Automatic Data Processing Inc

Automatic Data Processing (ADP) processes payroll and provides HR-related services to businesses of all sizes, from small companies to large enterprises. Customers pay for software and services covering payroll processing, tax compliance, benefits administration, talent management, and retirement plans. ADP also offers a professional employer organization (PEO) model, where it co-employs clients' workers and handles HR functions on their behalf. Revenue comes primarily from service fees and, secondarily, from interest earned on client funds held between collection and remittance. ADP serves over 1.1 million clients and processes payroll for more than 42 million workers across 140 countries.