Biogen to Acquire RayThera for Up to $1B to Strengthen Immunology Pipeline
Biogen announced a definitive agreement to acquire RayThera Inc. for up to $1 billion, adding multiple small-molecule immunology assets including a lead candidate set to enter Phase 1 in early Q3 2026. Biogen will lead development, manufacturing and global commercialization after closing, which is anticipated in Q3 2026, with an upfront payment and milestone payments contingent on clinical/regulatory milestones, subject to customary closing conditions and regulatory approvals.











