Biogen said on February February 11, 2026 that Board Chair Caroline Dorsa would not stand for re-election to the Board at the 2026 Annual Meeting of Stockholders (the "Annual Meeting") 2026.

1. 01

   Biogen said on February February 11, 2026 that Board Chair Caroline Dorsa would not stand for re-election to the Board at the 2026 Annual Meeting of Stockholders (the "Annual Meeting") 2026.

2. 02

   The company said Ms. Dorsa's decision not to stand for re-election was not related to any disagreement with the Board or the company on any matter relating to its operations, policies or practices.

3. 03

   Biogen said the Board elected Dr. Maria C. Friere as Chair of the Board on February 11, 2026, effective after the Annual Meeting.

4. 04

   The company reported the announcement of Ms. Dorsa's decision not to stand for re-election under Item 5.02 in this 8-K, and the election of Dr. Friere as Chair under Item 8.01 (Other Items).

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