock units ("PSUs"), which vested on February 26, 2026 upon the Issuer's achievement of certain pre-established performance goals for the three-year performance period ended January 3, 2026.

F2: These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of shares upon the vesting of certain PSUs.