    <SEC-DOCUMENT>0001104659-23-062218-index.html : 20230518
    <SEC-HEADER>0001104659-23-062218.hdr.sgml : 20230518
    <ACCEPTANCE-DATETIME>20230518150411
    ACCESSION NUMBER:		0001104659-23-062218
    CONFORMED SUBMISSION TYPE:	DFAN14A
    PUBLIC DOCUMENT COUNT:		9
    FILED AS OF DATE:		20230518
    DATE AS OF CHANGE:		20230518

    SUBJECT COMPANY:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MASIMO CORP
    		CENTRAL INDEX KEY:			0000937556
    		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS [3845]
    		IRS NUMBER:				330368882
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DFAN14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33642
    		FILM NUMBER:		23935683

    	BUSINESS ADDRESS:
    		STREET 1:		52 DISCOVERY
    		CITY:			IRVINE
    		STATE:			CA
    		ZIP:			92618
    		BUSINESS PHONE:		949-297-7000

    	MAIL ADDRESS:
    		STREET 1:		52 DISCOVERY
    		CITY:			IRVINE
    		STATE:			CA
    		ZIP:			92618

    FILED BY:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Politan Capital Management LP
    		CENTRAL INDEX KEY:			0001885245
    		IRS NUMBER:				871666292
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DFAN14A

    	BUSINESS ADDRESS:
    		STREET 1:		106 WEST 56TH STREET
    		STREET 2:		10TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10019
    		BUSINESS PHONE:		(212) 756-2000

    	MAIL ADDRESS:
    		STREET 1:		106 WEST 56TH STREET
    		STREET 2:		10TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10019
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DFAN14A
    <SEQUENCE>1
    <FILENAME>tm2316242d1_dfan14a.htm
    <DESCRIPTION>DFAN14A
    <TEXT>
    Document 1 - file: tm2316242d1_dfan14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>tm2316242d1_dfan14aimg01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: tm2316242d1_dfan14aimg01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tm2316242d1_dfan14aimg02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm2316242d1_dfan14aimg02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>tm2316242d1_dfan14aimg03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: tm2316242d1_dfan14aimg03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>tm2316242d1_dfan14aimg04.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: tm2316242d1_dfan14aimg04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>tm2316242d1_dfan14aimg05.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: tm2316242d1_dfan14aimg05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>tm2316242d1_dfan14aimg06.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: tm2316242d1_dfan14aimg06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>tm2316242d1_dfan14aimg07.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: tm2316242d1_dfan14aimg07.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>tm2316242d1_dfan14aimg08.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: tm2316242d1_dfan14aimg08.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>