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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-08-11</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001785424</issuerCik>
        <issuerName>Katapult Holdings, Inc.</issuerName>
        <issuerTradingSymbol>KPLT</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001866031</rptOwnerCik>
            <rptOwnerName>Medlin Derek</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>5360 LEGACY DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>BUILDING 2</rptOwnerStreet2>
            <rptOwnerCity>PLANO</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75024-7141</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Operating Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <remarks>The reporting person resigned as the issuer's Chief Operating Officer effective August 11, 2026. As a result, the reporting person is no longer subject to Section 16 in connection with his transactions in the equity securities of the issuer and therefore will no longer report any such transactions on Form 4 or Form 5.</remarks>

    <ownerSignature>
        <signatureName>/s/ Ryan Wigdor as Attorney-in-Fact for Derek Medlin</signatureName>
        <signatureDate>2026-08-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
