-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 LJR20cLiNN4B9ttqsF4czx/jc9Ma7ZNeh+Orewgqzyk156MdpD/hkNBqAWgnHn/N
 dFoDxYhI6xj1p+v6SgBilQ==

<SEC-DOCUMENT>0001193125-04-041807.txt : 20040315
<SEC-HEADER>0001193125-04-041807.hdr.sgml : 20040315
<ACCEPTANCE-DATETIME>20040315121014
ACCESSION NUMBER:		0001193125-04-041807
CONFORMED SUBMISSION TYPE:	10-K
PUBLIC DOCUMENT COUNT:		9
CONFORMED PERIOD OF REPORT:	20031231
FILED AS OF DATE:		20040315

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEI CORP
		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-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10200
		FILM NUMBER:		04668422

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>10-K
<SEQUENCE>1
<FILENAME>d10k.htm
<DESCRIPTION>FOR THE PERIOD ENDED DECEMBER 31, 2003
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.19.2
<SEQUENCE>3
<FILENAME>dex10192.htm
<DESCRIPTION>SECOND AMENDMENT TO THE LOAN AGREEMENT
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-14
<SEQUENCE>4
<FILENAME>dex14.htm
<DESCRIPTION>CODE OF ETHICS
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-21
<SEQUENCE>5
<FILENAME>dex21.htm
<DESCRIPTION>SUBSIDIARIES OF THE REGISTRANT
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>6
<FILENAME>dex231.htm
<DESCRIPTION>CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>7
<FILENAME>dex311.htm
<DESCRIPTION>SECTION 302 CEO CERTIFICATION
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>8
<FILENAME>dex312.htm
<DESCRIPTION>SECTION 302 CFO CERTIFICATION
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-32
<SEQUENCE>9
<FILENAME>dex32.htm
<DESCRIPTION>SECTION 906 CEO & CFO CERTIFICATIONS
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>10
<FILENAME>dex991.htm
<DESCRIPTION>MISCELLANEOUS EXHIBIT
</DOCUMENT>
</SUBMISSION>