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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-03-01</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000083246</issuerCik>
        <issuerName>HSBC USA INC /MD/</issuerName>
        <issuerTradingSymbol>HBA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001385513</rptOwnerCik>
            <rptOwnerName>Armishaw Andrew C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O HSBC BANK USA, N.A.</rptOwnerStreet1>
            <rptOwnerStreet2>452 FIFTH AVENUE</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10081</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SEVP &amp; Chief Tech &amp; Serv Off</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks>No longer a Policy Making Officer of HSBC USA Inc.</remarks>

    <ownerSignature>
        <signatureName>/s/ Mick Forde, Sr. Vice President, Deputy General Counsel-Corporate and Asst. Secretary of HSBC USA Inc. and Attorney-In-Fact for Andrew Armishaw</signatureName>
        <signatureDate>2011-03-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
