Speedway Motorsports, Inc. (SMI) is an American corporation that owns and manages racing facilities that host NASCAR, IndyCar Series, NHRA, World of Outlaws and other motor racing series. The company's headquarters are located at Charlotte Motor Speedway, in the suburbs of Charlotte, NC. SMI owns nine racing facilities with a combined seating capacity of approximately 885,000. In addition to operating racetracks, SMI owns Performance Racing Network (PRN), U.S