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

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-03-18</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001872195</issuerCik>
        <issuerName>Bullish</issuerName>
        <issuerTradingSymbol>BLSH</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001861762</rptOwnerCik>
            <rptOwnerName>Simon Karen Jo</rptOwnerName>
        </reportingOwnerId>
    <reportingOwnerAddress>
      <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
      <rptOwnerStreet1>OFFICE 101, 103, 105 SUITE 70202, BLDG A</rptOwnerStreet1>
      <rptOwnerStreet2>BLOCK 7, 60 NEXUS WAY, CAMANA BAY</rptOwnerStreet2>
      <rptOwnerCity>GEORGE TOWN, GRAND CAYMAN</rptOwnerCity>
      <rptOwnerCountry>E9</rptOwnerCountry>
      <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
    </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>20270</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4139</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6208</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents 4,139 restricted share units (&quot;RSUs&quot;) granted on November 6, 2025 under the Bullish 2025 Omnibus Incentive Plan. The RSUs vest in full on November 6, 2026. Each RSU represents a right to receive one ordinary share of Bullish upon vesting.</footnote>
        <footnote id="F2">Represents 6,208 RSUs granted on November 6, 2025 under the Bullish 2025 Omnibus Incentive Plan, vesting in three equal annual installments from the grant date. Each RSU represents a right to receive one ordinary share of Bullish upon vesting.</footnote>
    </footnotes>

    <remarks>Due to the issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b) under the Act, the reporting person's transactions in the issuer's equity securities are exempt from Sections 16(b) and 16(c) of the Act.</remarks>

    <ownerSignature>
        <signatureName>/s/ Karen Jo Simon</signatureName>
        <signatureDate>2026-03-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
