BIIB icon

Biogen
BIIB

Overview Fund Activity

850 hedge funds and large institutions have $16.2B invested in Biogen in 2025 Q2 according to their latest regulatory filings, with 94 funds opening new positions, 337 increasing their positions, 260 reducing their positions, and 99 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
850
Holders Change
-18
Holders Change %
-2.07%
% of All Funds
11.4%
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
337
Reduced
260
Closed
99
Calls
$381M
Puts
$333M
Net Calls
+$47.6M
Net Calls Change
+$323M

Top Buyers

1
Point72 Asset Management
1
Point72 Asset Management
Connecticut
$481M
2
Alyeska Investment Group
2
Alyeska Investment Group
Illinois
$63.9M
3
Arrowstreet Capital
3
Arrowstreet Capital
Massachusetts
$78.4M
4
Fidelity Investments
4
Fidelity Investments
Massachusetts
$210M
5
A
5
AustralianSuper
Australia
$92.9M

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 Holding Trade Value Shares
Change 		Shares
Change %
Sumitomo Mitsui Trust Group
51
Sumitomo Mitsui Trust Group
Japan
$52.1M -$268K -2,130 -0.5%
BNP Paribas Financial Markets
52
BNP Paribas Financial Markets
France
$49.6M +$3.62M +28,818 +8%
Prudential Financial
53
Prudential Financial
New Jersey
$48.7M -$4.12M -32,820 -8%
NL
54
Nuveen LLC
North Carolina
$42.9M +$24.5M +195,228 +133%
California Public Employees Retirement System
55
California Public Employees Retirement System
California
$42.6M -$5.78M -46,044 -12%
TSW
56
Thompson Siegel & Walmsley
Virginia
$40.6M +$8.23M +65,562 +25%
PCM
57
Patient Capital Management
Maryland
$40.2M -$17M -135,139 -30%
RhumbLine Advisers
58
RhumbLine Advisers
Massachusetts
$37.7M +$484K +3,853 +1%
Mitsubishi UFJ Asset Management
59
Mitsubishi UFJ Asset Management
Japan
$37M +$2.6M +20,721 +8%
SOMRS
60
State of Michigan Retirement System
Michigan
$36.6M +$31.6M +251,600 +634%
Fisher Asset Management
61
Fisher Asset Management
Washington
$36.3M -$1.24M -9,893 -3%
National Pension Service
62
National Pension Service
South Korea
$34.3M +$197K +1,572 +0.6%
Hudson Bay Capital Management
63
Hudson Bay Capital Management
Connecticut
$33.6M +$8.44M +67,220 +34%
Canada Pension Plan Investment Board
64
Canada Pension Plan Investment Board
Ontario, Canada
$32M +$3.06M +24,379 +11%
LSV Asset Management
65
LSV Asset Management
Illinois
$31.6M +$1.25M +9,983 +4%
Adage Capital Partners
66
Adage Capital Partners
Massachusetts
$31.1M +$22.3M +177,170 +250%
Fidelity International
67
Fidelity International
Bermuda
$30.7M +$15.6M +124,332 +104%
Russell Investments Group
68
Russell Investments Group
United Kingdom
$30.4M +$4.32M +34,404 +17%
California State Teachers Retirement System (CalSTRS)
69
California State Teachers Retirement System (CalSTRS)
California
$30M +$1.02M +8,156 +4%
ProShare Advisors
70
ProShare Advisors
Maryland
$30M +$1.75M +13,903 +6%
AllianceBernstein
71
AllianceBernstein
Tennessee
$29M +$258K +2,054 +0.9%
Pictet Asset Management
72
Pictet Asset Management
Switzerland
$28.9M +$1.49M +11,812 +5%
Franklin Resources
73
Franklin Resources
California
$28.8M -$45.1M -359,107 -61%
Citigroup
74
Citigroup
New York
$28M -$9.97M -79,375 -26%
Connor, Clark & Lunn Investment Management (CC&L)
75
Connor, Clark & Lunn Investment Management (CC&L)
British Columbia, Canada
$27.3M -$7.55M -60,096 -22%
1 2
3
4 5