X0303 4 2009-06-18 0000350894 SEI INVESTMENTS CO SEIC 0001059374 WEST ALFRED P JR ONE FREEDOM VALLEY DRIVE OAKS PA 19456 1 0 1 0 Common Stock 2009-06-18 4 S 0 2790 17.55 D 16498018 D Common Stock 2009-06-18 4 S 0 18304 17.56 D 16479714 D Common Stock 2009-06-18 4 S 0 11942 17.57 D 16467772 D Common Stock 2009-06-18 4 S 0 12654 17.58 D 16455118 D Common Stock 2009-06-18 4 S 0 26433 17.59 D 16428685 D Common Stock 2009-06-18 4 S 0 24066 17.60 D 16404619 D Common Stock 2009-06-18 4 S 0 2894 17.61 D 16401725 D Common Stock 2009-06-18 4 S 0 800 17.62 D 16400925 D Common Stock 2009-06-18 4 S 0 117 17.63 D 16400808 D Ruth Montgomery (Attorney in fact) 2009-06-22