<SUBMISSION>
<ACCESSION-NUMBER>0000350894-08-000083
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20081112
<FILING-DATE>20081114
<DATE-OF-FILING-DATE-CHANGE>20081114
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>LOUGHLIN EDWARD
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<FILING-VALUES>
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<ACT>34
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<FILM-NUMBER>081187879
</FILING-VALUES>
<BUSINESS-ADDRESS>
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<CITY>OAKS
<STATE>PA
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</BUSINESS-ADDRESS>
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<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>SEI INVESTMENTS CO
<CIK>0000350894
<ASSIGNED-SIC>6211
<IRS-NUMBER>231707341
<STATE-OF-INCORPORATION>PA
<FISCAL-YEAR-END>1231
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<BUSINESS-ADDRESS>
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<STATE>PA
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<PHONE>6106761000
</BUSINESS-ADDRESS>
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<STATE>PA
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<DATE-CHANGED>20040806
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<FORMER-COMPANY>
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<DOCUMENT>
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                <transactionShares>
                    <value>1000</value>
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                <transactionPricePerShare>
                    <value>15.28</value>
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                <transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>646053</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
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            <transactionAmounts>
                <transactionShares>
                    <value>2</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>15.32</value>
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                <transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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                <transactionShares>
                    <value>200</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>15.33</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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            <transactionAmounts>
                <transactionShares>
                    <value>700</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>15.36</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>645151</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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            <transactionDate>
                <value>2008-11-12</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <transactionShares>
                    <value>300</value>
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                <transactionPricePerShare>
                    <value>15.37</value>
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                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>644851</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2008-11-12</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
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                <transactionShares>
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                <transactionPricePerShare>
                    <value>15.38</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>643851</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Ruth Montgomery (attorney in fact)</signatureName>
        <signatureDate>2008-11-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
