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SEC FORM 4 SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 		 
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
WEST ALFRED P JR
(Last) (First) (Middle)
ONE FREEDOM VALLEY DRIVE
(Street)
OAKS PA 19456
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
SEI CORP [ SEIC ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director X 10% Owner
X Officer (give title below) Other (specify below)
Chairman and Chief Executive
3. Date of Earliest Transaction (Month/Day/Year)
07/29/2004
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 07/29/2004 G V 32,611 D $0(5) 11,406,428 D
Common Stock 24,000 I By Wife
Common Stock 4,537,500 I By AP West Associates, LP(1)
Common Stock 246,298 I By 1980 Minority Trust - Alfred P. West, III(2)
Common Stock 07/29/2004 S 3,264 D $30.54 211,727 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 2,829 D $30.56 208,898 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 1,523 D $30.57 207,375 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 6,528 D $30.63 200,847 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 5,440 D $30.75 195,407 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 6,528 D $30.76 188,879 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 4,352 D $30.77 184,527 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 2,176 D $30.79 182,351 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 5,440 D $31 176,951 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 5,440 D $31.01 171,511 I By 1980 Minority Trust - Andrew Palmer West(2)
Common Stock 07/29/2004 S 4,236 D $30.54 181,228 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 07/29/2004 S 3,671 D $30.56 177,557 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 07/29/2004 S 1,977 D $30.57 175,580 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 07/29/2004 S 8,472 D $30.63 167,108 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 07/29/2004 S 7,060 D $30.75 160,048 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 07/29/2004 S 8,472 D $30.76 151,576 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 07/29/2004 S 5,648 D $30.77 145,928 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 07/29/2004 S 2,824 D $30.79 143,104 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 07/29/2004 S 7,060 D $31 136,044 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 07/29/2004 S 7,060 D $31.01 128,984 I By 1980 Minority Trust - Angela Paige West(2)
Common Stock 1,398,000 I By 1980 Life Trust - Alfred P. West, III(2)
Common Stock 1,405,295 I By 1980 Life Trust - Andrew Palmer West(2)
Common Stock 1,400,735 I By 1980 Life Trust - Angela Paige West(2)
Common Stock 66,692 I By Residuary Trust(3)
Common Stock 32,200 I By West Senior Securities Fund, L.P.(4)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. Mr. West disclaims beneficial ownership of the shares held by AP West Associates, L.P., except to the extent of his pecuniary interest therein.
2. These shares are held in trusts for the benefit of Mr. West's children. Mr. West's wife is the trustee or a co-trustee of these trusts. Mr. West disclaims beneficial ownership of the shares held in these trusts.
3. The trust that holds these shares (the "Residuary Trust") is for the benefit of Mr. West's mother and certain descendants of Mr. West's father. The Residuary Trust was created upon the death of Mr. West's father under the terms of an existing trust that Mr. West's father had established prior to his death. In connection with the establishment of the Residuary Trust, Mr. West became the trustee of the Residuary Trust in September 2002. Mr. West disclaims beneficial ownership of the shares held by the Residuary Trust, except to the extent of his pecuniary interest therein.
4. West Senior Securities Fund, L.P. is a limited partnership in which the Residuary Trust, of which Mr. West is trustee, holds a 1% general partnership interest and a 9.5% limited partnership interest. Mr. West disclaims beneficial ownership of the shares held by West Senior Securities Fund, L.P., except to the extent of his pecuniary interest therein.
5. Not applicable - Gift Transfer
Remarks:
Jill B. Geisenheimer (Attorney-in-fact) 08/02/2004
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
POWER OF ATTORNEY



KNOW ALL BY THESE PRESENTS, THAT THE UNDERSIGNED HEREBY CONSTITUTES AND APPOINTS


EACH OF JILL GEISENHEIMER, SOFIA ROSALA AND N. JEFFREY KLAUDER SIGNING SINGLY,


THE UNDERSIGNED'S TRUE AND LAWFUL ATTORNEY-IN-FACT TO:



(1) execute for and on behalf of the undersigned, in the undersigned's capacity

as an officer and/or director of SEI Investment Company (the "Company"),

Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities

Exchange Act of 1934 and the rules thereunder;


(2) do and perform any and all acts for and on behalf of the undersigned which

may be necessary or desirable to complete and execute any such Form 3, 4 or

5 and and timely file such form with the United States Securities and

Exchange Commission and any stock exchange or other similar authority; and



(3) take any other action of any type whatsoever in connection with the

foregoing which, in the opinion of such attorney-in-fact, may be of benefit to,

in the best interest of, or legally required by, the undersigned, it being

understood that the documents executed by such attorney-in-fact on

behalf of the undersigned pursuant to this Power of Attorney shall be in such

form and shall contain such terms and conditions as such attorney-in-fact may

approve in such attorney-in-fact's discretion.



The undersigned hereby grants to each such attorney-in-fact full power and

authority to do and perform any and every act and thing whatsoever requisite,

necessary, or proper to be done in the exercise of any of the rights and powers

herein granted, as fully to all intents and purposes as the undersigned

might or could do if personally present, with full power of substitution or

revocation, hereby ratifying and confirming all that such attorney-in-fact, or

such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to

be done by virtue of this power of attorney and the rights and powers herein

granted.  The undersigned acknowledges that the foregoing attorneys-in-fact,

in serving in such capacity at the request of the undersigned, are not assuming,

nor is the Company assuming, any of the undersigned's responsibilities to comply

with Section 16 of the Securities Exchange Act of 1934.



This Power of Attorney shall remain in full force and effect until the

undersigned is no longer required to file Forms 3, 4, and 5 with respect to the

undersigned's holdings of and transactions in securities issued by the Company,

unless earlier revoked by the undersigned in a signed writing delivered to the

foregoing attorneys-in-fact.



IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be

executed as of this 20 day of July, 2004.

                                                       /S/ Alfred P. West
                                                       Signature

                                                       Alfred P. West
                                                       Print Name