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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 %
Bank of New York Mellon
26
Bank of New York Mellon
New York
$114M 904,054 -49,757 -5%
First Trust Advisors
27
First Trust Advisors
Illinois
$110M 873,823 +212,403 +32%
T. Rowe Price Associates
28
T. Rowe Price Associates
Maryland
$105M 833,927 -317,265 -28%
Balyasny Asset Management
29
Balyasny Asset Management
Illinois
$104M 831,905 +45,686 +6%
Barclays
30
Barclays
United Kingdom
$100M 797,655 -120,698 -13%
Man Group
31
Man Group
United Kingdom
$99.6M 793,282 +27,961 +4%
Qube Research & Technologies (QRT)
32
Qube Research & Technologies (QRT)
United Kingdom
$93.4M 743,309 -483,400 -39%
A
33
AustralianSuper
Australia
$92.9M 739,416 +341,719 +86%
Massachusetts Financial Services
34
Massachusetts Financial Services
Massachusetts
$90.1M 717,631 +9,216 +1%
Millennium Management
35
Millennium Management
New York
$84.8M 675,502 +251,505 +59%
Goldman Sachs
36
Goldman Sachs
New York
$84.3M 670,852 +66,155 +11%
Arrowstreet Capital
37
Arrowstreet Capital
Massachusetts
$78.4M 624,371 +409,591 +191%
Amundi
38
Amundi
France
$77.2M 579,797 -736,150 -56%
Citadel Advisors
39
Citadel Advisors
Florida
$76.4M 608,590 +66,826 +12%
Allianz Asset Management
40
Allianz Asset Management
Germany
$66.2M 527,060 -140,707 -21%
Alyeska Investment Group
41
Alyeska Investment Group
Illinois
$63.9M 508,773 +508,773 New
Two Sigma Investments
42
Two Sigma Investments
New York
$63.7M 507,539 -371,791 -42%
Royal Bank of Canada
43
Royal Bank of Canada
Ontario, Canada
$62.3M 496,152 +165,590 +50%
CCM
44
Causeway Capital Management
California
$62M 493,355 +59,838 +14%
Two Sigma Advisers
45
Two Sigma Advisers
New York
$57.2M 455,500 -221,900 -33%
Robeco Institutional Asset Management
46
Robeco Institutional Asset Management
Netherlands
$56.4M 448,757 -4,772 -1%
UBS Group
47
UBS Group
Switzerland
$56M 445,684 -200,463 -31%
Swiss National Bank
48
Swiss National Bank
Switzerland
$55.6M 443,100 +32,100 +8%
HSBC Holdings
49
HSBC Holdings
United Kingdom
$55.6M 443,269 -40,760 -8%
Sumitomo Mitsui Trust Group
50
Sumitomo Mitsui Trust Group
Japan
$52.1M 414,830 -2,130 -0.5%
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