Investors apparently think the odds are stacked against Bill Ackman in Herbalife Ltd HLF because they pushed shares higher after he indicated he may be the only major investor shorting it.
U.S. stocks stage a rally Monday, buoyed by comments from the Federal Reserve chief Friday.
Stocks rally as investors continue to analyze Federal Reserve Chair Janet Yellen's Friday speech.
Shares of Herbalife rose Monday on news Carl Icahn increased his stake. But Jim Cramer is more cautious.
Figuring out the company's value is a mystery, so it's best to bypass the name.