The global advertising and marketing communications landscape is dominated by massive multinational holding companies that manage extensive networks of creative, media-planning, and public relations agencies worldwide. The top five industry giants leading global billings and revenues include WPP plc (headquartered in London), Omnicom Group (based in New York), Publicis Groupe (based in Paris), Interpublic Group or IPG (based in New York), and Dentsu Group (based in Tokyo). These conglomerates control thousands of specialized subsidiaries, providing integrated marketing services to the world's largest corporate brands.