BILL ACKMAN: I'm About To Deliver The Most Important Presentation Of My Entire Career

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 will be unveiling an investigation into Herbalife's nutrition clubs. He says he has hundreds of hours of video, audio and internal documents to support his claims.

The presentation will be at 10 a.m. EST.

He added that Herbalife's CEO Michael Johnson and his team are invited to the event.

Ackman has been publicly shorting Herbalife since December 2012. He believes the nutrition company operates as a "pyramid scheme" and that regulators will be induced to investigate the company and shut it down.

The stock is currently off 4%.