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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 %
Bank of New York Mellon
26
Bank of New York Mellon
New York
$114M -$6.25M -49,757 -5%
First Trust Advisors
27
First Trust Advisors
Illinois
$110M +$26.7M +212,403 +32%
T. Rowe Price Associates
28
T. Rowe Price Associates
Maryland
$105M -$39.8M -317,265 -28%
Balyasny Asset Management
29
Balyasny Asset Management
Illinois
$104M +$5.74M +45,686 +6%
Barclays
30
Barclays
United Kingdom
$100M -$15.2M -120,698 -13%
Man Group
31
Man Group
United Kingdom
$99.6M +$3.51M +27,961 +4%
Qube Research & Technologies (QRT)
32
Qube Research & Technologies (QRT)
United Kingdom
$93.4M -$60.7M -483,400 -39%
A
33
AustralianSuper
Australia
$92.9M +$42.9M +341,719 +86%
Massachusetts Financial Services
34
Massachusetts Financial Services
Massachusetts
$90.1M +$1.16M +9,216 +1%
Millennium Management
35
Millennium Management
New York
$84.8M +$31.6M +251,505 +59%
Goldman Sachs
36
Goldman Sachs
New York
$84.3M +$8.31M +66,155 +11%
Arrowstreet Capital
37
Arrowstreet Capital
Massachusetts
$78.4M +$51.4M +409,591 +191%
Amundi
38
Amundi
France
$77.2M -$98M -736,150 -56%
Citadel Advisors
39
Citadel Advisors
Florida
$76.4M +$8.39M +66,826 +12%
Susquehanna International Group
40
Susquehanna International Group
Pennsylvania
$74.6M +$40.9M +325,727 +121%
Allianz Asset Management
41
Allianz Asset Management
Germany
$66.2M -$17.7M -140,707 -21%
Alyeska Investment Group
42
Alyeska Investment Group
Illinois
$63.9M +$63.9M +508,773 New
Two Sigma Investments
43
Two Sigma Investments
New York
$63.7M -$46.7M -371,791 -42%
Royal Bank of Canada
44
Royal Bank of Canada
Ontario, Canada
$62.3M +$20.8M +165,590 +50%
CCM
45
Causeway Capital Management
California
$62M +$7.52M +59,838 +14%
Two Sigma Advisers
46
Two Sigma Advisers
New York
$57.2M -$27.9M -221,900 -33%
Robeco Institutional Asset Management
47
Robeco Institutional Asset Management
Netherlands
$56.4M -$599K -4,772 -1%
UBS Group
48
UBS Group
Switzerland
$56M -$25.2M -200,463 -31%
Swiss National Bank
49
Swiss National Bank
Switzerland
$55.6M +$4.03M +32,100 +8%
HSBC Holdings
50
HSBC Holdings
United Kingdom
$55.6M -$5.11M -40,760 -8%
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