{"schema_version":"secwatch.filing_event.v1","accession":"0000950157-26-000280","form_type":"8-K","ticker":"BIIB","cik":"0000875045","company_name":"BIOGEN INC.","filed_at":"2026-03-11T23:59:59+00:00","discovered_at":"2026-05-14T18:02:37.877095+00:00","generated_at":"2026-05-15T15:20:59.682790+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"Biogen Chief Legal Officer Susan H. Alexander to depart end of May 2026","bullets":["Susan H. Alexander, Chief Legal Officer, will leave Biogen effective end of May 2026.","Company has initiated a search to identify the next Chief Legal Officer.","No interim successor has been named at this time."],"urls":{"canonical":"https://secwatch.observer/filing/0000950157-26-000280","json":"https://secwatch.observer/filing/0000950157-26-000280.json","markdown":"https://secwatch.observer/filing/0000950157-26-000280.md","text":"https://secwatch.observer/filing/0000950157-26-000280.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/875045/000095015726000280/0000950157-26-000280-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/875045/000095015726000280/form8-k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-15T15:20:59.682790+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"}