BIIB holders · CITADEL ADVISORS LLC 13F · BIIB stock

CITADEL ADVISORS LLC Biogen Inc (BIIB) 13F holding

CITADEL ADVISORS LLC reported 299,900 BIIB shares valued at $54.98B as of 2026-03-31 (COM), Call. Cached 13F row, not a live tape.

Cached BIIB reports from CITADEL ADVISORS LLC
ReportSharesValueClass
2026-03-31299,900$54.98BCall
2026-03-3197,381$17.85BCOM
2026-03-3192,700$16.99BPut
2026-03-3140,712$7.46BCOM
2025-12-31407,000$71.63BCall
2025-12-31162,000$28.51BPut
2025-12-3136,034$6.34BCOM
2025-12-314,390$772.6MCOM
2025-09-30372,728$52.21BCOM
2025-09-30241,200$33.79BCall
2025-09-30158,000$22.13BPut
2025-06-30608,590$76.43BCOM
2025-06-30473,100$59.42BCall
2025-06-30263,800$33.13BPut

Not investment advice. Cached 13F row, not EDGAR XML.