Biogen Inc. is a global biotechnology company. The Company is focused on discovering, developing and delivering therapies for people living with serious and complex diseases worldwide. It has a portfolio of medicines to treat multiple sclerosis (MS), spinal muscular atrophy (SMA) and Alzheimer's disease. It is focused on advancing its pipeline in neurology, neuropsychiatry, specialized immunology and rare diseases. Its marketed products include TECFIDERA, VUMERITY, AVONEX, PLEGRIDY, TYSABRI and FAMPYRA for the treatment of MS; SPINRAZA for the treatment of SMA; ADUHELM for the treatment of Alzheimer's disease, and FUMADERM for the treatment of severe plaque psoriasis. It is also advancing its mid-to-late stage programs, including zuranolone for major depressive disorder (MDD) and postpartum depression (PPD), BIIB080 for Alzheimer's disease, tofersen for amyotrophic lateral sclerosis (ALS) and both litifilimab and dapirolizumab pegol for certain forms of lupus.