{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-26-076911","form_type":"8-K","ticker":"AMG","cik":"0001004434","company_name":"AFFILIATED MANAGERS GROUP, INC.","filed_at":"2026-02-26T23:59:59+00:00","discovered_at":"2026-05-14T18:02:34.372846+00:00","generated_at":"2026-05-15T23:21:55.960110+00:00","sec_items":["5.02","7.01","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.6,"calibrated_materiality_score":0.6,"confidence":"high","headline":"AMG appoints G. Staley Cates to board; Alvingham to retire; Horgen re-appointed President","bullets":["G. Staley Cates appointed as independent director of AMG, effective April 1, 2026.","Karen L. Alvingham to retire from the Board of Directors, effective April 1, 2026.","Jay C. Horgen re-appointed as President of AMG, effective April 1, 2026, while continuing as CEO.","Cates served as Vice Chairman of Southeastern Asset Management from 2015 to 2024 and is a CFA."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-26-076911","json":"https://secwatch.observer/filing/0001193125-26-076911.json","markdown":"https://secwatch.observer/filing/0001193125-26-076911.md","text":"https://secwatch.observer/filing/0001193125-26-076911.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1004434/000119312526076911/0001193125-26-076911-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1004434/000119312526076911/d113085d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud","generated_at":"2026-05-15T23:21:55.960110+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":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}