ADP is a large provider of human resource and payroll services, processing pay for 1 in 6 US employees. It has partnered with Concur since 1998 to provide travel and expense management solutions. Concur helps organizations control costs by automating expense reporting. As the leader in this area, Concur has over 15,000 clients with 15 million users. ADP trusts Concur due to its high client retention rate, commitment to innovation, and ability to deliver value through cost reduction, efficiency, and powerful reporting.