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
776
$315K
777
$314K
778
$312K
779
$312K
780
$311K
781
$311K
782
$310K
783
$310K
784
$309K
785
$307K
786
$307K
787
$305K
788
$305K
789
$304K
790
$304K
791
$304K
792
$299K
793
$298K
794
$298K
795
$298K
796
$297K
797
$296K
798
$293K
799
$292K
800
$291K