Aerotek (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 2015. This year’s list includes 25 firms with combined revenue of $5.2 billion, comprising 67% market share.

The five largest engineering staffing firms in the US and their estimated 2015 staffing revenue are:

1. Aerotek (Allegis Group): $1.3 billion, 17% market share
2. ENTEGEE (Adecco): $734 million, 10% market share
3. System One*: $385 million, 5% market share
4. Kelly Services: $407 million, 5% market share
5. CDI Corp.: $214 million, 3% market share

*Includes revenue from acquisition of Precision Resource Company in the fourth quarter of 2015.

Three firms are included on this year’s ranking that did not appear in last year’s report: Cenergy International (Cenergy Partners), Fircroft and Progressive Recruitment (SThree plc).

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