JANE STREET GROUP, LLC's ownership history for BIIB

JANE STREET GROUP, LLC currently holds 10.5K shares with a market value of $1.9M. It started holding BIIB on 2024-09-30. At its peak, it held 202.6K shares on 2024-12-31. Its highest holding value was $31.0M on 2024-12-31. At its lowest, it held 5.3K shares on 2025-09-30, with a value of $748.0K on 2025-09-30. In the recent 180 days, JANE STREET GROUP, LLC has increased its shares by 5.1K. In the recent year, JANE STREET GROUP, LLC has decreased its shares by 26.8K.

It has also owned 1.1K contracts of calls, with the market value of the underlying securities totaling $19.9M on 2024-09-30. At its peak, it held 3.8K contracts of calls on 2025-09-30 and it owned calls with the market value of the underlying securities totaling $61.8M on 2025-12-31. At its lowest, it held 745 contracts of calls on 2024-09-30 and it owned calls with the market value of the underlying securities totaling $14.4M on 2024-09-30. In the recent 180 days, JANE STREET GROUP, LLC has decreased its holdings by 2.7K contracts. In the recent year, JANE STREET GROUP, LLC has decreased its holdings by 643 contracts.

It has also owned 1.7K contracts of puts, with the market value of the underlying securities totaling $31.5M on 2024-09-30. At its peak, it held 3.2K contracts of puts on 2025-06-30 and it owned puts with the market value of the underlying securities totaling $40.6M on 2025-06-30. At its lowest, it held 653 contracts of puts on 2024-09-30 and it owned puts with the market value of the underlying securities totaling $11.4M on 2024-12-31. In the recent 180 days, JANE STREET GROUP, LLC has decreased its holdings by 360 contracts. In the recent year, JANE STREET GROUP, LLC has increased its holdings by 8.4K contracts.