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CITADEL ADVISORS LLC

Position in BIIB — Biogen Inc.

CIK 1423053 MIAMI, FL

Position in BIIB

as of Jun 30, 2026 · filed Sep 2, 2026
Position Value
$90,389,997
+$65,073,409 QoQ
Shares Held
418,356
+203.0% QoQ
Ownership
0.283%
of shares outstanding
% of Portfolio
0.06%
of 13F equity value
Holder Rank
#44
of 1,037 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in BIIB Over Time

Shares Held

Position Value (USD)

Derivatives in BIIB

reported options exposure · as of Jun 30, 2026
CallValue
$68,058,900
CallShares
315,000
PutValue
$28,995,252
PutShares
134,200

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Drug Manufacturers - General

Healthcare · as of Jun 30, 2026

CITADEL ADVISORS LLC holds $3,979,998,649 across 21 Drug Manufacturers - General names. BIIB ranks #10 (2.3% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in BIIB

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $90,389,997 418,356
2026-06-30 $68,058,900 315,000
2026-06-30 $28,995,252 134,200
2026-03-31 $16,994,691 92,700
2026-03-31 $54,980,667 299,900
2026-03-31 $25,316,588 138,093
2025-12-31 $71,627,930 407,000
2025-12-31 $7,114,219 40,424
2025-12-31 $28,510,380 162,000
2025-09-30 $22,132,640 158,000
2025-09-30 $52,211,738 372,728
2025-09-30 $33,787,296 241,200
2025-06-30 $59,416,629 473,100
2025-06-30 $76,432,818 608,590
2025-06-30 $33,130,642 263,800
2025-03-31 $74,134,985 541,764
2025-03-31 $28,202,724 206,100
2025-03-31 $136,621,056 998,400
2024-12-31 $26,363,408 172,400
2024-12-31 $36,502,004 238,700
2024-12-31 $23,497,687 153,660
2024-09-30 $29,289,224 151,100
2024-09-30 $72,179,424 372,366
2024-09-30 $20,895,952 107,800
2024-06-30 $36,720,288 158,400
2024-06-30 $26,983,848 116,400
2024-03-31 $32,193,127 149,298
2024-03-31 $28,355,345 131,500
2024-03-31 $26,738,120 124,000
2023-12-31 $62,777,602 242,600
2023-12-31 $1,361,388 5,261
2023-12-31 $47,484,295 183,500
2023-09-30 $20,081,733 78,136
2023-09-30 $76,152,063 296,300
2023-09-30 $63,532,872 247,200
2023-06-30 $105,907,230 371,800
2023-06-30 $106,989,660 375,600
2023-03-31 $148,718,247 534,900
2023-03-31 $145,826,735 524,500
2023-03-31 $68,140,703 245,084
2022-12-31 $274,510,796 991,300
2022-12-31 $242,471,152 875,600
2022-12-31 $68,624,098 247,812
2022-09-30 $66,583,926 249,378
2022-09-30 $353,694,900 1,324,700
2022-09-30 $373,346,100 1,398,300
2022-06-30 $113,125,518 554,700
2022-06-30 $119,162,142 584,300
2022-06-30 $42,509,865 208,443
2022-03-31 $100,056,060 475,100