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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2026-01-23</periodOfReport>

    <dateOfOriginalSubmission>2026-03-04</dateOfOriginalSubmission>

    <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>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-01-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>187500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.05</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>259552</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Jaime Leverton Ventures &amp; Advisory Inc.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This Amendment also amends the reporting of ownership form. The original Form 4 reported the securities acquired, and the 259,552 shares beneficially owned following the transaction, as held directly. Those shares were issued to, and are held of record by, Jaime Leverton Ventures &amp; Advisory Inc., and are beneficially owned indirectly by the reporting person. See also the Form 3/A filed herewith.</footnote>
    </footnotes>

    <remarks>This Amendment No. 1 amends the Form 4 filed March 4, 2026 to correct Item 3, Date of Earliest Transaction Required to be Reported, which the original Form 4 reported as 01/23/2006. The correct date is January 23, 2026, as reported on the Table I transaction line of the original Form 4. Only the line being amended is set forth above, in accordance with General Instruction 8.</remarks>

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