    <SEC-DOCUMENT>0000937556-19-000019-index.html : 20190109
    <SEC-HEADER>0000937556-19-000019.hdr.sgml : 20190109
    <ACCEPTANCE-DATETIME>20190109084044
    ACCESSION NUMBER:		0000937556-19-000019
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		41
    CONFORMED PERIOD OF REPORT:	20190109
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20190109
    DATE AS OF CHANGE:		20190109

    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:			1229

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33642
    		FILM NUMBER:		19517363

    	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>8-K
    <SEQUENCE>1
    <FILENAME>masi-20190109x8k.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: masi-20190109x8k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>masi-20190109xex991.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 2 - file: masi-20190109xex991.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>masimoinvestorpres-v13.htm
    <DESCRIPTION>EXHIBIT 99.2
    <TEXT>
    Document 3 - file: masimoinvestorpres-v13.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>masimoinvestorpres-v13001.jpg
    <TEXT>
    Document 4 - file: masimoinvestorpres-v13001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>masimoinvestorpres-v13002.jpg
    <TEXT>
    Document 5 - file: masimoinvestorpres-v13002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>masimoinvestorpres-v13003.jpg
    <TEXT>
    Document 6 - file: masimoinvestorpres-v13003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>masimoinvestorpres-v13004.jpg
    <TEXT>
    Document 7 - file: masimoinvestorpres-v13004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>masimoinvestorpres-v13005.jpg
    <TEXT>
    Document 8 - file: masimoinvestorpres-v13005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>masimoinvestorpres-v13006.jpg
    <TEXT>
    Document 9 - file: masimoinvestorpres-v13006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>masimoinvestorpres-v13007.jpg
    <TEXT>
    Document 10 - file: masimoinvestorpres-v13007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>masimoinvestorpres-v13008.jpg
    <TEXT>
    Document 11 - file: masimoinvestorpres-v13008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>masimoinvestorpres-v13009.jpg
    <TEXT>
    Document 12 - file: masimoinvestorpres-v13009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>masimoinvestorpres-v13010.jpg
    <TEXT>
    Document 13 - file: masimoinvestorpres-v13010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>masimoinvestorpres-v13011.jpg
    <TEXT>
    Document 14 - file: masimoinvestorpres-v13011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>masimoinvestorpres-v13012.jpg
    <TEXT>
    Document 15 - file: masimoinvestorpres-v13012.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>masimoinvestorpres-v13013.jpg
    <TEXT>
    Document 16 - file: masimoinvestorpres-v13013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>masimoinvestorpres-v13014.jpg
    <TEXT>
    Document 17 - file: masimoinvestorpres-v13014.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>masimoinvestorpres-v13015.jpg
    <TEXT>
    Document 18 - file: masimoinvestorpres-v13015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>masimoinvestorpres-v13016.jpg
    <TEXT>
    Document 19 - file: masimoinvestorpres-v13016.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>masimoinvestorpres-v13017.jpg
    <TEXT>
    Document 20 - file: masimoinvestorpres-v13017.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>masimoinvestorpres-v13018.jpg
    <TEXT>
    Document 21 - file: masimoinvestorpres-v13018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>masimoinvestorpres-v13019.jpg
    <TEXT>
    Document 22 - file: masimoinvestorpres-v13019.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>masimoinvestorpres-v13020.jpg
    <TEXT>
    Document 23 - file: masimoinvestorpres-v13020.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>masimoinvestorpres-v13021.jpg
    <TEXT>
    Document 24 - file: masimoinvestorpres-v13021.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>masimoinvestorpres-v13022.jpg
    <TEXT>
    Document 25 - file: masimoinvestorpres-v13022.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>masimoinvestorpres-v13023.jpg
    <TEXT>
    Document 26 - file: masimoinvestorpres-v13023.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>masimoinvestorpres-v13024.jpg
    <TEXT>
    Document 27 - file: masimoinvestorpres-v13024.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>masimoinvestorpres-v13025.jpg
    <TEXT>
    Document 28 - file: masimoinvestorpres-v13025.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>masimoinvestorpres-v13026.jpg
    <TEXT>
    Document 29 - file: masimoinvestorpres-v13026.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>masimoinvestorpres-v13027.jpg
    <TEXT>
    Document 30 - file: masimoinvestorpres-v13027.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>masimoinvestorpres-v13028.jpg
    <TEXT>
    Document 31 - file: masimoinvestorpres-v13028.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>masimoinvestorpres-v13029.jpg
    <TEXT>
    Document 32 - file: masimoinvestorpres-v13029.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>masimoinvestorpres-v13030.jpg
    <TEXT>
    Document 33 - file: masimoinvestorpres-v13030.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>masimoinvestorpres-v13031.jpg
    <TEXT>
    Document 34 - file: masimoinvestorpres-v13031.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>masimoinvestorpres-v13032.jpg
    <TEXT>
    Document 35 - file: masimoinvestorpres-v13032.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>masimoinvestorpres-v13033.jpg
    <TEXT>
    Document 36 - file: masimoinvestorpres-v13033.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>37
    <FILENAME>masimoinvestorpres-v13034.jpg
    <TEXT>
    Document 37 - file: masimoinvestorpres-v13034.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>38
    <FILENAME>masimoinvestorpres-v13035.jpg
    <TEXT>
    Document 38 - file: masimoinvestorpres-v13035.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>39
    <FILENAME>masimoinvestorpres-v13036.jpg
    <TEXT>
    Document 39 - file: masimoinvestorpres-v13036.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>40
    <FILENAME>masimologopressreleaseq416.jpg
    <TEXT>
    Document 40 - file: masimologopressreleaseq416.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>41
    <FILENAME>masimologoq12019b.jpg
    <TEXT>
    Document 41 - file: masimologoq12019b.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>