<SEC-DOCUMENT>0000937556-19-000128-index.html : 20190625
<SEC-HEADER>0000937556-19-000128.hdr.sgml : 20190625
<ACCEPTANCE-DATETIME>20190625164804
ACCESSION NUMBER:		0000937556-19-000128
CONFORMED SUBMISSION TYPE:	11-K
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20181231
FILED AS OF DATE:		20190625
DATE AS OF CHANGE:		20190625

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:			1228

	FILING VALUES:
		FORM TYPE:		11-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33642
		FILM NUMBER:		19919118

	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>11-K
<SEQUENCE>1
<FILENAME>masi-20190625x11k.htm
<DESCRIPTION>11-K
<TEXT>
Document 1 - file: masi-20190625x11k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>2
<FILENAME>masi-20190625xexx231.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
Document 2 - file: masi-20190625xexx231.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>image1.jpg
<TEXT>
Document 3 - file: image1.jpg

</DOCUMENT>
</SEC-DOCUMENT>