Korn Ferry International Inc. (NYSE: KFY) ranks as the largest retained search firm in the US in terms of retained search revenue last year, according to Staffing Industry Analysts’ 2016 report on the largest retained search firms. Spencer Stuart ranked second, followed by Heidrick & Struggles International Inc. (NASD: HSII).

Eight firms each generated at least $25 million in retained search revenue in 2015. Combined, they generated $1.6 billion in such revenue and comprised an estimated 25% of the market.

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