<SEC-DOCUMENT>0000950123-16-016067.txt : 20160506
<SEC-HEADER>0000950123-16-016067.hdr.sgml : 20160506
<ACCEPTANCE-DATETIME>20160428131959
ACCESSION NUMBER:		0000950123-16-016067
CONFORMED SUBMISSION TYPE:	13F-HR
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20160331
FILED AS OF DATE:		20160428
DATE AS OF CHANGE:		20160505
EFFECTIVENESS DATE:		20160428

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEI INVESTMENTS CO
		CENTRAL INDEX KEY:			0000350894
		STANDARD INDUSTRIAL CLASSIFICATION:	SECURITY BROKERS, DEALERS & FLOTATION COMPANIES [6211]
		IRS NUMBER:				231707341
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		13F-HR
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-16454
		FILM NUMBER:		161598674

	BUSINESS ADDRESS:	
		STREET 1:		1 FREEDOM VALLEY DRIVE
		CITY:			OAKS
		STATE:			PA
		ZIP:			19456-1100
		BUSINESS PHONE:		6106761000

	MAIL ADDRESS:	
		STREET 1:		1 FREEDOM VALLEY DRIVE
		CITY:			OAKS
		STATE:			PA
		ZIP:			19456-1100

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SEI INVESTMENT CO
		DATE OF NAME CHANGE:	20040806

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SEI CORP
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>13F-NT
<SEQUENCE>1
<FILENAME>primary_doc.xml
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    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <flags>
        <confirmingCopyFlag>false</confirmingCopyFlag>
        <returnCopyFlag>true</returnCopyFlag>
        <overrideInternetFlag>false</overrideInternetFlag>
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      <filer>
        <credentials>
          <cik>0000350894</cik>
          <ccc>XXXXXXXX</ccc>
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      <periodOfReport>03-31-2016</periodOfReport>
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    <coverPage>
      <reportCalendarOrQuarter>03-31-2016</reportCalendarOrQuarter>
      <filingManager>
        <name>SEI INVESTMENTS CO</name>
        <address>
          <ns1:street1>1 Freedom Valley Drive</ns1:street1>
          <ns1:city>Oaks</ns1:city>
          <ns1:stateOrCountry>PA</ns1:stateOrCountry>
          <ns1:zipCode>19456-1100</ns1:zipCode>
        </address>
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      <form13FFileNumber>028-16454</form13FFileNumber>
      <otherManagersInfo>
        <otherManager>
          <form13FFileNumber>028-16454</form13FFileNumber>
          <name>SEI Investments Company</name>
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      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>Laura Smolenski</name>
      <title>CCO</title>
      <phone>610-676-3479</phone>
      <signature>Laura Smolenski</signature>
      <city>Oaks</city>
      <stateOrCountry>PA</stateOrCountry>
      <signatureDate>04-28-2016</signatureDate>
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