5 Biggest Payroll Companies in the US

2. Automatic Data Processing, Inc. (NASDAQ:ADP)

Market Capitalization: $91.39 billion

Automatic Data Processing, Inc. (NASDAQ:ADP) is a management services company based in Roseland, New Jersey. The company has about 60,000 employees.

It is one of the leaders in the online payroll and human resources solutions area. Automatic Data Processing, Inc. (NASDAQ:ADP) provides cloud-based human capital management solutions as well.