Aerotek, a division of Allegis Group, ranks as the largest supplier of engineering staffing in the US in terms of engineering temporary staffing revenue, according to a new report released by Staffing Industry Analysts. The annual list of largest US engineering staffing firms includes companies with at least $50 million in the US engineering staffing segment in 2016. This year’s list includes 23 firms, which combined generated $5.0 billion in such revenue and account for 65% market share.

The five largest engineering staffing firms in the US and their estimated 2016 staffing revenue are:

1. Aerotek (Allegis Group): $1.3 billion, 18% market share
2. ENTEGEE (Adecco): $679 million, 9% market share
3. System One: $420 million, 5% market share
4. Kelly Services: $377 million, 5% market share
5. CDI Corp.: $230 million, 3% market share

Corporate members of Staffing Industry Analysts can download the full report online.