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Biogen
BIIB

Overview Fund Activity

846 hedge funds and large institutions have $16.1B invested in Biogen in 2025 Q2 according to their latest regulatory filings, with 94 funds opening new positions, 336 increasing their positions, 257 reducing their positions, and 99 closing their positions.

Holders
846
Holders Change
-22
Holders Change %
-2.53%
% of All Funds
11.36%
Holding in Top 10
5
Holding in Top 10 Change
+3
Holding in Top 10 Change %
+150%
% of All Funds
0.07%
New
94
Increased
336
Reduced
257
Closed
99
Calls
$292M
Puts
$203M
Net Calls
+$88.9M
Net Calls Change
+$365M

Top Buyers

1
Point72 Asset Management
1
Point72 Asset Management
Connecticut
$481M
2
Norges Bank
2
Norges Bank
Norway
$284M
3
Alyeska Investment Group
3
Alyeska Investment Group
Illinois
$63.9M
4
Arrowstreet Capital
4
Arrowstreet Capital
Massachusetts
$78.4M
5
Fidelity Investments
5
Fidelity Investments
Massachusetts
$210M

Top Sellers

1
BlackRock
1
BlackRock
New York
$1.7B
2
T. Rowe Price Investment Management
2
T. Rowe Price Investment Management
Maryland
$175M
3
Amundi
3
Amundi
France
$77.2M
4
SG Americas Securities
4
SG Americas Securities
New York
$2.82M
5
Qube Research & Technologies (QRT)
5
Qube Research & Technologies (QRT)
United Kingdom
$93.4M
Name Market Value Shares Shares
Change 		Shares
Change %
BNP Paribas Financial Markets
51
BNP Paribas Financial Markets
France
$49.6M 394,999 +28,818 +8%
Prudential Financial
52
Prudential Financial
New Jersey
$48.7M 387,829 -32,820 -8%
NL
53
Nuveen LLC
North Carolina
$42.9M 341,659 +195,228 +133%
California Public Employees Retirement System
54
California Public Employees Retirement System
California
$42.6M 339,050 -46,044 -12%
TSW
55
Thompson Siegel & Walmsley
Virginia
$40.6M 323,018 +65,562 +25%
PCM
56
Patient Capital Management
Maryland
$40.2M 320,466 -135,139 -30%
RhumbLine Advisers
57
RhumbLine Advisers
Massachusetts
$37.7M 300,147 +3,853 +1%
Mitsubishi UFJ Asset Management
58
Mitsubishi UFJ Asset Management
Japan
$37M 294,269 +20,721 +8%
SOMRS
59
State of Michigan Retirement System
Michigan
$36.6M 291,303 +251,600 +634%
Fisher Asset Management
60
Fisher Asset Management
Washington
$36.3M 289,137 -9,893 -3%
National Pension Service
61
National Pension Service
South Korea
$34.3M 273,055 +1,572 +0.6%
Hudson Bay Capital Management
62
Hudson Bay Capital Management
Connecticut
$33.6M 267,740 +67,220 +34%
Canada Pension Plan Investment Board
63
Canada Pension Plan Investment Board
Ontario, Canada
$32M 255,183 +24,379 +11%
LSV Asset Management
64
LSV Asset Management
Illinois
$31.6M 251,959 +9,983 +4%
Adage Capital Partners
65
Adage Capital Partners
Massachusetts
$31.1M 247,937 +177,170 +250%
Fidelity International
66
Fidelity International
Bermuda
$30.7M 244,332 +124,332 +104%
Russell Investments Group
67
Russell Investments Group
United Kingdom
$30.4M 242,053 +34,404 +17%
California State Teachers Retirement System (CalSTRS)
68
California State Teachers Retirement System (CalSTRS)
California
$30M 238,691 +8,156 +4%
ProShare Advisors
69
ProShare Advisors
Maryland
$30M 238,558 +13,903 +6%
AllianceBernstein
70
AllianceBernstein
Tennessee
$29M 231,108 +2,054 +0.9%
Pictet Asset Management
71
Pictet Asset Management
Switzerland
$28.9M 229,342 +11,812 +5%
Franklin Resources
72
Franklin Resources
California
$28.8M 229,010 -359,107 -61%
Citigroup
73
Citigroup
New York
$28M 223,240 -79,375 -26%
Connor, Clark & Lunn Investment Management (CC&L)
74
Connor, Clark & Lunn Investment Management (CC&L)
British Columbia, Canada
$27.3M 217,738 -60,096 -22%
Swedbank
75
Swedbank
Sweden
$26.8M 213,719 -4,320 -2%
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