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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 %
Teacher Retirement System of Texas
176
Teacher Retirement System of Texas
Texas
$5.15M +$139K +1,103 +3%
GIA
177
Gateway Investment Advisers
Ohio
$5.08M -$98.5K -784 -2%
Daiwa Securities Group
178
Daiwa Securities Group
Japan
$4.91M -$536K -4,265 -10%
GIC
179
Generali Investments CEE
Czech Republic
$4.87M +$1.47M +11,695 +43%
HF
180
HRT Financial
New York
$4.81M -$17.6M -140,066 -79%
Natixis Advisors
181
Natixis Advisors
Massachusetts
$4.8M +$1.42M +11,292 +42%
PNC Financial Services Group
182
PNC Financial Services Group
Pennsylvania
$4.78M +$1.62M +12,894 +51%
Mercer Global Advisors
183
Mercer Global Advisors
Colorado
$4.73M +$3.6M +28,690 +321%
MIM
184
MetLife Investment Management
New Jersey
$4.69M -$85K -677 -2%
Squarepoint
185
Squarepoint
New York
$4.67M -$47.5M -378,349 -91%
JFG
186
Jefferies Financial Group
New York
$4.66M -$1.62M -12,877 -26%
Calamos Advisors
187
Calamos Advisors
Illinois
$4.64M – – –
NIM
188
NEOS Investment Management
Connecticut
$4.62M +$1.77M +14,113 +62%
State of Tennessee, Department of Treasury
189
State of Tennessee, Department of Treasury
Tennessee
$4.59M -$999K -7,953 -18%
GFM
190
GF Fund Management
China
$4.58M +$128K +1,018 +3%
COPPSERS
191
Commonwealth of Pennsylvania Public School Employees Retirement System
Pennsylvania
$4.51M +$309K +2,463 +7%
Mariner
192
Mariner
Kansas
$4.51M +$1.5M +11,910 +50%
CNB
193
Czech National Bank
Czech Republic
$4.5M +$276K +2,196 +7%
Ensign Peak Advisors
194
Ensign Peak Advisors
Utah
$4.49M -$295K -2,351 -6%
II
195
IFM Investors
Australia
$4.49M +$254K +2,023 +6%
KBC Group
196
KBC Group
Belgium
$4.42M +$109K +864 +3%
TCM
197
Tang Capital Management
California
$4.4M – – –
VPIM
198
Vanguard Personalized Indexing Management
California
$4.39M +$1.66M +13,226 +61%
N
199
Natixis
France
$4.37M +$612K +4,876 +16%
Carson Wealth (CWM LLC)
200
Carson Wealth (CWM LLC)
Nebraska
$4.37M +$834K +6,639 +24%
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