X0202 4 2007-09-26 0000350894 SEI INVESTMENTS CO SEIC 0001101310 MCCARTHY KATHRYN ONE FREEDOM VALLEY DRIVE OAKS PA 19456 1 0 0 0 Common Stock 2007-09-26 4 M 0 36000 4.75 A 58600 D Common Stock 2007-09-26 4 S 0 600 26.26 D 58000 D Common Stock 2007-09-26 4 S 0 602 26.25 D 57398 D Common Stock 2007-09-26 4 S 0 300 26.23 D 57098 D Common Stock 2007-09-26 4 S 0 700 26.22 D 56398 D Common Stock 2007-09-26 4 S 0 1315 26.21 D 55083 D Common Stock 2007-09-26 4 S 0 100 26.20 D 54983 D Common Stock 2007-09-26 4 S 0 100 26.19 D 54883 D Common Stock 2007-09-26 4 S 0 700 26.18 D 54183 D Common Stock 2007-09-26 4 S 0 400 26.16 D 53783 D Common Stock 2007-09-26 4 S 0 423 26.15 D 53360 D Common Stock 2007-09-26 4 S 0 540 26.14 D 52820 D Common Stock 2007-09-26 4 S 0 1400 26.13 D 51420 D Common Stock 2007-09-26 4 S 0 700 26.12 D 50720 D Common Stock 2007-09-26 4 S 0 100 26.07 D 50620 D Common Stock 2007-09-26 4 S 0 500 26.05 D 50120 D Common Stock 2007-09-26 4 S 0 300 26.03 D 49820 D Common Stock 2007-09-26 4 S 0 600 26.01 D 49220 D Common Stock 2007-09-26 4 S 0 1700 26.00 D 47520 D Common Stock 2007-09-26 4 S 0 100 25.56 D 47420 D Common Stock 2007-09-26 4 S 0 4220 25.99 D 43200 D Common Stock 2007-09-26 4 S 0 600 25.98 D 42600 D Common Stock 2007-09-26 4 S 0 100 25.97 D 42500 D Common Stock 2007-09-26 4 S 0 500 25.96 D 42000 D Common Stock 2007-09-26 4 S 0 700 25.95 D 41300 D Common Stock 2007-09-26 4 D 0 200 25.93 D 41100 D Common Stock 2007-09-26 4 S 0 170 25.92 D 40930 D Common Stock 2007-09-26 4 S 0 100 25.91 D 40830 D Common Stock 2007-09-26 4 S 0 1300 25.90 D 39530 D Common Stock 2007-09-26 4 S 0 930 25.89 D 38600 D Stock Option (right to Buy) 4.75 2007-09-26 4 M 0 36000 0 D 2005-10-08 2008-10-08 Common Stock 36000 0 D On June 21, 2007 the common stock of SEI Investments Company split 2-for-1, resulting in the reporting person's ownership of 14,300 additional shares of common stock. Ruth Montgomery (Attorney in fact) 2007-09-28