<SEC-DOCUMENT>0000937556-23-000156-index.html : 20230620
<SEC-HEADER>0000937556-23-000156.hdr.sgml : 20230620
<ACCEPTANCE-DATETIME>20230620090227
ACCESSION NUMBER:		0000937556-23-000156
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		7
FILED AS OF DATE:		20230620
DATE AS OF CHANGE:		20230620

FILER:

	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:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33642
		FILM NUMBER:		231023664

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>masi-20230620axdefa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: masi-20230620axdefa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>masimologo300x1a05a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: masimologo300x1a05a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>shareholderletterp1a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: shareholderletterp1a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>shareholderletterp2a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: shareholderletterp2a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>shareholderletterp3a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: shareholderletterp3a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>shareholderletterp4a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: shareholderletterp4a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>shareholderletterp5a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: shareholderletterp5a.jpg

</DOCUMENT>
</SEC-DOCUMENT>