BIIB reported its earnings on 2026-02-06, showcasing a revenue of 2.28B against an estimate of 2.21B, resulting in a 3.14% surprise. The EPS was 1.99, surpassing the expected 1.61 by 23.6%. The stock experienced a 8.53% price change on the earnings day and a 3.15% change over the next five days, reflecting market reactions to the results.