Activist investor Bill Ackman said tomorrow he will give "the most important presentation" of his career.
"You're going to learn why herbalife is going to collapse," he said.
Ackman has been short Herbalife — a maker of health shakes — since late 2012.
Since that time, Ackman has waged a constant campaign against the company, arguing that it's actually an illegal pyramid scheme.
Now he's claiming that he's ready to deliver a final death blow against the company.