1,099 hedge funds and large institutions have $43.4B invested in Biogen in 2021 Q2 according to their latest regulatory filings, with 134 funds opening new positions, 322 increasing their positions, 467 reducing their positions, and 110 closing their positions.

New
Increased
Maintained
Reduced
Closed

more funds holding in top 10

Funds holding in top 10:

more capital invested

Capital invested by funds: $ → $

more first-time investments, than exits

New positions opened: | Existing positions closed:

more funds holding

Funds holding:

0.18% less ownership

Funds ownership: 83.71%83.53% (-0.18%)

6% less call options, than puts

Call options by funds: $1.8B | Put options by funds: $1.91B

31% less repeat investments, than reductions

Existing positions increased: 322 | Existing positions reduced: 467

Holders
1,099
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
27
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
$1.8B
Puts
$1.91B
Net Calls
Net Calls Change

Top Buyers

1 +$508M
2 +$169M
3 +$130M
4
Citadel Advisors
Citadel Advisors
Florida
+$115M
5
HM
HealthCor Management
New York
+$89.6M
Name Holding Trade Value Shares
Change
Change in
Stake
326
$4.5M
327
$4.5M
328
$4.47M
329
$4.46M
330
$4.45M
331
$4.45M
332
$4.42M
333
$4.38M
334
$4.35M
335
$4.34M
336
$4.3M
337
$4.28M
338
$4.24M
339
$4.19M
340
$4.17M
341
$4.16M
342
$4.16M
343
$4.07M
344
$3.98M
345
$3.98M
346
$3.97M
347
$3.95M
348
$3.94M
349
$3.94M
350
$3.9M