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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-08-13</periodOfReport>

    <issuer>
        <issuerCik>0001828811</issuerCik>
        <issuerName>Li-Cycle Holdings Corp.</issuerName>
        <issuerTradingSymbol>LICY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001877376</rptOwnerCik>
            <rptOwnerName>Kochhar Ajay</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LI-CYCLE HOLDINGS CORP</rptOwnerStreet1>
            <rptOwnerStreet2>207 QUEENS QUAY WEST, SUITE 590</rptOwnerStreet2>
            <rptOwnerCity>TORONTO</rptOwnerCity>
            <rptOwnerState>A6</rptOwnerState>
            <rptOwnerZipCode>M5J 1A7</rptOwnerZipCode>
            <rptOwnerStateDescription>ONTARIO, CANADA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>true</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>President and CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001878744</rptOwnerCik>
            <rptOwnerName>2829908 Delaware LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2351 ROYAL WINDSOR DR UNIT 10</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MISSISSAUGA</rptOwnerCity>
            <rptOwnerState>A6</rptOwnerState>
            <rptOwnerZipCode>L5J 4S7</rptOwnerZipCode>
            <rptOwnerStateDescription>ONTARIO, CANADA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>true</isTenPercentOwner>
            <isOther>false</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2024-08-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2375</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>165782</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3107826</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The transaction reported reflects automatic sell to cover transactions that do not represent a discretionary trade by the Reporting Person in order to pay the tax liability arising from the vesting and settlement of restricted stock units (&quot;RSUs&quot;).</footnote>
        <footnote id="F2">Includes 14,590 RSUs vesting between February 2, 2024 and January 27, 2026. Each restricted stock unit represents a right to receive one share of the Issuer's common shares.</footnote>
        <footnote id="F3">On June 3, 2024, Li-Cycle Holdings Corp. effected a share consolidation of its common shares (the &quot;Share Consolidation&quot;) at a consolidation ratio of one post-consolidation share for every eight pre-consolidation shares.  The number of securities reported on this Form 4 have been adjusted to reflect the Share Consolidation.</footnote>
        <footnote id="F4">Held by 2829908 Delaware LLC, a Delaware limited liability company. Mr. Kochhar has the sole power to control the voting and disposition of the common shares held by 2829908 Delaware LLC by oral agreement. Mr. Kochhar is a director and officer of the Issuer.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Ajay Kochhar, /s/ Ajay Kochhar</signatureName>
        <signatureDate>2024-08-15</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>2829908 Delaware LLC, By: /s/ Ajay Kochhar, Authorized Signatory</signatureName>
        <signatureDate>2024-08-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
