0001021408-01-509863 10-Q 1 20010930 20011113 SEI CORP 0000350894 6211 231707341 PA 1231 10-Q 34 000-10200 1782900 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100 6106761000 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100 10-Q 1 d10q.txt SEI CORPORATION FORM 10-Q