0001186747-09-000023 4 1 20090521 20090526 20090526 MCCOY BILLY G 0001186750 4 34 001-12882 09852955 BOYD GAMING CORP 0000906553 7990 880242733 NV 1231 3883 HOWARD HUGHES PARKWAY NINTH FLOOR LAS VEGAS NV 89169 7027927200 3883 HOWARD HUGHES PARKWAY NINTH FLOOR LAS VEGAS NV 89169 BOYD GROUP 19941130 4 1 edgar.xml PRIMARY DOCUMENT