Automatic Data Processing, Inc. is one of the largest payroll and tax filing processors in the world, serving more than 550,000 clients. Although more than 60% of sales come from employer services, ADP also provides securities transaction processing to brokerage firms, and inventory and other computing and data services to more than 17,000 auto and truck dealers. Other offerings include accounting, auto collision estimates for insurers, employment background checks, desktop applications support, and business development training services.
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