Elisabeth A. Hellmann - 06 Mar 2026 Form 4 Insider Report for MASIMO CORP (MASI)

Role: Chief Human Resources Officer
Signature: /s/ Micah W. Young, Attorney-In-Fact
Issuer symbol: MASI
Transactions as of: 06 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 10 Mar 2026, 19:05:12 UTC
Previous filing: 23 Apr 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Hellmann Elisabeth A	Chief Human Resources Officer	C/O MASIMO CORPORATION, 52 DISCOVERY, IRVINE	/s/ Micah W. Young, Attorney-In-Fact	10 Mar 2026	0001870256

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		+5,985		$0.000000^*	5,985	06 Mar 2026	Common Stock	5,985		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	This RSU award was granted on March 6, 2026 and will vest ratably over four years, with 25% of the award vesting on each anniversary of the grant date.