13F Insight
DOSSIER · 13F Holders · Q1 2026Healthcare · Biological Products, (No Diagnostic Substances)CyclicalNet sold
BIIB

BIOGEN INC

1,053 institutions still hold BIOGEN INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 09062X103·Biological Products, (No Diagnostic Substances)·1,053 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 0.9%
vs prior quarter
13F value held
$17.0B
48.0% inst. owned
of float
Holders
1,053
-50 QoQ
filers reporting
Activity
+8 / −70
+878 added · −748 reduced
this quarter
Concentration
17.23%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

1,053 institutions reported BIIB in Q1 2026. BlackRock, Inc. leads at 17.2% of the visible book. -50 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$2.9B16.0M0.05%Q1 202602
PRIMECAP MANAGEMENT CO/CA/
CIK 0000763212
$2.7B14.8M2.13%Q1 202603
FMR LLC
CIK 0000315066
$2.3B12.8M0.12%Q1 202604
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$1.7B9.5M0.04%Q1 202605
STATE STREET CORP
CIK 0000093751
$1.3B7.2M0.05%Q1 202606
Vanguard Portfolio Management
CIK 0002100121· Index
$1.2B6.5M0.06%Q1 202607
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$793M4.3M0.05%Q1 202608
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$543M3.0M0.10%Q1 202609
MORGAN STANLEY
CIK 0000895421
$398M2.2M0.02%Q1 202610
JPMORGAN CHASE & CO
CIK 0000019617
$378M2.0M0.02%Q1 202611
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
$346M1.9M0.16%Q1 202612
Invesco Ltd.
CIK 0000914208
$320M1.7M0.05%Q1 202613
Boston Partners
CIK 0001386060
$312M1.7M0.33%Q1 202614
NORTHERN TRUST CORP
CIK 0000073124· Index
$265M1.4M0.04%Q1 202615
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$263M1.4M0.03%Q1 202616
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
CIK 0000861177
$253M1.4M0.05%Q1 202617
Legal & General Group Plc
CIK 0000764068
$247M1.3M0.06%Q1 202618
GOLDMAN SACHS GROUP INC
CIK 0000886982
$216M1.2M0.02%Q1 202619
BANK OF AMERICA CORP /DE/
CIK 0000070858
$212M1.2M0.02%Q1 202620
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$211M1.1M0.03%Q1 2026
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