    <SEC-DOCUMENT>0000937556-20-000088-index.html : 20200416
    <SEC-HEADER>0000937556-20-000088.hdr.sgml : 20200416
    <ACCEPTANCE-DATETIME>20200415210443
    ACCESSION NUMBER:		0000937556-20-000088
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		78
    CONFORMED PERIOD OF REPORT:	20191228
    FILED AS OF DATE:		20200416
    DATE AS OF CHANGE:		20200415
    EFFECTIVENESS DATE:		20200416

    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:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33642
    		FILM NUMBER:		20794917

    	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>DEF 14A
    <SEQUENCE>1
    <FILENAME>masi-20200415xdef14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: masi-20200415xdef14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>a5yearperformancev3.jpg
    <TEXT>
    Document 2 - file: a5yearperformancev3.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>a2019performancehighlightsv4.jpg
    <TEXT>
    Document 3 - file: a2019performancehighlightsv4.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>adammikkelsonbiophotov3.jpg
    <TEXT>
    Document 4 - file: adammikkelsonbiophotov3.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>annualincentivepiea05.jpg
    <TEXT>
    Document 5 - file: annualincentivepiea05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>annualmtginfoa05.jpg
    <TEXT>
    Document 6 - file: annualmtginfoa05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>asampath2018.jpg
    <TEXT>
    Document 7 - file: asampath2018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>barcodex2a05.jpg
    <TEXT>
    Document 8 - file: barcodex2a05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>barcodex5a05.jpg
    <TEXT>
    Document 9 - file: barcodex5a05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>basesalarypiea01.jpg
    <TEXT>
    Document 10 - file: basesalarypiea01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>bmuhsin2018.jpg
    <TEXT>
    Document 11 - file: bmuhsin2018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>boardoversightv2.jpg
    <TEXT>
    Document 12 - file: boardoversightv2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>businesshighlightsv4.jpg
    <TEXT>
    Document 13 - file: businesshighlightsv4.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>calculatora11.jpg
    <TEXT>
    Document 14 - file: calculatora11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>cashflowa1a01.jpg
    <TEXT>
    Document 15 - file: cashflowa1a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>charitableoutreachv4a01.jpg
    <TEXT>
    Document 16 - file: charitableoutreachv4a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>chart-0f413eb2dcbadb2b814a40.jpg
    <TEXT>
    Document 17 - file: chart-0f413eb2dcbadb2b814a40.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>chart-1ee8a99a2b61632c372a41.jpg
    <TEXT>
    Document 18 - file: chart-1ee8a99a2b61632c372a41.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>chart-7f0bc848f94c5ab5b5da39.jpg
    <TEXT>
    Document 19 - file: chart-7f0bc848f94c5ab5b5da39.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>chart-037cad575f4154079a2a39.jpg
    <TEXT>
    Document 20 - file: chart-037cad575f4154079a2a39.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>chart-38d483c558ee5e05ac8a39.jpg
    <TEXT>
    Document 21 - file: chart-38d483c558ee5e05ac8a39.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>chart-96cc823d1ae3f6e2989a39.jpg
    <TEXT>
    Document 22 - file: chart-96cc823d1ae3f6e2989a39.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>chart-669d029fa13a91fa8cea54.jpg
    <TEXT>
    Document 23 - file: chart-669d029fa13a91fa8cea54.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>chart-980b12c3655a35fcc72.jpg
    <TEXT>
    Document 24 - file: chart-980b12c3655a35fcc72.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>chart-a178abbd56d6503f98ba39.jpg
    <TEXT>
    Document 25 - file: chart-a178abbd56d6503f98ba39.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>chart-df3a812968d05f8f7e3a39.jpg
    <TEXT>
    Document 26 - file: chart-df3a812968d05f8f7e3a39.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>chart-e3bbbeb8916a4c24eeca39.jpg
    <TEXT>
    Document 27 - file: chart-e3bbbeb8916a4c24eeca39.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>chart-e23cb90060035eaab80.jpg
    <TEXT>
    Document 28 - file: chart-e23cb90060035eaab80.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>chart-ed07379541ec779ce56.jpg
    <TEXT>
    Document 29 - file: chart-ed07379541ec779ce56.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>chart-f2b9857160591c7cc12.jpg
    <TEXT>
    Document 30 - file: chart-f2b9857160591c7cc12.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>chart-f17e696ae546fe6cd38.jpg
    <TEXT>
    Document 31 - file: chart-f17e696ae546fe6cd38.jpg

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

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>craigreynoldsv31biophoto.jpg
    <TEXT>
    Document 33 - file: craigreynoldsv31biophoto.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>directorskillsmatrixv3.jpg
    <TEXT>
    Document 34 - file: directorskillsmatrixv3.jpg

