0000899171-03-000016 4 1 20030203 20030205 LEAHY CHRISTINE A 0001215336 OFFICER 4 904 GLENCOE DR GLENCOE IL 60022 8474656000 CDW COMPUTER CENTERS INC 0000899171 5961 363310735 IL 1231 4 34 000-21796 03539452 200 N MILWAUKEE AVE VERNON HILLS IL 60061 8474656000 200 N MILWAUKEE AVE VERNON HILLS IL 60061 4 1 form_4cl020403.htm CHRIS LEAHY STOCK OPTION GRANT