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Indianapolis has a diverse economy, relying on trade, transportation, and utilities, professional and business services, education and health services, government, retail trade, leisure and hospitality, and manufacturing. Three Fortune 500 companies are based in the city: Anthem Inc., Eli Lilly and Company, and Calumet Specialty Products Partners. Indianapolis hosts several notable sporting events annually, including the Brickyard 400, Grand Prix of Indianapolis, NFL Scouting Combine, the largest half marathon in the U.S., and the largest single-day sporting event in the world, the Indianapolis 500. The cars competing in the latter race are known as IndyCars as a reference to the event. As headquarters for the National Collegiate Athletic Association (NCAA), the city frequently hosts the Men's and Women's basketball tournaments. Indianapolis hosted Pan American Games X in 1987 and Super Bowl XLVI in 2012.