BIIB Short Interest

Short InterestModerate
Short Interest?5.5M
Days to Cover?4.7
Avg Daily Volume1.2M
Settlement Date2026-07-31
Short Volume Ratio (30 Day)Avg: 5,538.6%
2026-07-132026-08-032026-08-21
Latest Short Vol Ratio4,888.0%
Short Volume128.3K
Total Volume262.5K
Biogen (BIIB) โ€” Short Interest