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

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>earnings2a01.jpg
    <TEXT>
    Document 36 - file: earnings2a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>37
    <FILENAME>environmenticonv2.jpg
    <TEXT>
    Document 37 - file: environmenticonv2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>38
    <FILENAME>equitypiea1a01.jpg
    <TEXT>
    Document 38 - file: equitypiea1a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>39
    <FILENAME>globalreachv4.jpg
    <TEXT>
    Document 39 - file: globalreachv4.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>40
    <FILENAME>boardcharacteristicsv3.jpg
    <TEXT>
    Document 40 - file: boardcharacteristicsv3.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>41
    <FILENAME>jcolemana01.jpg
    <TEXT>
    Document 41 - file: jcolemana01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>42
    <FILENAME>jkiania01.jpg
    <TEXT>
    Document 42 - file: jkiania01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>43
    <FILENAME>jksignature2019a01.jpg
    <TEXT>
    Document 43 - file: jksignature2019a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>44
    <FILENAME>joekiani61913.jpg
    <TEXT>
    Document 44 - file: joekiani61913.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>45
    <FILENAME>julieashimerbiophoto.jpg
    <TEXT>
    Document 45 - file: julieashimerbiophoto.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>46
    <FILENAME>location2.jpg
    <TEXT>
    Document 46 - file: location2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>47
    <FILENAME>ltipie.jpg
    <TEXT>
    Document 47 - file: ltipie.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>48
    <FILENAME>mailboxicon.jpg
    <TEXT>
    Document 48 - file: mailboxicon.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>49
    <FILENAME>masimologo300x1a06.jpg
    <TEXT>
    Document 49 - file: masimologo300x1a06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>50
    <FILENAME>masimologo2019a01.jpg
    <TEXT>
    Document 50 - file: masimologo2019a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>51
    <FILENAME>masimologoblkwhtx3a05.jpg
    <TEXT>
    Document 51 - file: masimologoblkwhtx3a05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>52
    <FILENAME>may29th.jpg
    <TEXT>
    Document 52 - file: may29th.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>53
    <FILENAME>meetingicon.jpg
    <TEXT>
    Document 53 - file: meetingicon.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>54
    <FILENAME>mmichaelcohenbiophotov2.jpg
    <TEXT>
    Document 54 - file: mmichaelcohenbiophotov2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>55
    <FILENAME>myounga01.jpg
    <TEXT>
    Document 55 - file: myounga01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>56
    <FILENAME>onlineicon.jpg
    <TEXT>
    Document 56 - file: onlineicon.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>57
    <FILENAME>plm11616abrochure2019proxyst.jpg
    <TEXT>
    Document 57 - file: plm11616abrochure2019proxyst.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>58
    <FILENAME>producticon2a01.jpg
    <TEXT>
    Document 58 - file: producticon2a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>59
    <FILENAME>profitmargina01.jpg
    <TEXT>
    Document 59 - file: profitmargina01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>60
    <FILENAME>proxycardx1a05.jpg
    <TEXT>
    Document 60 - file: proxycardx1a05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>61
    <FILENAME>qrcodemasimox2a05.jpg
    <TEXT>
    Document 61 - file: qrcodemasimox2a05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>62
    <FILENAME>rearcover2019a01.jpg
    <TEXT>
    Document 62 - file: rearcover2019a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>63
    <FILENAME>recorddatea02.jpg
    <TEXT>
    Document 63 - file: recorddatea02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>64
    <FILENAME>revenuea01.jpg
    <TEXT>
    Document 64 - file: revenuea01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>65
    <FILENAME>sandyfitchbiophotov2.jpg
    <TEXT>
    Document 65 - file: sandyfitchbiophotov2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>66
    <FILENAME>senatorharkinbiophoto.jpg
    <TEXT>
    Document 66 - file: senatorharkinbiophoto.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>67
    <FILENAME>shareholderengagementv414102.jpg
    <TEXT>
    Document 67 - file: shareholderengagementv414102.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>68
    <FILENAME>shipmentsa01.jpg
    <TEXT>
    Document 68 - file: shipmentsa01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>69
    <FILENAME>smartphoneicon.jpg
    <TEXT>
    Document 69 - file: smartphoneicon.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>70
    <FILENAME>stockownershipv1.jpg
    <TEXT>
    Document 70 - file: stockownershipv1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>71
    <FILENAME>supplychainicons.jpg
    <TEXT>
    Document 71 - file: supplychainicons.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>72
    <FILENAME>tlevya01.jpg
    <TEXT>
    Document 72 - file: tlevya01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>73
    <FILENAME>tmcclenahana01.jpg
    <TEXT>
    Document 73 - file: tmcclenahana01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>74
    <FILENAME>toplogowhtx1a06.jpg
    <TEXT>
    Document 74 - file: toplogowhtx1a06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>75
    <FILENAME>toplogowhtx1a07.jpg
    <TEXT>
    Document 75 - file: toplogowhtx1a07.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>76
    <FILENAME>toplogowhtx1a09.jpg
    <TEXT>
    Document 76 - file: toplogowhtx1a09.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>77
    <FILENAME>workforceiconv4.jpg
    <TEXT>
    Document 77 - file: workforceiconv4.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>78
    <FILENAME>yleea01.jpg
    <TEXT>
    Document 78 - file: yleea01.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>