Joining a crowd of positive reports on law firms’ first half financial performance, Wells Fargo Private Bank said on Tuesday that the first half was a surprising financial success for law firms, largely thanks to the performance of the largest and most profitable among them.

Revenue rose 5.6 percent compared to the same period a year ago at the 135 firms surveyed by Wells Fargo. The Am Law 50 led the way with 7 percent growth, compared to 6.6 percent for Am Law 100 firms and just under 3 percent for Am Law 200 firms included in the survey.