Thomas Samuel McClenahan - Mar 3, 2023 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: Mar 3, 2023
Transactions value $: -$486,723
Form type: 4
Date filed: 3/7/2023, 07:29 PM
Previous filing: Feb 24, 2022
Next filing: Mar 1, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASI	Common Stock	Award	$0	+5.02K	+14.85%	$0.00	38.8K	Mar 3, 2023	Direct	F1
transaction	MASI	Common Stock	Tax liability	-$487K	-2.67K	-6.88%	$182.43	36.1K	Mar 3, 2023	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	+8.8K		$0.00	8.8K	Mar 3, 2023	Common Stock	8.8K	$182.43	Direct	F3

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

Explanation of Responses:

Id	Content
F1	On March 12, 2020, the Reporting Person was granted performance restricted stock units which vested on March 3, 2023 based on the Issuer's achievement of certain FY2022 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 3, 2023 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.