Stocks Open Lower as Wall Street Tries to Build on Friday's Rally

U.S. stocks opened lower Monday as investors look to continue the monster rally after Friday's jobs report. Chipotle Mexican Grill (CMG) shares are under pressure after the fast casual chain warned investors that if sales woes stemming from an E. coli outbreak continue, it will report a steep drop in same-store sales for the current quarter. The outbreak, which originally led to the closure of 42 restaurants in Oregon and Washington, has since expanded to 9 states and 47 of the 52 people affected say they ate at the popular burrito chain before falling ill. Vail Resorts (MTN) also reported a narrower loss than what was expected. It said early ski season bookings are higher. Pep Boys (PBY) also is gaining after activist investor Carl Icahn said he had taken a 12% stake in the company as he tries to get it to improve its performance.