Biogen Chair Stelios Papadopoulos to step down; Caroline D. Dorsa elected as new Chair

BIOGEN INC.

Stelios Papadopoulos will not stand for re-election at the 2023 Annual Meeting; departure unrelated to any disagreement with Board or Company.
Board elected Caroline D. Dorsa to serve as Chair of the Board, effective after the Annual Meeting.
Papadopoulos' decision is a planned succession; no operational or policy disputes cited.

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