0001193125-08-198525 8-K 2 20080919 8.01 9.01 20080919 20080919 SEI INVESTMENTS CO 0000350894 6211 231707341 PA 1231 8-K 34 000-10200 081080044 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 FORM 8-K EX-99.1 2 dex991.htm SEI INVESTOR NOTICE