<SEC-DOCUMENT>0001666071-19-000105.txt : 20190828
<SEC-HEADER>0001666071-19-000105.hdr.sgml : 20190828
<ACCEPTANCE-DATETIME>20190828170400
ACCESSION NUMBER:		0001666071-19-000105
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190826
FILED AS OF DATE:		20190828
DATE AS OF CHANGE:		20190828

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SOMERS KIRK
		CENTRAL INDEX KEY:			0001204015

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38386
		FILM NUMBER:		191062614

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Cardlytics, Inc.
		CENTRAL INDEX KEY:			0001666071
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC. [7370]
		IRS NUMBER:				263039436
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		675 PONCE DE LEON AVENUE, NE
		STREET 2:		SUITE 6000
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30308
		BUSINESS PHONE:		888-798-5802

	MAIL ADDRESS:	
		STREET 1:		675 PONCE DE LEON AVENUE, NE
		STREET 2:		SUITE 6000
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30308
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_156702622063543.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-08-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001666071</issuerCik>
        <issuerName>Cardlytics, Inc.</issuerName>
        <issuerTradingSymbol>CDLX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001204015</rptOwnerCik>
            <rptOwnerName>SOMERS KIRK</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CARDLYTICS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>675 PONCE DE LEON AVENUE NE, SUITE 6000</rptOwnerStreet2>
            <rptOwnerCity>ATLANTA</rptOwnerCity>
            <rptOwnerState>GA</rptOwnerState>
            <rptOwnerZipCode>30308</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Legal &amp; Privacy Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance Stock Unit</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-08-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>31250</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Sock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>31250.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>31250</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each performance stock unit (&quot;PSU&quot;) represents a contingent right to receive one share of the Issuer's Common Stock.</footnote>
        <footnote id="F2">On August 26, 2019, the Compensation Committee of the Issuer's Board of Directors certified that a target minimum trailing 30-day average closing price of the Issuer's common stock was achieved (the &quot;Certification&quot;) resulting in the first tranche of the PSU to be awarded, which shares are reflected in Column 5 above.  Fifty percent (50%) of the shares subject to the first tranche of the PSU vested upon the Certification, twenty-five percent (25%) of the shares subject to the first tranche of the PSU will vest 6 months after the Certification, and twenty-five percent (25%) of the shares subject to the first tranche of the PSU will vest 12 months after the Certification. The PSU has not yet settled.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Kirk L. Somers</signatureName>
        <signatureDate>2019-08-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
