Chicago’s Mayer, Brown, Rowe & Maw has announced a major restructuring calling for the termination — or “de-equitization” — of 45 of its partners, around 10 percent of its total.

A spokesman for the 1,500-lawyer firm said the move, first reported in the Chicago Tribune, primarily affected U.S. partners, but he declined to name them or break down the impact of the move by office or practice area.