<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-12-29</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001308606</issuerCik>
        <issuerName>SPIRIT REALTY CAPITAL, INC.</issuerName>
        <issuerTradingSymbol>SRC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001733373</rptOwnerCik>
            <rptOwnerName>Heimlich Kenneth</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2727 N. HARWOOD STREET, SUITE 300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP, Chief Investment Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

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                    <footnoteId id="F6"/>
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    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents the accelerated vesting of additional shares pursuant to a Performance Share Award granted on February 9, 2022 based on performance of such award, pursuant to the Company's incentive award plan.</footnote>
        <footnote id="F2">Represents shares surrendered to Issuer to satisfy income tax and remittance obligations of the reporting person in connection with the accelerated vesting of performance shares pursuant to a Performance Share Award granted on February 9, 2022.</footnote>
        <footnote id="F3">Represents the accelerated vesting of additional shares pursuant to a Performance Share Award granted on January 19, 2023 based on performance of such award, pursuant to the Company's incentive award plan.</footnote>
        <footnote id="F4">Represents shares surrendered to Issuer to satisfy income tax and remittance obligations of the reporting person in connection with the accelerated vesting of performance shares pursuant to the Performance Share Award granted on January 19, 2023.</footnote>
        <footnote id="F5">Represents shares earned pursuant to a Performance Share Award granted on February 17, 2021 pursuant to the Company's incentive award plan.</footnote>
        <footnote id="F6">Represents shares surrendered to Issuer to satisfy income tax and remittance obligations of the reporting person in connection with the issuance of performance shares pursuant to a Performance Share Award granted on February 17, 2021.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Rochelle Thomas</signatureName>
        <signatureDate>2024-01-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
