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

Top Sellers

1
BlackRock
BlackRock
New York
$1.7B
2
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
$175M
3
Amundi
Amundi
France
$77.2M
4
SG Americas Securities
SG Americas Securities
New York
$2.82M
5
Qube Research & Technologies (QRT)
Qube Research & Technologies (QRT)
United Kingdom
$93.4M
Name Holding Trade Value Shares
Change 		Shares
Change %
Voloridge Investment Management
851
Voloridge Investment Management
Florida
– -$18.4M -134,489 Closed
CCM
852
Cutter Capital Management
New York
– -$15.5M -113,500 Closed
TC
853
TwinBeech Capital
New York
– -$8.79M -64,253 Closed
WorldQuant Millennium Advisors
854
WorldQuant Millennium Advisors
New York
– -$7.8M -57,013 Closed
BS
855
Banco Santander
Spain
– -$7.52M -54,991 Closed
TAF
856
Tredje AP-fonden
Sweden
– -$6.84M -50,000 Closed
FMI
857
Factory Mutual Insurance
Massachusetts
– -$6.73M -49,200 Closed
CF
858
Corebridge Financial
Texas
– -$6.06M -44,254 Closed
AGA
859
Altrinsic Global Advisors
Connecticut
– -$5.16M -37,698 Closed
KMC
860
Kirr Marbach & Co
Indiana
– -$4.58M -33,444 Closed
FC
861
FORA Capital
Florida
– -$3.42M -24,991 Closed
DGM
862
Delta Global Management
New York
– -$2.45M -17,872 Closed
XT
863
XTX Topco
Cayman Islands
– -$2.29M -16,743 Closed
LFAS
864
Level Four Advisory Services
Texas
– -$2.21M -16,154 Closed
LP
865
LMR Partners
United Kingdom
– -$2.16M -15,802 Closed
AIM
866
Aigen Investment Management
New York
– -$1.97M -14,365 Closed
FAM
867
Fred Alger Management
New York
– -$1.66M -12,159 Closed
Walleye Trading
868
Walleye Trading
New York
– -$1.53M -11,191 Closed
SP
869
SIH Partners
Delaware
– -$1.43M -10,414 Closed
ALMGDA
870
AG2R La Mondiale Gestion d'Actifs
France
– -$992K -7,641 Closed
VF
871
Virtu Financial
New York
– -$766K -5,599 Closed
BC
872
Bridgefront Capital
Texas
– -$722K -5,275 Closed
CP
873
Camelot Portfolios
Ohio
– -$677K -4,950 Closed
AIP
874
Arrowpoint Investment Partners
Singapore
– -$652K -4,763 Closed
AM
875
AGF Management
Ontario, Canada
– -$641K -4,686 Closed
33 34
35
36 37