MASIMO CORP — Director's Dealing 2025

Nov 18, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2025-11-13

Reporting Person: Ahmed Omar (CTIO & EVP of Engineering)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-13	Common Stock	M	2474	$152.43	Acquired	4242	Direct
2025-11-13	Common Stock	F	974	—	Disposed	3268	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-11-13	Restricted Stock Units	$	M	2474	Disposed	2034-11-13	Common Stock (2474)	Direct

Footnotes

F1: 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 restricted stock units.

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 November 13, 2024 and vested in full on November 13, 2025.