Paychex, Inc. is a national provider of payroll, human resource, and employee benefit outsourcing solutions for small-to medium-sized businesses. The company has two reportable business segments: Payroll and Human Resource Services and Professional Employer Organization. Paychex''s Payroll segment is a national payroll processing and payroll taxpreparation service provided to small-to medium-sized business. The Professional Employer Organization segment provides human resource products and services.