{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-117854","form_type":"8-K","ticker":"BIIB","cik":"0000875045","company_name":"BIOGEN INC.","filed_at":"2025-05-12T23:59:59+00:00","discovered_at":"2026-05-14T18:02:51.542649+00:00","generated_at":"2026-05-22T01:03:22.413557+00:00","sec_items":["8.01","9.01"],"event_type":"debt","sentiment":"neutral","materiality_score":0.55,"calibrated_materiality_score":0.55,"confidence":"high","headline":"Biogen issues $1.75B in three tranches of senior notes to refinance maturing 2025 debt","bullets":["$400M 5.050% notes due 2031, $650M 5.750% notes due 2035, $700M 6.450% notes due 2055.","Net proceeds, with cash on hand, will retire the outstanding $1.75B 4.050% Senior Notes due 2025.","Notes are senior unsecured; redeemable at par plus make-whole; 101% change-of-control put.","Underwriters: BofA Securities, Citigroup Global Markets, J.P. Morgan Securities."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-117854","json":"https://secwatch.observer/filing/0001193125-25-117854.json","markdown":"https://secwatch.observer/filing/0001193125-25-117854.md","text":"https://secwatch.observer/filing/0001193125-25-117854.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/875045/000119312525117854/0001193125-25-117854-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/875045/000119312525117854/d13940d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-22T01:03:22.413557+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"}