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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 %
BS
851
Banco Santander
Spain
– – -54,991 Closed
TAF
852
Tredje AP-fonden
Sweden
– – -50,000 Closed
FMI
853
Factory Mutual Insurance
Massachusetts
– – -49,200 Closed
CF
854
Corebridge Financial
Texas
– – -44,254 Closed
AGA
855
Altrinsic Global Advisors
Connecticut
– – -37,698 Closed
KMC
856
Kirr Marbach & Co
Indiana
– – -33,444 Closed
FC
857
FORA Capital
Florida
– – -24,991 Closed
DGM
858
Delta Global Management
New York
– – -17,872 Closed
XT
859
XTX Topco
Cayman Islands
– – -16,743 Closed
LFAS
860
Level Four Advisory Services
Texas
– – -16,154 Closed
LP
861
LMR Partners
United Kingdom
– – -15,802 Closed
AIM
862
Aigen Investment Management
New York
– – -14,365 Closed
FAM
863
Fred Alger Management
New York
– – -12,159 Closed
Walleye Trading
864
Walleye Trading
New York
– – -11,191 Closed
SP
865
SIH Partners
Delaware
– – -10,414 Closed
ALMGDA
866
AG2R La Mondiale Gestion d'Actifs
France
– – -7,641 Closed
VF
867
Virtu Financial
New York
– – -5,599 Closed
BC
868
Bridgefront Capital
Texas
– – -5,275 Closed
CP
869
Camelot Portfolios
Ohio
– – -4,950 Closed
AIP
870
Arrowpoint Investment Partners
Singapore
– – -4,763 Closed
AM
871
AGF Management
Ontario, Canada
– – -4,686 Closed
AC
872
Allstate Corporation
Illinois
– – -4,589 Closed
HIM
873
Hillsdale Investment Management
Ontario, Canada
– – -4,210 Closed
MC
874
Machina Capital
France
– – -4,146 Closed
WIA
875
Wealthedge Investment Advisors
New York
– – -3,873 Closed
33 34
35
36 37