Press Release

Addison Group Earns Top Spot on 6 U.S. & Global SIA Largest Firms in 2022

SIA Largest Staffing Firms Full List - All Six Categories

Founded in 1989, Staffing Industry Analysts (SIA) is the global advisor on staffing and workforce solutions. Our proprietary research covers all categories of employed and non-employed work including temporary staffing, independent contracting and other types of contingent labor.

SIA’s independent and objective analysis provides insights into the services and suppliers operating in the workforce solutions ecosystem, including staffing firms, managed service providers, recruitment process outsourcers, payrolling/compliance firms and talent acquisition technology specialists such as vendor management systems, online staffing platforms, crowdsourcing and online work services. We also provide training and accreditation with our unique Certified Contingent Workforce Professional (CCWP) program. For more about Staffing Industry Analysts (SIA) visit


Press and Media Inquiries.

This field is for validation purposes and should be left unchanged.

To arrange an interview, contact:

Mindy Konczal, Media & PR Manager