1,100 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, 323 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: 83.72%83.55% (-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: 323 | Existing positions reduced: 467

Holders
1,100
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
651
$544K
652
$542K
653
$539K
654
$539K
655
$539K
656
$534K
657
$533K
658
$529K
659
$528K
660
$519K
661
$519K
662
$515K
663
$506K
664
$503K
665
$498K
666
$494K
667
$494K
668
$494K
669
$491K
670
$490K
671
$485K
672
$484K
673
$481K
674
$481K
675
$480K