<SEC-DOCUMENT>0001141391-18-000098.txt : 20180628
<SEC-HEADER>0001141391-18-000098.hdr.sgml : 20180628
<ACCEPTANCE-DATETIME>20180628120025
ACCESSION NUMBER:		0001141391-18-000098
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180626
FILED AS OF DATE:		20180628
DATE AS OF CHANGE:		20180628

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GENACHOWSKI JULIUS
		CENTRAL INDEX KEY:			0001184231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32877
		FILM NUMBER:		18924266

	MAIL ADDRESS:	
		STREET 1:		C/O INTERACTIVECORP
		STREET 2:		152 WEST 57TH STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Mastercard Inc
		CENTRAL INDEX KEY:			0001141391
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
		IRS NUMBER:				134172551
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2000 PURCHASE STREET
		CITY:			PURCHASE
		STATE:			NY
		ZIP:			10577
		BUSINESS PHONE:		9142492000

	MAIL ADDRESS:	
		STREET 1:		2000 PURCHASE STREET
		CITY:			PURCHASE
		STATE:			NY
		ZIP:			10577

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MASTERCARD INC
		DATE OF NAME CHANGE:	20010525
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_153020160700983.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-06-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001141391</issuerCik>
        <issuerName>Mastercard Inc</issuerName>
        <issuerTradingSymbol>MA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001184231</rptOwnerCik>
            <rptOwnerName>GENACHOWSKI JULIUS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2000 PURCHASE STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PURCHASE</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10577-2509</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-06-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>993</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8527.173</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents deferred stock unit award pursuant to the terms of a stockholder-approved non-employee director equity compensation plan.  The award was fully vested on June 26, 2018, the date of grant, but will settle on the date of termination of the reporting person's service as a director.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Craig R. Brown, Assistant Corporate Secretary, attorney-in-fact for Julius Genachowski pursuant to a power of attorney dated September 16, 2014</signatureName>
        <signatureDate>2018-06-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
