MASIMO CORP — Director's Dealing 2025

May 2, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2025-04-29

Reporting Person: LANE WENDY E (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-04-29	Common Stock	M	1383	—	Acquired	1383	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-04-29	Restricted Stock Units	$	M	1383	Disposed	2034-10-16	Common Stock (1383)	Direct
2025-04-29	Restricted Stock Units	$	A	1225	Acquired	2035-04-29	Common Stock (1225)	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: These RSUs were granted on October 16, 2024 and vested in full on the date of the next annual meeting of stockholders following the date of grant.

F3: These RSUs were granted on April 29, 2025 and will vest in full on the earlier of the first anniversary of the grant date or the date of the next annual meeting of stockholders following the date of grant.