William R. Jellison - Aug 11, 2025 Form 4 Insider Report for MASIMO CORP (MASI)

Role: Director
Signature: /s/ Micah W. Young, Attorney-In-Fact
Stock symbol: MASI
Transactions as of: Aug 11, 2025
Transactions value $: $437,940
Form type: 4
Date filed: 8/12/2025, 04:20 PM
Previous filing: Jul 2, 2025
Next filing: Aug 19, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Jellison William R	Director	C/O MASIMO CORPORATION, 52 DISCOVERY, IRVINE	/s/ Micah W. Young, Attorney-In-Fact	2025-08-12	0001189883

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASI	Common Stock	Purchase	$438K	+3K	+167.6%	$145.98	4.79K	Aug 11, 2025	Direct	F1

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

Explanation of Responses:

Id	Content
F1	The price reported in Column 4 represents the weighted average price per share of open market purchase transactions. The actual purchase prices ranged from a low of $145.84 per share to a high of $146.00 per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

Content

The price reported in Column 4 represents the weighted average price per share of open market purchase transactions. The actual purchase prices ranged from a low of $145.84 per share to a high of $146.00 per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.