State Street Corporation filed a Schedule 13G with the SEC on November 10, 2026, disclosing beneficial ownership of 7,570,589 shares of Biogen Inc. common stock, representing 5.1% of the class, as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: State Street Corporation reported beneficial ownership of 7,570,589 shares of Biogen Inc. common stock.
  • Percent of class: The reported stake represents 5.1% of Biogen's outstanding common stock.
  • Shared voting power: State Street disclosed shared power to vote or direct the vote for 4,863,692 shares.
  • Shared dispositive power: The filing reports shared power to dispose or direct the disposition of 7,562,236 shares.
  • Sole voting and dispositive power: State Street reported 0 shares subject to sole voting power and 0 shares subject to sole dispositive power.
  • Triggering date: The event requiring the filing occurred on September 30, 2026.
  • Subsidiaries involved: The filing identifies eleven subsidiaries, including SSGA Funds Management, Inc. and State Street Bank and Trust Company, as the entities through which the securities were acquired.

State Street's Schedule 13G Filing on Biogen Common Stock

State Street Corporation, a holding company incorporated in Massachusetts with its principal office at One Congress Street, Suite 1, Boston, MA 02114, filed a Schedule 13G disclosing a position in Biogen Inc. (NASDAQ:BIIB) common stock (CUSIP 09062X103). According to the filing, the event triggering the disclosure occurred on September 30, 2026, and the statement was signed by Alok Maheshwary, Senior Vice President, on November 9, 2026.

The filing reports that State Street beneficially owns 7,570,589 shares in aggregate, equal to 5.1% of the class. Of that total, the company disclosed shared voting power over 4,863,692 shares and shared dispositive power over 7,562,236 shares. Sole voting and sole dispositive power are each reported as zero. The filing identifies State Street as a parent holding company filing under Rule 13d-1(b)(1)(ii)(G).

The filing lists eleven subsidiaries through which the securities are held, including SSGA Funds Management, Inc. (classified as an investment adviser), State Street Bank and Trust Company (classified as a bank), and multiple State Street Global Advisors entities operating across Japan, Asia, Europe, Singapore, Australia, and Saudi Arabia. The certification states that the securities "were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer."

What Was Disclosed

State Street Corporation disclosed a 5.1% beneficial ownership position in Biogen Inc. common stock, totaling 7,570,589 shares as of September 30, 2026, held through eleven subsidiaries with shared voting and dispositive powers and no sole voting or dispositive authority.