BIIB: Financial results

Item 2.02 Results of Operations and Financial Condition. On October 28, 2026, Biogen Inc. issued a press release announcing its results of operations and financial condition for the third quarter ended September 30, 2026. A copy of the press release is furnished as Exhibit 99.1 and is incorporated herein by reference. The press release is being furnished pursuant to Item 2.02 of this Current Report on Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or otherwise subject to the liabilities of that Section, nor shall such document be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act. Item 9.01 Financial Statements and Exhibits. (d) Exhibits The exhibits listed below are furnished as part of this Current Report on Form 8-K. Exhibit No. Description 99.1 Biogen's press release dated October 28, 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. BIOGEN INC. By: /s/ Wendell Taylor Wendell Taylor Secretary Date: October 28, 2026