Staffing Industry Analysts released this year’s list of largest U.S. industrial staffing firms. The list includes 32 staffing firms with $100 million or more in 2013 U.S. temporary staffing revenue generated in the industrial skill segment.

The 32 firms on the list combined to generate $19.2 billion, which accounted for 65 percent of the total market.

“We note that from 2007 to 2013, the five largest and 15 largest firms have steadily increased their share of the total market, indicating a steady trend of increasing consolidation in the industrial staffing industry,” the report states. “In 2014, TrueBlue’s acquisition of The Seaton Companies represents further consolidation in the segment and continuation of the trend.”

The five largest industrial staffing firms in the U.S. and their estimated 2013 U.S. staffing revenue are:

1. Express Employment Professionals: $1.77 billion, 6 percent market share
2. Aerotek (Allegis Group): $1.74 billion, 6 percent market share
3. The Select Family of Staffing Companies: $1.70 billion, 6 percent market share
4. Manpower: $1.64 billion, 6 percent market share
5. TrueBlue: $1.62 billion, 5 percent market share

Corporate members of Staffing Industry Analysts can download the full report by clicking here.