Thomas Samuel McClenahan - Jan 2, 2022 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: Jan 2, 2022
Transactions value $: -$317,374
Form type: 4
Date filed: 1/4/2022, 03:52 PM
Previous filing: May 13, 2021
Next filing: Feb 16, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASI	Common Stock	Options Exercise	$0	+2K	+8.49%	$0.00	25.6K	Jan 2, 2022	Direct
transaction	MASI	Common Stock	Tax liability	-$317K	-1.08K	-4.24%	$292.78	24.5K	Jan 2, 2022	Direct

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	-2K	-50%	$0.00	2K	Jan 2, 2022	Common Stock	2K		Direct	F1, F2

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

Explanation of Responses:

Id	Content
F1	Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of the Issuer upon vesting of the RSU.
F2	On February 27, 2018, the Reporting Person was granted 10,000 restricted stock units, 20% of which were vested upon grant and 20% of which will vest on the first business day of each fiscal year thereafter.