    <SEC-DOCUMENT>0000350894-20-000023-index.html : 20200423
    <SEC-HEADER>0000350894-20-000023.hdr.sgml : 20200423
    <ACCEPTANCE-DATETIME>20200423155311
    ACCESSION NUMBER:		0000350894-20-000023
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		52
    CONFORMED PERIOD OF REPORT:	20200603
    FILED AS OF DATE:		20200423
    DATE AS OF CHANGE:		20200423
    EFFECTIVENESS DATE:		20200423

    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:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-10200
    		FILM NUMBER:		20810933

    	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>DEF 14A
    <SEQUENCE>1
    <FILENAME>a2020stylizedproxystatement.htm
    <DESCRIPTION>DEFINITIVE PROXY STATEMENT
    <TEXT>
    Document 1 - file: a2020stylizedproxystatement.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>sei2020proxyc001a01.jpg
    <TEXT>
    Document 2 - file: sei2020proxyc001a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>sei2020proxyc002a01.jpg
    <TEXT>
    Document 3 - file: sei2020proxyc002a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>seic2019proxystatementfi001.jpg
    <TEXT>
    Document 4 - file: seic2019proxystatementfi001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>seic2019proxystatementfi002.jpg
    <TEXT>
    Document 5 - file: seic2019proxystatementfi002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>seic2019proxystatementfi003.jpg
    <TEXT>
    Document 6 - file: seic2019proxystatementfi003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>seic2019proxystatementfi004.jpg
    <TEXT>
    Document 7 - file: seic2019proxystatementfi004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>seic2019proxystatementfi005.jpg
    <TEXT>
    Document 8 - file: seic2019proxystatementfi005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>seic2019proxystatementfi006.jpg
    <TEXT>
    Document 9 - file: seic2019proxystatementfi006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>seic2019proxystatementfi007.jpg
    <TEXT>
    Document 10 - file: seic2019proxystatementfi007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>seic2019proxystatementfi008.jpg
    <TEXT>
    Document 11 - file: seic2019proxystatementfi008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>seic2019proxystatementfi009.jpg
    <TEXT>
    Document 12 - file: seic2019proxystatementfi009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>seic2019proxystatementfi010.jpg
    <TEXT>
    Document 13 - file: seic2019proxystatementfi010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>seic2019proxystatementfi011.jpg
    <TEXT>
    Document 14 - file: seic2019proxystatementfi011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>seic2019proxystatementfi012.jpg
    <TEXT>
    Document 15 - file: seic2019proxystatementfi012.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>seic2019proxystatementfi013.jpg
    <TEXT>
    Document 16 - file: seic2019proxystatementfi013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>seic2019proxystatementfi014.jpg
    <TEXT>
    Document 17 - file: seic2019proxystatementfi014.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>seic2019proxystatementfi015.jpg
    <TEXT>
    Document 18 - file: seic2019proxystatementfi015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>seic2019proxystatementfi016.jpg
    <TEXT>
    Document 19 - file: seic2019proxystatementfi016.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>seic2019proxystatementfi017.jpg
    <TEXT>
    Document 20 - file: seic2019proxystatementfi017.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>seic2019proxystatementfi018.jpg
    <TEXT>
    Document 21 - file: seic2019proxystatementfi018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>seic2019proxystatementfi019.jpg
    <TEXT>
    Document 22 - file: seic2019proxystatementfi019.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>seic2019proxystatementfi020.jpg
    <TEXT>
    Document 23 - file: seic2019proxystatementfi020.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>seic2019proxystatementfi021.jpg
    <TEXT>
    Document 24 - file: seic2019proxystatementfi021.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>seic2019proxystatementfi022.jpg
    <TEXT>
    Document 25 - file: seic2019proxystatementfi022.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>seic2019proxystatementfi023.jpg
    <TEXT>
    Document 26 - file: seic2019proxystatementfi023.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>seic2019proxystatementfi024.jpg
    <TEXT>
    Document 27 - file: seic2019proxystatementfi024.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>seic2019proxystatementfi025.jpg
    <TEXT>
    Document 28 - file: seic2019proxystatementfi025.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>seic2019proxystatementfi026.jpg
    <TEXT>
    Document 29 - file: seic2019proxystatementfi026.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>seic2019proxystatementfi027.jpg
    <TEXT>
    Document 30 - file: seic2019proxystatementfi027.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>seic2019proxystatementfi028.jpg
    <TEXT>
    Document 31 - file: seic2019proxystatementfi028.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>seic2019proxystatementfi029.jpg
    <TEXT>
    Document 32 - file: seic2019proxystatementfi029.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>seic2019proxystatementfi030.jpg
    <TEXT>
    Document 33 - file: seic2019proxystatementfi030.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>seic2019proxystatementfi031.jpg
    <TEXT>
    Document 34 - file: seic2019proxystatementfi031.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>seic2019proxystatementfi032.jpg
    <TEXT>
    Document 35 - file: seic2019proxystatementfi032.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>seic2019proxystatementfi033.jpg
    <TEXT>
    Document 36 - file: seic2019proxystatementfi033.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>37
    <FILENAME>seic2019proxystatementfi034.jpg
    <TEXT>
    Document 37 - file: seic2019proxystatementfi034.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>38
    <FILENAME>seic2019proxystatementfi035.jpg
    <TEXT>
    Document 38 - file: seic2019proxystatementfi035.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>39
    <FILENAME>seic2019proxystatementfi036.jpg
    <TEXT>
    Document 39 - file: seic2019proxystatementfi036.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>40
    <FILENAME>seic2019proxystatementfi037.jpg
    <TEXT>
    Document 40 - file: seic2019proxystatementfi037.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>41
    <FILENAME>seic2019proxystatementfi038.jpg
    <TEXT>
    Document 41 - file: seic2019proxystatementfi038.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>42
    <FILENAME>seic2019proxystatementfi039.jpg
    <TEXT>
    Document 42 - file: seic2019proxystatementfi039.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>43
    <FILENAME>seic2019proxystatementfi040.jpg
    <TEXT>
    Document 43 - file: seic2019proxystatementfi040.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>44
    <FILENAME>seic2019proxystatementfi041.jpg
    <TEXT>
    Document 44 - file: seic2019proxystatementfi041.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>45
    <FILENAME>seic2019proxystatementfi042.jpg
    <TEXT>
    Document 45 - file: seic2019proxystatementfi042.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>46
    <FILENAME>seic2019proxystatementfi043.jpg
    <TEXT>
    Document 46 - file: seic2019proxystatementfi043.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>47
    <FILENAME>seic2019proxystatementfi044.jpg
    <TEXT>
    Document 47 - file: seic2019proxystatementfi044.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>48
    <FILENAME>seic2019proxystatementfi045.jpg
    <TEXT>
    Document 48 - file: seic2019proxystatementfi045.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>49
    <FILENAME>seic2019proxystatementfi046.jpg
    <TEXT>
    Document 49 - file: seic2019proxystatementfi046.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>50
    <FILENAME>seic2019proxystatementfi047.jpg
    <TEXT>
    Document 50 - file: seic2019proxystatementfi047.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>51
    <FILENAME>seic2019proxystatementfi048.jpg
    <TEXT>
    Document 51 - file: seic2019proxystatementfi048.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>52
    <FILENAME>seinwnaka36.jpg
    <TEXT>
    Document 52 - file: seinwnaka36.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>