FMR LLC Increases Stake in Biogen Inc. to 11.3%

On June 5, 2026, FMR LLC filed a Schedule 13G/A with the SEC, reporting a significant increase in its stake in Biogen Inc. (BIIB). As of the event date on May 29, 2026, FMR LLC beneficially owns 16,652,974.82 shares of Biogen's common stock, representing 11.3% of the total shares outstanding. This is a substantial increase from its previously reported position of 12,807,541 shares. The filing identifies Abigail P. Johnson as a reporting person with dispositive power over the same number of shares due to her position within FMR LLC. FMR LLC reported sole dispositive power over all 16,652,974.82 shares and sole voting power over 15,060,090.91 shares. The securities were acquired in the ordinary course of business and are not held for the purpose of changing or influencing the control of the issuer. Various subsidiaries of FMR LLC, including Fidelity Management & Research Company LLC, are noted as beneficial owners of the reported shares. No other single person's interest in the common stock exceeds 5% of the total outstanding.