Its outstanding position as a global leader in financial and business services has attracted the headquarters and facilities of a substantial number of large international firms, making the metro-region a leading employer in financial and business-related activities in the US. Chicago is the global centre for derivatives, hosting the largest derivatives exchanges, and home to 57 headquarters in the Fortune 500, including Boeing, McDonald’s, Motorola Solutions, Discover Financial Services, Abbott and United Airlines. Professional and Business Services and Financial Activities combined represented 26.2% of total employment in the region in 2010 (Table 1.2).