Michelle Brennan - Apr 29, 2025 Form 4 Insider Report for MASIMO CORP (MASI)

Role: Director, Chairman of the Board
Signature: /s/ Micah W. Young, Attorney-In-Fact
Stock symbol: MASI
Transactions as of: Apr 29, 2025
Transactions value $: $0
Form type: 4
Date filed: 8/11/2025, 07:51 PM
Previous filing: Feb 14, 2025
Next filing: Aug 14, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Brennan Michelle	Director, Chairman of the Board	C/O MASIMO CORPORATION, 52 DISCOVERY, IRVINE	/s/ Micah W. Young, Attorney-In-Fact	2025-08-11	0001827353

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	Award	$0	+766		$0.00	766	Apr 29, 2025	Common Stock	766		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	These RSUs were granted on April 29, 2025 and will vest in full on the earlier of the first anniversary of the grant date of the date of the next annual meeting of stockholders following the date of grant.