870 hedge funds and large institutions have $20.2B invested in Biogen in 2024 Q4 according to their latest regulatory filings, with 130 funds opening new positions, 298 increasing their positions, 321 reducing their positions, and 158 closing their positions.

New
Increased
Maintained
Reduced
Closed

more ownership

Funds ownership:

less repeat investments, than reductions

Existing positions increased: | Existing positions reduced:

less funds holding

Funds holding:

less call options, than puts

Call options by funds: $ | Put options by funds: $

18% less first-time investments, than exits

New positions opened: 130 | Existing positions closed: 158

19% less capital invested

Capital invested by funds: $25.1B → $20.2B (-$4.83B)

38% less funds holding in top 10

Funds holding in top 10: 85 (-3)

Holders
870
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
5
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
$310M
Puts
$356M
Net Calls
Net Calls Change
Name Holding Trade Value Shares
Change
Change in
Stake
151
$9.1M
152
$9.04M
153
$8.98M
154
$8.89M
155
$8.86M
156
$8.81M
157
$8.34M
158
$8.33M
159
$7.98M
160
$7.98M
161
$7.92M
162
$7.88M
163
$7.7M
164
$7.65M
165
$7.52M
166
$7.51M
167
$7.38M
168
$7.31M
169
$7.25M
170
$7.23M
171
$7.19M
172
$7.16M
173
$7.09M
174
$7.01M
175
$6.96M