MASIMO CORP — Director's Dealing 2025

Apr 24, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2025-04-21

Reporting Person: Hellmann Elisabeth A (Chief Human Resources Officer)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-04-21	Non-Qualified Stock Option (Right to Buy)	$149.24	A	2873	Acquired	2035-04-21	Common Stock (2873)	Direct
2025-04-21	Restricted Stock Units	$	A	1340	Acquired	2035-04-21	Common Stock (1340)	Direct

Footnotes

F1: This option was granted on April 21, 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.

F2: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of the Issuer upon vesting of the RSU.

F3: This RSU award was granted on April 21, 2025 and will vest ratably over four years, with 25% of the award vesting on each anniversary of the grant date.