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

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-10-05</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001157543</issuerCik>
        <issuerName>ADVANTAGE ADVISERS MULTI - SECTOR FUND I</issuerName>
        <issuerTradingSymbol>XAMSX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001352548</rptOwnerCik>
            <rptOwnerName>Foster Elizabeth</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>311 SOUTH WACKER DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 6350</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See remarks</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>On October 5, 2005, the Reporting Person became the Chief Compliance Officer of Kilkenny Capital Management LLC(&quot;Kilkenny&quot;), a sub-adviser of the Fund pursuant to a Sub-Investment Adviosry Agreement dated March 21, 2002. Kilkenny is also a non-managing member of the investment adviser.</remarks>

    <ownerSignature>
        <signatureName>/s/ Elizabeth Foster</signatureName>
        <signatureDate>2006-02-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
