<SEC-DOCUMENT>0001093557-18-000134.txt : 20180626
<SEC-HEADER>0001093557-18-000134.hdr.sgml : 20180626
<ACCEPTANCE-DATETIME>20180626201221
ACCESSION NUMBER:		0001093557-18-000134
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180601
FILED AS OF DATE:		20180626
DATE AS OF CHANGE:		20180626

REPORTING-OWNER:	

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

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51222
		FILM NUMBER:		18920346

	MAIL ADDRESS:	
		STREET 1:		754 GRAND VIEW AVENUE
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94114

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DEXCOM INC
		CENTRAL INDEX KEY:			0001093557
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				330857544
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
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<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2018-06-01</periodOfReport>

    <dateOfOriginalSubmission>2018-06-04</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001093557</issuerCik>
        <issuerName>DEXCOM INC</issuerName>
        <issuerTradingSymbol>DXCM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001238485</rptOwnerCik>
            <rptOwnerName>AUGUSTINOS NICHOLAS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6340 SEQUENCE DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92121</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-06-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3449</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.001</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>34464</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
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    <footnotes>
        <footnote id="F1">The RSU Award was granted on June 1, 2018 and 100% of the RSU will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. commom stock upon settlement.</footnote>
        <footnote id="F2">Included in this number are 3,449 restricted stock units which were granted on June 1, 2018 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting.</footnote>
    </footnotes>

    <remarks>This amended Form 4 is being filed to correct the grant date of the RSU Award which was originally reported as May 31, 2018 on the Form 4 filed on June 4, 2018.</remarks>

    <ownerSignature>
        <signatureName>By: Kevin Sun For: Nicholas Augustinos</signatureName>
        <signatureDate>2018-06-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
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