Milwaukee-based Manpower Group is the largest specialized firm in the fragmented global staffing industry. It serves each main staffing category (temporary, permanent, and project-based) and also offers a suite of HR outsourcing and outplacement services. Manpower generated 2018 revenue and operating income of $21.9 billion and $797 million, respectively. Roughly 88% of sales are generated outside the U.S. from operations in 80 countries. Its 30,000 employees served an estimated 600,000 clients and placed millions of people in 2018.