<SEC-DOCUMENT>0001959173-25-003929.txt : 20250609
<SEC-HEADER>0001959173-25-003929.hdr.sgml : 20250609
<ACCEPTANCE-DATETIME>20250609155909
ACCESSION NUMBER:		0001959173-25-003929
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250609
DATE AS OF CHANGE:		20250609

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DEXCOM INC
		CENTRAL INDEX KEY:			0001093557
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		EIN:				330857544
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	000-51222
		FILM NUMBER:		251033889

	BUSINESS ADDRESS:	
		STREET 1:		6340 SEQUENCE DRIVE
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121
		BUSINESS PHONE:		8582000200

	MAIL ADDRESS:	
		STREET 1:		6340 SEQUENCE DRIVE
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AUGUSTINOS NICHOLAS
		CENTRAL INDEX KEY:			0001238485
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		754 GRAND VIEW AVENUE
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94114
</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>0001238485</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>


    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001093557</issuerCik>
      <issuerName>DEXCOM INC</issuerName>
      <secFileNumber>000-51222</secFileNumber>
      <issuerAddress>
        <com:street1>6340 SEQUENCE DRIVE</com:street1>
        <com:city>SAN DIEGO</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>92121</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>8582000200</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>AUGUSTINOS NICHOLAS</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Fidelity Brokerage Services LLC</name>
        <address>
          <com:street1>245 Summer Street</com:street1>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02110</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>6290</noOfUnitsSold>
      <aggregateMarketValue>546663.91</aggregateMarketValue>
      <noOfUnitsOutstanding>392107501</noOfUnitsOutstanding>
      <approxSaleDate>06/09/2025</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <acquiredDate>05/19/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Vested RSU Grant</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>DEXCOM, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3672</amountOfSecuritiesAcquired>
      <paymentDate>05/19/2022</paymentDate>
      <natureOfPayment>N/A</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <acquiredDate>05/24/2025</acquiredDate>
      <natureOfAcquisitionTransaction>Vested RSU Grant</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>DEXCOM, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>2618</amountOfSecuritiesAcquired>
      <paymentDate>05/24/2025</paymentDate>
      <natureOfPayment>N/A</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>06/09/2025</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>03/14/2025</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/ Audrey Skillern, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Nicholas Augustinos</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
