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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-12-29</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001827821</issuerCik>
        <issuerName>Forge Global Holdings, Inc.</issuerName>
        <issuerTradingSymbol>FRGE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002053840</rptOwnerCik>
            <rptOwnerName>Nevin James</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>4 EMBARCADERO CENTER, FLOOR 15</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94111</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock,  $0.0001 par value per share</value>
            </securityTitle>
            <transactionDate>
                <value>2025-12-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>5762</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>23695</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">In connection with that certain Agreement and Plan of Merger, dated as of November 5, 2025 (the &quot;Merger Agreement&quot;), entered into by and among the Issuer, The Charles Schwab Corporation, a Delaware corporation (&quot;Schwab&quot;), and Ember-Falcon Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Schwab, the Board of Directors of the Issuer approved the acceleration of the payment of certain equity awards to mitigate certain adverse tax consequences under Sections 280G or 4999 of the Internal Revenue Code of 1986, as amended, that could arise in connection with the anticipated transactions under the Merger Agreement. The tax withholding reported in this Form 4 relates to the partially accelerated settlement of equity awards that was contingent upon the Reporting Person's agreement to repay accelerated compensation amounts under certain conditions.</footnote>
        <footnote id="F2">Represents shares that have been withheld by the Issuer to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock units.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ James Nevin, Attorney-in-Fact</signatureName>
        <signatureDate>2025-12-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
