MASIMO CORP — Director's Dealing 2025

Sep 3, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2025-08-18

Reporting Person: Dadswell Charles (Director)

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Restricted Stock Units	$	2035-08-18	Common Stock (2273)	0	Direct
Non-Qualified Stock Option (Right to Buy)	$153.93	2035-08-18	Common Stock (5104)	0	Direct

Footnotes

F1: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of the Issuer upon vesting of the RSU.

F2: This RSU award was granted on August 18, 2025 and will vest ratably over four years, with 25% of the award vesting on each anniversary of the grant date.

F3: This option was granted on August 18, 2025 and is exercisable as the option vests. The option vests over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date.