{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-26-046803","form_type":"8-K","ticker":"BIIB","cik":"0000875045","company_name":"BIOGEN INC.","filed_at":"2026-02-11T23:59:59+00:00","discovered_at":"2026-05-14T18:02:37.876823+00:00","generated_at":"2026-05-16T03:27:56.368256+00:00","sec_items":["5.02","8.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"high","headline":"Biogen Chair Caroline Dorsa to step down; Dr. Maria C. Freire elected as new Chair","bullets":["Chair Caroline Dorsa will not stand for re-election at the 2026 Annual Meeting; decision unrelated to any disagreement.","Board elected Dr. Maria C. Freire to serve as Chair, effective after the Annual Meeting.","Dr. Freire's appointment marks an orderly transition of Board leadership."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-26-046803","json":"https://secwatch.observer/filing/0001193125-26-046803.json","markdown":"https://secwatch.observer/filing/0001193125-26-046803.md","text":"https://secwatch.observer/filing/0001193125-26-046803.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/875045/000119312526046803/0001193125-26-046803-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/875045/000119312526046803/d937279d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-16T03:27:56.368256+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"}