Shares in Herbalife were up as much as 15% as Pershing Square's Bill Ackman delivered what he said yesterday was the most important presentation of his career on the nutritional-supplement company.
Appearing on CNBC Monday afternoon, Ackman reiterated his assertion that the Grand Cayman-based firm's business model doesn't add up and that its shares were going to zero.
Shares fell $6 yesterday.
Herbalife has gained 33% since December 2012 when Ackman published a 334-page document he said showed the company was a fraud.
Here's the chart:
More From Business Insider