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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-03-20</periodOfReport>

    <notSubjectToSection16>true</notSubjectToSection16>

    <issuer>
        <issuerCik>0001845368</issuerCik>
        <issuerName>HCM Acquisition Corp</issuerName>
        <issuerTradingSymbol>HCMA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001855164</rptOwnerCik>
            <rptOwnerName>Bischoff Steven</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O  HCM ACQUISITION CORP</rptOwnerStreet1>
            <rptOwnerStreet2>100 FIRST STAMFORD PLACE, SUITE 330</rptOwnerStreet2>
            <rptOwnerCity>STAMFORD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06902</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class B Ordinary Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2024-03-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person resigned as a director of the Issuer and disposed of all Issuer equity securities effective as of the consummation of the business combination pursuant to that certain Amended &amp; Restated Business Combination, dated August 2, 2023, as amended on December 31, 2023 (the &quot;Business Combination Agreement&quot;), and ceased to be a reporting person with respect to the Issuer.</footnote>
        <footnote id="F2">Pursuant to the Business Combination Agreement, each issued and outstanding share of the Issuer's ordinary shares automatically converted into the right to receive Murano Global Investments PLC ordinary shares on a one-to-one basis upon the consummation of such business combination.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Steven Bischoff, by James Bond, Attorney-in-Fact</signatureName>
        <signatureDate>2024-03-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
