MASIMO CORP — Director's Dealing 2026

Feb 13, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASIMO CORP (MASI)
CIK: 0000937556
Period of Report: 2026-02-12

Reporting Person: Szyman Catherine M. (Director, CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-12	Common Stock	M	11141	$132.96	Acquired	11141	Direct
2026-02-12	Common Stock	F	4568	—	Disposed	6573	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-12	Restricted Stock Units	$	M	11141	Disposed	2035-02-12	Common Stock (11141)	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 performance 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: As previously reported, the reporting person was granted 33,424 RSUs on February 12, 2025 and will vest ratably over three years. One-third of the RSUs vested on February 12, 2026, and the remaining RSUs will vest in two equal installments on the second and third anniversaries of the grant date.