<SEC-DOCUMENT>0000350894-19-000034-index.html : 20190621
<SEC-HEADER>0000350894-19-000034.hdr.sgml : 20190621
<ACCEPTANCE-DATETIME>20190621171000
ACCESSION NUMBER:		0000350894-19-000034
CONFORMED SUBMISSION TYPE:	11-K
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20181231
FILED AS OF DATE:		20190621
DATE AS OF CHANGE:		20190621

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:		11-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10200
		FILM NUMBER:		19912333

	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>11-K
<SEQUENCE>1
<FILENAME>seiform11-k12x31x18.htm
<DESCRIPTION>FORM 11-K
<TEXT>
Document 1 - file: seiform11-k12x31x18.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>2
<FILENAME>form11-kexhibit23112x31x18.htm
<DESCRIPTION>CONSENT OF KPMG LLP
<TEXT>
Document 2 - file: form11-kexhibit23112x31x18.htm

</DOCUMENT>
</SEC-DOCUMENT>