Thomas Samuel McClenahan - Feb 28, 2024 Form 4 Insider Report for MASIMO CORP (MASI)

Role: EVP, GEN COUNSEL & CORP SEC
Signature: /s/ Micah Young, Attorney-In-Fact
Stock symbol: MASI
Transactions as of: Feb 28, 2024
Transactions value $: -$50,708
Form type: 4
Date filed: 3/1/2024, 09:16 PM
Previous filing: Mar 7, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASI	Common Stock	Award	$0	+1K	+2.78%	$0.00	37.1K	Feb 28, 2024	Direct	F1
transaction	MASI	Common Stock	Tax liability	-$50.7K	-394	-1.06%	$128.70	36.7K	Feb 28, 2024	Direct	F2

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	Non-Qualified Stock Option (Right to Buy)	Award	$0	+12K		$0.00	12K	Mar 1, 2024	Common Stock	12K	$126.49	Direct	F3
transaction	MASI	Restricted Stock Units	Award	$0	+30K		$0.00	30K	Mar 1, 2024	Common Stock	30K		Direct	F4, F5

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

Explanation of Responses:

Id	Content
F1	On February 26, 2021, the Reporting Person was granted performance restricted stock units which vested on February 28, 2024 based on the Issuer's achievement of certain FY2023 pre-established performance objectives.
F2	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.
F3	This option was granted on March 1, 2024 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.
F4	Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of the Issuer upon vesting of the RSU.
F5	On March 1, 2024, the Reporting Person was granted 30,000 restricted stock units, 50% of which will vest on March 1, 2025 and 50% of which will vest on March 1, 2026.