Carl Icahn started to build up the position in Biogen in Q4 2007 and continued to invest until Q3 2008. Since then they sold 3.5 Million shares. The investor completely sold their stake between Q4 2008 and Q2 2011.
Avg closing price
Price range
Sold -3.22 Million shares
Q2 2011
Avg closing price
$85.74
Price range
$67.16
-
$100.32
Sold 8.2% shares (-287 Thousand shares)
Q4 2008
Avg closing price
$41.28
Price range
$35.92
-
$46.49
Increased shares by 40.8% (+1.02 Million shares)
Q3 2008
Avg closing price
$50.82
Price range
$41.76
-
$65.71
Increased shares by 20.5% (+423 Thousand shares)
Q1 2008