NASCAR Holdings, an American auto racing league, completed the $2bn acquisition of International Speedway Corporation, a promoter of motorsports activities. International Speedway Corporation is a leading promoter of motorsports activities, currently promoting more than 100 racing events annually as well as numerous other motorsports-related activities. ISC owns and/or operates 13 of the nation's major motorsports entertainment facilities including Daytona International Speedway® in Florida (home of the DAYTONA 500®). ISC also owns and operates Motor Racing NetworkSM, the nation's largest independent sports radio network.