Looked like some insiders don't want to bet on that success at all:
Completely and totally WRONG conclusion, IMO!!
OK, they sold 800,000 shares in the 8s for some profit taking to appease their own investors -- that's only 3.4% of their total holdings in ACHN. They still own 222.49 million shares.
BTW, Pete Kolchinsky (RA) and Dan Gold (QVT) own ~35% of ACHN between them ... they have sold a small % for profit taking during the recent run up, they are holding the vast majority ... for very good reasons!!!
Note that the above total % holdings is about same as Baupost holdings in Idenix.
Yes, ACHN is a prime buyout candidate ... for its nuke (3422)!!!