<SEC-DOCUMENT>0000350894-22-000026-index.html : 20220429
<SEC-HEADER>0000350894-22-000026.hdr.sgml : 20220429
<ACCEPTANCE-DATETIME>20220429144602
ACCESSION NUMBER:		0000350894-22-000026
CONFORMED SUBMISSION TYPE:	10-Q/A
PUBLIC DOCUMENT COUNT:		5
CONFORMED PERIOD OF REPORT:	20220331
FILED AS OF DATE:		20220429
DATE AS OF CHANGE:		20220429

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:		10-Q/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10200
		FILM NUMBER:		22874107

	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>10-Q/A
<SEQUENCE>1
<FILENAME>seic-3312022form10xqa.htm
<DESCRIPTION>FORM 10-Q/A
<TEXT>
Document 1 - file: seic-3312022form10xqa.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.3
<SEQUENCE>2
<FILENAME>seic-331202210qaex313.htm
<DESCRIPTION>SECTION 302 CEO CERTIFICATION
<TEXT>
Document 2 - file: seic-331202210qaex313.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.4
<SEQUENCE>3
<FILENAME>seic-331202210qaex314.htm
<DESCRIPTION>SECTION 302 CFO CERTIFICATION
<TEXT>
Document 3 - file: seic-331202210qaex314.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-32.1
<SEQUENCE>4
<FILENAME>seic-331202210qaex321.htm
<DESCRIPTION>SECTION 906 CEO AND CFO CERTIFICATION
<TEXT>
Document 4 - file: seic-331202210qaex321.htm

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

</DOCUMENT>
</SEC-DOCUMENT>