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Biogen
BIIB

1,036 hedge funds and large institutions have $30.7B invested in Biogen in 2026 Q2 according to their latest regulatory filings, with 125 funds opening new positions, 423 increasing their positions, 292 reducing their positions, and 82 closing their positions.

New
Increased
Maintained
Reduced
Closed

52% more first-time investments, than exits

New positions opened: 125 | Existing positions closed: 82

45% more repeat investments, than reductions

Existing positions increased: 423 | Existing positions reduced: 292

43% more call options, than puts

Call options by funds: $676M | Put options by funds: $473M

24% more capital invested

Capital invested by funds: $24.7B → $30.7B (+$5.92B)

14% more funds holding in top 10

Funds holding in top 10: 7 → 8 (+1)

4.24% more ownership

Funds ownership: 91.95% → 96.19% (+4.2%)

3% more funds holding

Funds holding: 1,009 → 1,036 (+27)

Holders
1,036
Holders Change
+27
Holders Change %
+2.68%
% of All Funds
12.51%
Holding in Top 10
8
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+14.29%
% of All Funds
0.1%
New
125
Increased
423
Reduced
292
Closed
82
Calls
$676M
Puts
$473M
Net Calls
+$202M
Net Calls Change
+$238M

Top Buyers

Rank Fund Capital Flow
1
Fidelity Investments
Fidelity Investments
Massachusetts
+$1.03B
2
Amundi
Amundi
France
+$139M
3
UBS Group
UBS Group
Switzerland
+$96.9M
4
Pacer Advisors
Pacer Advisors
Pennsylvania
+$88.5M
5
Primecap Management
Primecap Management
California
+$75.9M

Top Sellers

Rank Fund Capital Flow
1
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
-$200M
2
VanEck Associates
VanEck Associates
New York
-$188M
3
Point72 Asset Management
Point72 Asset Management
Connecticut
-$138M
4
Boston Partners
Boston Partners
Massachusetts
-$83.5M
5
Balyasny Asset Management
Balyasny Asset Management
Illinois
-$73.6M
Name Holding Trade Value Shares
Change 		Change in
Stake
AF
1001
Advisornet Financial
Minnesota
$1.3K -$1.53K -8 -57%
DF
1002
DecisionPoint Financial
Arizona
$1.26K +$574 +3 +100%
JWM
1003
JPL Wealth Management
Colorado
$1.08K +$383 +2 +67%
AP
1004
Atwood & Palmer
Missouri
$1.08K -$1.34K -7 -58%
EWM
1005
Evermay Wealth Management
Virginia
$1.08K – – –
TBFA
1006
Three Bearings Fiduciary Advisors
New Hampshire
$1.08K – – –
WWM
1007
Wolff Wiese Magana
California
$1.08K – – –
SWAG
1008
Spectrum Wealth Advisory Group
California
$1.08K +$956 +5 New
RWM
1009
RMG Wealth Management
Wisconsin
$1.04K – – –
BIM
1010
Breakwater Investment Management
Washington
$865 – – –
CCM
1011
Chilton Capital Management
Texas
$865 – – –
TFM
1012
TFC Financial Management
Massachusetts
$865 – – –
PJC
1013
Phillip James Consulting
Minnesota
$864 – – –
DCM
1014
Davis Capital Management
Florida
$864 +$383 +2 +100%
DRP
1015
Decker Retirement Planning
Utah
$864 +$765 +4 New
M
1016
MOTCO
Texas
$864 +$765 +4 New
AA
1017
Addison Advisors
Vermont
$649 -$28.9K -151 -98%
CT
1018
Colonial Trust
South Carolina
$648 – – –
FG
1019
Fairman Group
Pennsylvania
$648 – – –
HHGA
1020
Halbert Hargrove Global Advisors
California
$491 +$383 +2 New
3FI
1021
3 Factor Indexing
California
$433 – – –
SA
1022
Seneschal Advisors
Washington
$433 – – –
DWM
1023
Dogwood Wealth Management
Kansas
$432 – – –
HFS
1024
Horizon Financial Services
North Carolina
$432 +$383 +2 New
MBFW
1025
Morton Brown Family Wealth
Pennsylvania
$432 +$383 +2 New
39 40
41
42 43

BIIB Hedge Fund Activity: Q2 2026 in Review

1,036 of the 8,279 institutional investors tracked by Wall St. Rank reported a position in Biogen (BIIB) for Q2 2026, worth a combined $30.7B — up 24% from $24.7B a quarter earlier.

Buyers outnumbered sellers: 125 funds opened new BIIB positions and 82 closed out — a net gain of 43 holders — while 423 added to existing stakes and 292 trimmed.

The largest buyer was Fidelity Investments, adding an estimated $1.03B. The largest seller was T. Rowe Price Investment Management, cutting an estimated $200M.

  • 1,036 institutional investors held Biogen (BIIB) as of Q2 2026, up from 1,009 in Q1 2026.
  • Funds reported $30.7B of Biogen stock for Q2 2026, up 24% quarter-over-quarter.
  • 125 funds opened new Biogen positions in Q2 2026 and 82 closed out, a net change of +43 holders.
  • The largest Biogen buyer in Q2 2026 was Fidelity Investments, an estimated $1.03B added.
  • The largest Biogen seller in Q2 2026 was T. Rowe Price Investment Management, an estimated $200M sold.

Based on aggregated 13F filings for Q2 2026.