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

    <schemaVersion>X0607</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2026-01-12</periodOfReport>

    <dateOfOriginalSubmission>2026-02-26</dateOfOriginalSubmission>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0002033264</issuerCik>
        <issuerName>Vertical Data Inc.</issuerName>
        <issuerTradingSymbol>VDTA</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001998054</rptOwnerCik>
            <rptOwnerName>Leverton Jaime</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O VERTICAL DATA INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1980 FESTIVAL PLAZA DRIVE, SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>LAS VEGAS</rptOwnerCity>
            <rptOwnerState>NV</rptOwnerState>
            <rptOwnerZipCode>89135</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>72052</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Jaime Leverton Ventures &amp; Advisory Inc.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This Amendment No. 1 amends the Form 3 filed February 26, 2026 to amend the Table I line reporting 72,052 shares of common stock, which the original Form 3 reported as beneficially owned directly. Those shares are held of record by Jaime Leverton Ventures &amp; Advisory Inc. and are beneficially owned indirectly by the reporting person.</footnote>
    </footnotes>

    <remarks>Only the line being amended is set forth above, in accordance with General Instruction 8. No derivative securities holdings are amended by this Amendment; the stock option reported on the original Form 3 is unchanged and is not repeated here.</remarks>

    <ownerSignature>
        <signatureName>/s/ Jaime Leverton</signatureName>
        <signatureDate>2026-10-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
