Staffing Firm Lists & Market Share

Trends in U.S. staffing market concentration and staffing firm rankings, 2007-2011

February 6, 2013

  • Portion of U.S. staffing market captured by top fifteen largest firms steadily increased by average of +2.3 percentage points from 2007-2011
  • Many staffing segment markets experienced a significant increase in concentration during the recession (2008-2009)
  • Allegis Group and Adecco maintained their... More

2012 Largest-, Fastest-growing Lists’ Late Additions, Updates

October 31, 2012

  • Three new firms identified
  • Five submitted corrected revenue data

The 2012 Book of Lists: A complete collection of staffing firm rankings and lists

August 9, 2012

  • Compilation of all 24 SIA annual lists in one sortable Excel workbook
  • Ranks hundreds of staffing firms' staffing revenue domestically, globally, and by staffing sector
  • Opportunity lists: fastest-growing, diversity, mentors/proteges, acquirers

2012 List of Largest Canadian Staffing Firms

August 7, 2012

  • Lists 23 companies with at least C$50M in Canadian staffing revenue
  • Top two:  Randstad, Adecco
  • Companies on list cumulatively represent 53% of the Canadian staffing market

2012 List of Largest U.S. PEO Firms

August 6, 2012

  • Lists 18 companies with at least $50M in U.S. PEO revenue
  • Top two:  Insperity, Automatic Data Processing
  • Companies on list cumulatively represent 56% of U.S. PEO market

2012 Mentor/Protégé List

August 3, 2012

  • List of companies interested in Mentor-Protégé programs
  • Includes specific segment, location, and contact details
  • List includes 17 potential mentors and 114 potential protégé firms

2012 List of Diversity Staffing Firms

August 1, 2012

  • Lists 169 diversity-owned staffing firms
  • Diversity defined as woman-owned, minority-owned, service-disabled veteran-owned, and HUBZone business among others

2012 List of Largest U.S. Clinical/Scientific Staffing Firms

August 1, 2012

  • Lists 15 companies with at least $25M in U.S. clinical/scientific staffing revenue
  • Top two:  Aerotek (Allegis Group), Kelly Services
  • Companies on list cumulatively represent 81% of U.S. clinical/scientific staffing market

2012 List of Largest U.S. Finance/Accounting Staffing Firms

July 31, 2012

  • Lists 11 companies with at least $50M in U.S. finance/accounting staffing revenue
  • Top two:  Robert Half International, Randstad Finance & Accounting
  • Companies on list cumulatively represent 57% of U.S. finance/accounting staffing market

2012 List of Largest U.S. Marketing/Creative Staffing Firms

July 31, 2012

  • Lists four companies with at least $25M in U.S. marketing/creative staffing revenue
  • Top two:  Aquent, Robert Half International
  • Companies on list cumulatively represent 37% of U.S. marketing/creative staffing market