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Biogen
BIIB

866 hedge funds and large institutions have $16.4B invested in Biogen in 2025 Q2 according to their latest regulatory filings, with 95 funds opening new positions, 342 increasing their positions, 265 reducing their positions, and 100 closing their positions.

New
Increased
Maintained
Reduced
Closed

150% more funds holding in top 10

Funds holding in top 10: 2 → 5 (+3)

29% more repeat investments, than reductions

Existing positions increased: 342 | Existing positions reduced: 265

14% more call options, than puts

Call options by funds: $381M | Put options by funds: $333M

0.04% less ownership

Funds ownership: 88.84% → 88.8% (-0.04%)

5% less first-time investments, than exits

New positions opened: 95 | Existing positions closed: 100

2% less funds holding

Funds holding: 881 → 866 (-15)

8% less capital invested

Capital invested by funds: $17.8B → $16.4B (-$1.42B)

Holders
866
Holders Change
-15
Holders Change %
-1.7%
% 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
95
Increased
342
Reduced
265
Closed
100
Calls
$381M
Puts
$333M
Net Calls
+$47.6M
Net Calls Change
+$323M

Top Buyers

Rank Fund Capital Flow
1
Point72 Asset Management
Point72 Asset Management
Connecticut
+$427M
2
Alyeska Investment Group
Alyeska Investment Group
Illinois
+$63.4M
3
Arrowstreet Capital
Arrowstreet Capital
Massachusetts
+$51M
4
Fidelity Investments
Fidelity Investments
Massachusetts
+$45.5M
5
A
AustralianSuper
Australia
+$42.6M

Top Sellers

Rank Fund Capital Flow
1
BlackRock
BlackRock
New York
-$206M
2
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
-$158M
3
Amundi
Amundi
France
-$91.7M
4
SG Americas Securities
SG Americas Securities
New York
-$86.9M
5
Qube Research & Technologies (QRT)
Qube Research & Technologies (QRT)
United Kingdom
-$60.2M
Name Holding Trade Value Shares
Change 		Change in
Stake
OP
801
ORG Partners
Indiana
$2.99K +$2.87K +23 New
CIAS
802
CBIZ Investment Advisory Services
Ohio
$2.89K +$1.99K +16 +229%
AWM
803
Abound Wealth Management
Tennessee
$2.76K +$498 +4 +22%
CLOS
804
Compagnie Lombard Odier SCmA
Switzerland
$2.51K – – –
FUBT
805
First United Bank & Trust
Maryland
$2.51K – – –
ITIM
806
Indiana Trust & Investment Management
Indiana
$2.51K – – –
CCM
807
Chilton Capital Management
Texas
$2.51K +$2.49K +20 New
CTA
808
Colonial Trust Advisors
South Carolina
$2.51K +$2.49K +20 New
FFO
809
Fortitude Family Office
Arizona
$2.51K +$2.49K +20 New
KG
810
Kilter Group
New York
$2.51K +$2.49K +20 New
AG
811
AmeriFlex Group
Nevada
$2.29K – – –
PMFA
812
Plante Moran Financial Advisors
Michigan
$2.13K – – –
DWM
813
Darwin Wealth Management
Florida
$2.01K – – –
WAS
814
Winch Advisory Services
Wisconsin
$2.01K – – –
FMP
815
Financial Management Professionals
Texas
$2.01K +$1.99K +16 New
GC
816
GFG Capital
Florida
$2.01K +$1.99K +16 New
AWM
817
Accredited Wealth Management
Kentucky
$1.88K – – –
FGA
818
Fortis Group Advisors
New Jersey
$1.88K – – –
SHIM
819
Stone House Investment Management
Pennsylvania
$1.76K -$1.87K -15 -52%
NL
820
NVWM LLC
Pennsylvania
$1.76K +$125 +1 +8%
HCM
821
Hollencrest Capital Management
California
$1.63K – – –
NECFA
822
New England Capital Financial Advisors
Connecticut
$1.63K – – –
PPC
823
Park Place Capital
Alabama
$1.43K – – –
BWM
824
Bernard Wealth Management
Michigan
$1.38K – – –
1NWS
825
1 North Wealth Services
Maryland
$1.26K – – –
31 32
33
34 35

BIIB Hedge Fund Activity: Q2 2025 in Review

866 of the 7,595 institutional investors tracked by Wall St. Rank reported a position in Biogen (BIIB) for Q2 2025, worth a combined $16.4B — down 8% from $17.8B a quarter earlier.

Sellers outnumbered buyers: 100 funds closed out of BIIB and 95 opened new positions — a net loss of 5 holders — while 265 trimmed existing stakes and 342 added.

The largest buyer was Point72 Asset Management, adding an estimated $427M. The largest seller was BlackRock, cutting an estimated $206M.

  • 866 institutional investors held Biogen (BIIB) as of Q2 2025, down from 881 in Q1 2025.
  • Funds reported $16.4B of Biogen stock for Q2 2025, down 8% quarter-over-quarter.
  • 95 funds opened new Biogen positions in Q2 2025 and 100 closed out, a net change of -5 holders.
  • The largest Biogen buyer in Q2 2025 was Point72 Asset Management, an estimated $427M added.
  • The largest Biogen seller in Q2 2025 was BlackRock, an estimated $206M sold.

Based on aggregated 13F filings for Q2 2025.