818 hedge funds and large institutions have $71B invested in Biogen in 2014 Q3 according to their latest regulatory filings, with 91 funds opening new positions, 312 increasing their positions, 278 reducing their positions, and 47 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
818
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
41
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
$754M
Puts
$1.23B
Net Calls
Net Calls Change
Name Holding Trade Value Shares
Change
Change in
Stake
1
$6.29B
2
$5.7B
3
$4.23B
4
$4.08B
5
$3.26B
6
$2.61B
7
$2.29B
8
$2.06B
9
$1.92B
10
$1.81B
11
$1.64B
12
$1.3B
13
$1.18B
14
$1.1B
15
$1.07B
16
$935M
17
$891M
18
$854M
19
$795M
20
$753M
21
$718M
22
$673M
23
$670M
24
$633M
25
$589M