SEC Filing Summary

This filing details transactions made by Loren M. Starr, a director at Affiliated Managers Group, Inc. On July 30, 2026, Starr acquired 411 Stock Units and 210 Deferred Stock Units. These units are linked to the company's common stock. The Stock Units vest on August 15, 2027, and the Deferred Stock Units become distributable upon Starr's separation from the Board of Directors. All transactions were reported under Form 4 and are marked as direct ownership.