You'd think so, but the stock isn't too far off its 52-week high. Yes it glitched a little on Thursday, but it almost completely recovered by Friday close.

Ackman is probably right about the company. But many other people, e.g. Carl Icahn, are buying HLF. Maybe it's to make money, maybe it's just to fuck with Ackman for the lulz. After all, Icahn is 80 years old. He'll never live long enough to spend his billions. Why not have a little fun messing with someone he dislikes from a previous business dealing?