Staffing Industry Analysts released this year’s list of largest U.S. office/clerical staffing firms. The list includes 14 staffing firms with $100 million or more in 2012 U.S. temporary staffing revenue generated in the office/clerical skill segment.

These 14 firms combined to generate an estimated $7.5 billion, which comprised 42 percent of the total market.

“The office/clerical skill segment market is a very mature market and the long-term demand trend is downward, adjusting for inflation,” said Research Analyst Timothy Landhuis. “However, so far this year, government data has shown bill rates to be up more than 3 percent year-over-year, indicating some strength in demand. And indeed, this year’s list of largest office/clerical staffing firms highlights that the segment continues to generate significant business at leading firms.”

The top five largest office/clerical staffing firms in the U.S. and their 2012 U.S. staffing revenue are:

1. Aerotek (Allegis Group): $1.4 billion, 8 percent market share
2. Randstad: $1.3 billion, 7 percent market share
3. Adecco: $1.0 billion, 6 percent market share
4. Kelly Services: $766 million, 4 percent market share
5. ManpowerGroup: $650 million, 4 percent market share

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