<SEC-DOCUMENT>0001921094-25-000409.txt : 20250424
<SEC-HEADER>0001921094-25-000409.hdr.sgml : 20250424
<ACCEPTANCE-DATETIME>20250424162026
ACCESSION NUMBER:		0001921094-25-000409
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250424
DATE AS OF CHANGE:		20250424

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MASIMO CORP
		CENTRAL INDEX KEY:			0000937556
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS [3845]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		EIN:				330368882
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1228

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-33642
		FILM NUMBER:		25867631

	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

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			McClenahan Thomas Samuel
		CENTRAL INDEX KEY:			0001575205
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		40 PARKER
		CITY:			IRVINE
		STATE:			CA
		ZIP:			92618
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001575205</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000937556</issuerCik>
      <issuerName>MASIMO CORP</issuerName>
      <secFileNumber>001-33642</secFileNumber>
      <issuerAddress>
        <com:street1>52 DISCOVERY</com:street1>
        <com:city>IRVINE</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>92618</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>949-297-7000</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>McClenahan Thomas Samuel</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Former Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab &amp; Co., Inc.</name>
        <address>
          <com:street1>3000 Schwab Way,</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>26300</noOfUnitsSold>
      <aggregateMarketValue>4285475.00</aggregateMarketValue>
      <noOfUnitsOutstanding>53948792</noOfUnitsOutstanding>
      <approxSaleDate>04/24/2025</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>04/24/2025</acquiredDate>
      <natureOfAcquisitionTransaction>Employee Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>MASIMO CORPORATION</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>26300</amountOfSecuritiesAcquired>
      <paymentDate>04/24/2025</paymentDate>
      <natureOfPayment>Broker Payment for Cashless Exercise</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Thomas Samuel McClenahan</name>
        <address>
          <com:street1>52 DISCOVERY</com:street1>
          <com:city>IRVINE</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>92618</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>MASIMO CORP</securitiesClassTitle>
      <saleDate>03/03/2025</saleDate>
      <amountOfSecuritiesSold>49000</amountOfSecuritiesSold>
      <grossProceeds>9365578.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>04/24/2025</noticeDate>
      <signature>Thomas Samuel McClenahan</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
