{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-019350","form_type":"8-K","ticker":"AMG","cik":"0001004434","company_name":"AFFILIATED MANAGERS GROUP, INC.","filed_at":"2025-02-03T23:59:59+00:00","discovered_at":"2026-05-14T18:03:02.650129+00:00","generated_at":"2026-05-27T03:50:53.205867+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Director Reuben Jeffery III retires from AMG Board; Dwight Churchill named Chair","bullets":["Reuben Jeffery III retired from AMG Board effective January 30, 2025.","Dwight D. Churchill appointed as Chair of the Board.","No replacement director announced."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-019350","json":"https://secwatch.observer/filing/0001193125-25-019350.json","markdown":"https://secwatch.observer/filing/0001193125-25-019350.md","text":"https://secwatch.observer/filing/0001193125-25-019350.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1004434/000119312525019350/0001193125-25-019350-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1004434/000119312525019350/d844057d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-27T03:50:53.205867+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"6deb39a32e","claim":"Dwight D. Churchill was named as Chair of the Board at AFFILIATED MANAGERS GROUP, INC..","evidence_excerpt":"“On behalf of our Board and AMG’s management team, we thank Reuben for his distinguished service and strategic insights,” stated Dwight D. Churchill, who has been named Chair of the Board.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1004434/000119312525019350/0001193125-25-019350-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"named"},{"label":"Role","value":"Chair of the Board"}],"fact_type":"executive_change"},{"claim_id":"ce4612bb02","claim":"Reuben Jeffery III retired as Director at AFFILIATED MANAGERS GROUP, INC..","evidence_excerpt":"On January 30, 2025, Reuben Jeffery III notified Affiliated Managers Group, Inc. (“AMG”) of his decision to retire from the Board of Directors (the “Board”), effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1004434/000119312525019350/0001193125-25-019350-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"retired"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}