<SEC-DOCUMENT>0001093557-25-000217.txt : 20250618
<SEC-HEADER>0001093557-25-000217.hdr.sgml : 20250618
<ACCEPTANCE-DATETIME>20250618163127
ACCESSION NUMBER:		0001093557-25-000217
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20250616
FILED AS OF DATE:		20250618
DATE AS OF CHANGE:		20250618

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Brown Michael Jon
		CENTRAL INDEX KEY:			0001899922
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51222
		FILM NUMBER:		251057374

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

	FORMER NAME:	
		FORMER CONFORMED NAME:	Brown Micheal Jon
		DATE OF NAME CHANGE:	20211216

ISSUER:		

	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

	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
<SEQUENCE>1
<FILENAME>wk-form4_1750278680.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-06-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001899922</rptOwnerCik>
            <rptOwnerName>Brown Michael Jon</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>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP, Chief Legal Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>1</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-06-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>500</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>82.80</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>95102</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">On February 21, 2025, Mr. Brown adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Brown. The shares set forth above were sold pursuant to the 10b5-1 Plan.</footnote>
        <footnote id="F2">Included in this number are 86,490 unvested restricted stock units, 29,922 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 22,798 of which were granted on March 8, 2025 and shall vest through March 8, 2027, 14,474 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 7,256 of which were granted on March 8, 2023 and shall vest through March 8, 2026, and 12,040 of which were granted on March 8, 2022 and shall vest through March 8, 2026.</footnote>
    </footnotes>

