{"url_path":"/sec/biib/8-k/2026-06-10/cover-page","section_key":"cover-page","section_title":"Cover Page","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-06-10","source_url":"https://www.sec.gov/Archives/edgar/data/875045/0000950157-26-000700-index.html","accession_number":"0000950157-26-000700","cik":"0000875045","ticker":"BIIB","issuer_name":"BIOGEN INC.","edgar_url":"https://www.sec.gov/Archives/edgar/data/875045/0000950157-26-000700-index.html","primary_entity_key":"0000875045","primary_entity_name":"BIOGEN INC."},"word_count":310,"has_tables":true,"body_markdown":"false\n0000875045\n\n0000875045\n\n2026-06-09\n2026-06-09\n\niso4217:USD\n\nxbrli:shares\n\niso4217:USD\n\nxbrli:shares\n\n \n\n \n\n \n\n** **\n\n**UNITED STATES**\n\n**SECURITIES AND EXCHANGE COMMISSION**\n\n**Washington, D.C. 20549**\n\n** **\n\n**FORM 8-K**\n\n** **\n\n**CURRENT REPORT**\n\n**Pursuant to Section 13 or 15(d) of The Securities\nExchange Act of 1934**\n\n** **\n\nDate of Report (Date of earliest event reported):\n**June 9, 2026**\n\n** **\n\n** **\n\n**Biogen Inc.**\n\n(Exact name of registrant as specified in its charter)\n\n \n\n**Delaware**\n**0-19311**\n**33-0112644**\n\n(State or other jurisdiction of incorporation)\n(Commission File Number)\n(IRS Employer Identification No.)\n\n \n\n**225 Binney Street, Cambridge, Massachusetts 02142**\n\n(Address of principal executive offices; Zip Code)\n\n \n\nRegistrant’s telephone number, including area\ncode: **(617) 679-2000**\n\n \n\n**Not Applicable**\n\n(Former name or former address, if changed since\nlast report.)\n\n \n\nCheck the appropriate box below if the Form 8-K filing is intended to\nsimultaneously satisfy the filing obligation of the registrant under any of the following provisions:\n\n \n\n¨ Written\ncommunications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)\n\n¨ Soliciting\nmaterial pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)\n\n¨ Pre-commencement\ncommunications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))\n\n¨ Pre-commencement\ncommunications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))\n\n \n\nSecurities registered pursuant to Section 12(b) of the Act:\n\n \n\nTitle of each class\nTrading Symbol(s)\nName of each exchange on which registered\n\n**Common Stock, $0.0005 par value per share**\n**BIIB**\n**The Nasdaq Global Select Market**\n\n \n\nIndicate by check mark whether the registrant is an emerging growth\ncompany as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange\nAct of 1934 (§240.12b-2 of this chapter).\n\n \n\n¨ Emerging\ngrowth company\n\n \n\nIf an emerging\ngrowth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any\nnew or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨"}