Chipotle IPO

Investors piled into the initial public offering of Chipotle Mexican Grill today. After the 7.9-million-share offering priced at $22 a share, Chipotle shares doubled to close at $44, after reaching as high as $48.28. Chipotle sold 6.1 million shares in the deal, raising about $134 million, while its parent, McDonald's, sold 1.8 million shares. After the offering, McDonald's will have an 88% voting interest in Chipotle and a 69% economic interest.

Chipotle debut marked the biggest opening-day gain for a U.S. IPO since late 2000 and the biggest opening-day percentage gain on the New York Stock Exchange since Martha Stewart Living Omnimedia went public in 1999. Investors are excited about the chain's growth potential as its CEO, Steven Ells, said he plans to use the bulk of the proceeds from the IPO to open 80 to 90 stores this year. Part will be used to pay down a $30 million line of credit with Chipotle's parent.

At $44, shares of Chipotle are trading at roughly 80 times earnings.