    <remarks>Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Jereme M. Sylvain, as Attorney-in-Fact for Michael Jon Brown</signatureName>
        <signatureDate>2025-06-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>brown-poa.htm
<DESCRIPTION>EX-24
<TEXT>
<html><head>
<!-- Document created using Wdesk -->
<!-- Copyright 2025 Workiva -->
<title>Document</title></head><body><div id="i3f09e46ca95a44349140532ba93a0408_1"></div><div style="min-height:43.2pt;width:100%"><div style="margin-bottom:8pt"><font><br></font></div></div><div style="margin-bottom:12pt;text-align:center"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">POWER OF ATTORNEY</font></div><div style="margin-bottom:9pt;text-align:justify"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The undersigned hereby makes, constitutes and appoints each of Jereme Sylvain, Christophe Cantenot, and Stephanie Fong, and any delegee thereof, or either of them or a delegee acting singly, and with full power of substitution, re-substitution and delegation, the undersigned&#8217;s true and lawful attorney in fact (each of such persons and their substitutes and delegees being referred to herein as the &#8220;Attorney-in-Fact&#8221;), with full power to act for the undersigned and in the undersigned&#8217;s name, place and stead, in the undersigned&#8217;s capacity as an officer, director or stockholder of DexCom, Inc. (the &#8220;Company&#8221;), to&#58;</font></div><div style="margin-bottom:9pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">Take such actions as may be necessary or appropriate to enable the undersigned to submit and file forms, schedules and other documents with the U.S. Securities and Exchange Commission (&#8220;SEC&#8221;) utilizing the SEC&#8217;s Electronic Data Gathering and Retrieval (&#8220;EDGAR&#8221;) system, which actions may include (a) enrolling the undersigned in EDGAR Next and (b) preparing, executing and submitting to the SEC a Form ID, amendments thereto, and such other documents and information as may be necessary or appropriate to obtain codes and passwords enabling the undersigned to make filings and submissions utilizing the EDGAR system&#59;</font></div><div style="margin-bottom:9pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">Prepare and execute any and all forms, schedules and other documents (including any amendments thereto) the undersigned is required to file with the SEC, or which the Attorney-in-Fact considers it advisable for the undersigned to file with the SEC, under Section 13 or Section 16 of the Securities Exchange Act of 1934 or any rule or regulation thereunder, or under Rule 144 under the Securities Act of 1933 (&#8220;Rule 144&#8221;), including Forms 3, 4 and 5, Schedules 13D and 13G, and Forms 144 (all such forms, schedules and other documents being referred to herein as &#8220;SEC Filings&#8221;)&#59;</font></div><div style="margin-bottom:9pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">Submit and file SEC Filings with the SEC utilizing the EDGAR system or cause them to be submitted and filed by a person appointed under </font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline">Section 5</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> below&#59;</font></div><div style="margin-bottom:9pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">4.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">File, submit or otherwise deliver SEC Filings to any securities exchange on which the Company&#8217;s securities may be listed or traded&#59;</font></div><div style="margin-bottom:9pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">5.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">Act as an account administrator for the undersigned&#8217;s EDGAR account, including&#58; (i) appoint, remove and replace account administrators, account users, technical administrators and delegated entities&#59; (ii) maintain the security of the undersigned&#8217;s EDGAR account, including modification of access codes&#59; (iii) maintain, modify and certify the accuracy of information on the undersigned&#8217;s EDGAR account dashboard&#59; (iv) act as the EDGAR point of contact with respect to the undersigned&#8217;s EDGAR account&#59; and (v) any other actions contemplated by Rule 10 of Regulation S-T with respect to account administrators&#59;</font></div><div style="margin-bottom:9pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">6.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">Cause the Company to accept a delegation of authority from any of the undersigned&#8217;s EDGAR account administrators and, pursuant to that delegation, authorize the Company&#8217;s EDGAR account administrators to appoint, remove or replace users for the undersigned&#8217;s EDGAR account&#59; and</font></div><div style="margin-bottom:9pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">7.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">Obtain, as the undersigned&#8217;s representative and on the undersigned&#8217;s behalf, information regarding transactions in the Company&#8217;s equity securities from any third party, including the Company and any brokers, dealers, employee benefit plan administrators and trustees, and the undersigned hereby authorizes any such third party to release any such information to the Attorney-in-Fact.</font></div><div style="height:43.2pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="margin-bottom:8pt"><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:43.2pt;width:100%"><div style="margin-bottom:8pt"><font><br></font></div></div><div style="margin-bottom:9pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The undersigned acknowledges that&#58;</font></div><div style="margin-bottom:9pt;padding-left:36pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">a.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">This Power of Attorney authorizes, but does not require, the Attorney-in-Fact to act in his or her discretion on information provided to such Attorney-in-Fact without independent verification of such information&#59;</font></div><div style="margin-bottom:9pt;padding-left:36pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">b.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">Any documents prepared or executed by the Attorney-in-Fact on behalf of the undersigned pursuant to this Power of Attorney will be in such form and will contain such information as the Attorney-in-Fact, in his or her discretion, deems necessary or desirable&#59;</font></div><div style="margin-bottom:9pt;padding-left:36pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">c.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:28.23pt">Neither the Company nor the Attorney-in-Fact assumes any liability for the undersigned&#8217;s responsibility to comply with the requirements of Section 13 or Section 16 of the Exchange Act or Rule 144, any liability of the undersigned for any failure to comply with such requirements, or any liability of the undersigned for disgorgement of profits under Section 16(b) of the Exchange Act&#59; and</font></div><div style="margin-bottom:9pt;padding-left:36pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">d.</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:27.67pt">This Power of Attorney does not relieve the undersigned from responsibility for compliance with the undersigned&#8217;s obligations under Section 13 or Section 16 of the Exchange Act, including, without limitation, the reporting requirements under Section 13 or Section 16 of the Exchange Act.</font></div><div style="margin-bottom:9pt;text-align:justify"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The undersigned hereby grants to the Attorney-in-Fact full power and authority to do and perform each and every act and thing requisite, necessary or advisable to be done in connection with the foregoing, as fully, to all intents and purposes, as the undersigned might or could do in person, hereby ratifying and confirming all that the Attorney-in-Fact, or his or her substitute or substitutes, shall lawfully do or cause to be done by authority of this Power of Attorney.</font></div><div style="margin-bottom:9pt;text-align:justify"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 4 or 5 or Schedules 13D or 13G or Forms 144 with respect to the undersigned&#8217;s holdings of and transactions in securities of the Company, unless earlier revoked by the undersigned in a signed writing delivered to the Attorney-in-Fact. This Power of Attorney revokes all previous powers of attorney with respect to the subject matter of this Power of Attorney.</font></div><div style="margin-bottom:9pt"><font><br></font></div><div style="margin-bottom:9pt;text-align:center"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">&#91;Signature Page to Follow&#93;</font></div><div style="height:43.2pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="margin-bottom:8pt"><font><br></font></div></div></div><div id="i3f09e46ca95a44349140532ba93a0408_4"></div><hr style="page-break-after:always"><div style="min-height:43.2pt;width:100%"><div style="margin-bottom:8pt"><font><br></font></div></div><div style="margin-bottom:8pt"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney as of May 12, 2025.</font></div><div style="margin-bottom:8pt"><font><br></font></div><div style="margin-bottom:8pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:150.00pt"><tr><td style="width:1.0pt"></td><td style="width:148.00pt"></td><td style="width:1.0pt"></td></tr><tr style="height:14pt"><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#47;s&#47; Mike Brown</font></td></tr><tr style="height:14pt"><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:top"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Signature</font></td></tr><tr style="height:14pt"><td colspan="3" style="padding:0 1pt"></td></tr><tr style="height:14pt"><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Mike Brown</font></td></tr><tr style="height:14pt"><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:top"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Print Name</font></td></tr></table></div><div style="height:43.2pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="margin-bottom:8pt"><font><br></font></div></div></div></body></html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
