U.S. stock futures turned mixed on Monday as the consumer discretionary sector was pulled in two opposite directions by Keurig Green Mountain (GMCR) and Chipotle (CMG) - Get Report .  

S&P 500 futures fell 0.1%, Dow Jones Industrial Average futures declined 0.17%, and Nasdaq futures gained 0.04%.

Keurig Green Mountain shares surged more than 75% in premarket trading after the company agreed to be bought by JAB Holding in a deal worth $13.9 billion. Keurig shareholders will receive $92 in cash for each share they hold. The stock closed Friday at $51.70.

Chipotle slumped 9% on news an E.Coli outbreak had spread to three more states -- Illinois, Maryland and Pennsylvania. The outbreak has spread to nine states and affected 52 people.

With a December rate hike from the Federal Reserve already expected, investors were free to celebrate the latest sign of a tightening labor market, leading to a massive rally on U.S. markets. European markets followed suit Monday. Germany's DAX climbed 2.2%, the CAC 40 in France jumped 1.9%, and the FTSE 100 in London gained 0.46%. 

Crude oil prices continued their slump after a meeting of the Organization of Petroleum Exporting Countries failed to produce output cuts. West Texas Intermediate crude fell 1.9% to $39.20 a barrel on Monday morning. 

General Electric (GE) - Get Report fell slightly in premarket trading after the company scrapped plans to sell its appliance business to Electrolux (ELUXY) . The two companies were being sued by the Justice Department to stop the deal which would combine the second- and third-largest appliance manufacturers in the U.S. 

Bluebird Bio (BLUE) - Get Report fell more than 30% after reporting mixed results from its gene therapy study into severe sickle cell patients. Two sickle cell patients infused with Bluebird's gene therapy have only shown small improvement after many months. 

Pep Boys (PBY) - Get Report jumped 7% on Monday after activist investor Carl Icahn disclosed a 12.12% stake in the company late Friday afternoon. Icahn also called for Pep Boys to be sold to Auto Plus, an auto chain owned by Icahn Enterprises.