Form 8-K Filing by Affiliated Managers Group, Inc.

Affiliated Managers Group, Inc. held its Annual Meeting of Stockholders on May 27, 2026. The stockholders elected directors, with all nominees receiving at least 97% of the votes cast. The compensation of the named executive officers was approved by a non-binding advisory vote with 98% of the votes cast in favor. Additionally, the selection of PricewaterhouseCoopers LLP as the company's independent registered public accounting firm for the current fiscal year was ratified, with 94% of the votes cast in favor. The filing details the voting results for each proposal, including votes for, against, abstentions, and broker non-votes.