Michelle Brennan - 12 Feb 2025 Form 4 Insider Report for MASIMO CORP (MASI)

Role: Interim CEO, Director
Signature: /s/ Micah W. Young, Attorney-In-Fact
Issuer symbol: MASI
Transactions as of: 12 Feb 2025
Net transactions value: -$864,520
Form type: 4
Filing time: 14 Feb 2025, 17:21:10 UTC
Previous filing: 13 Nov 2024
Next filing: 01 May 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASI	Common Stock	Award	$0	+8,916	+726%	$0.000000	10,144	12 Feb 2025	Direct
transaction	MASI	Common Stock	Tax liability	$864,520	-4,816	-47%	$179.51	5,328	12 Feb 2025	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MASI	Restricted Stock Units	Options Exercise	$0	-8,916	-100%	$0.000000	0	12 Feb 2025	Common Stock	8,916		Direct	F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
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	On October 31, 2024, the Reporting Person was granted 8,916 restricted stock units. 100% of the restricted stock units vested in full upon the appointment of a new Chief Executive Officer of the Company.