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Biogen
BIIB
BIIB
1,002 hedge funds and large institutions have $24.7B invested in Biogen in 2026 Q1 according to their latest regulatory filings, with 134 funds opening new positions, 398 increasing their positions, 290 reducing their positions, and 106 closing their positions.
New
Increased
Maintained
Reduced
Closed
37% more repeat investments, than reductions
Existing positions increased: 398 | Existing positions reduced: 290
26% more first-time investments, than exits
New positions opened: 134 | Existing positions closed: 106
1% more capital invested
Capital invested by funds: $24.6B → $24.7B (+$135M)
1% more funds holding
Funds holding: 997 → 1,002 (+5)
10% less call options, than puts
Call options by funds: $324M | Put options by funds: $360M
3.33% less ownership
Funds ownership: 95.27% → 91.94% (-3.3%)
13% less funds holding in top 10
Funds holding in top 10: 8 → 7 (-1)
Holders
1,002
Holders Change
+5
Holders Change %
+0.5%
% of All Funds
12.34%
Holding in Top 10
7
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-12.5%
% of All Funds
0.09%
New
134
Increased
398
Reduced
290
Closed
106
Calls
$324M
Puts
$360M
Net Calls
-$35.5M
Net Calls Change
-$297M
