0000350894-04-000047 4 1 20040319 20040322 WITHROW WAYNE 0001191733 4 34 000-10200 04682306 SEI INVESTMENT INC ONE FREEDOM VALLEY OAKS PA 19456 SEI CORP 0000350894 6211 231707341 PA 1231 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100 6106761000 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100 4 1 edgar.xml PRIMARY DOCUMENT