A surge in startup companies has boosted head counts at law firms in California’s Silicon Valley, and it’s fueled particularly big gains at Gunderson Dettmer Stough Villeneuve Franklin & Hachigian.

Gunderson Dettmer, with 217 lawyers, enjoyed a 26 percent increase in total head count in 2015, the fourth largest percentage increase among law firms on this year’s NLJ 500, The National Law Journal’s annual survey of the nation’s largest law firms.