0001193125-08-120013 8-K 3 20080520 1.01 5.02 8.01 9.01 20080521 20080521 SEI INVESTMENTS CO 0000350894 6211 231707341 PA 1231 8-K 34 000-10200 08851699 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100 6106761000 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100 SEI INVESTMENT CO 20040806 SEI CORP 19920703 8-K 1 d8k.htm SEI INVESTMENTS CO--FORM 8-K EX-10.11 2 dex1011.htm AMENDED AND RESTATED EMPLOYEE STOCK PURCHASE PLAN EX-99.1 3 dex991.htm PRESS RELEASE