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Milwaukee is the home to the international headquarters of five Fortune 500 companies: Johnson Controls, Northwestern Mutual, Manpower, Rockwell Automation, and Harley-Davidson. Other companies based in Milwaukee include Briggs & Stratton, Brady Corporation, Sensient Technologies, A. O. Smith, Rexnord, Master Lock, Marcus Corporation, REV Group, American Signal Corporation, GE Healthcare Diagnostic Imaging and Clinical Systems. The Milwaukee metropolitan area ranks fifth in the United States in terms of the number of Fortune 500 company headquarters as a share of the population. Milwaukee also has a large number of financial service firms, particularly those specializing in mutual funds and transaction processing systems, and a number of publishing and printing companies.