U.S. stocks open lower as oil slump hits energy shares

U.S. stocks opened lower on Monday, weighed down by losses in energy shares following a sharp drop in oil prices. Oil futures fell more than 3% to below $39 a barrel, once again hitting shares of energy companies. The main indexes retreated after sharp gains on Friday. Among big early morning movers, Keurig Green Mountain, Inc soared 74% after it agreed to get bought by an investor group led by JAB Holding Co. The S&P 500 opened 7 points, or 0.4%, lower at 2,083. The Dow Jones Industrial Average slipped 69 points, or 0.4%, to 17,771. The Nasdaq Composite began the session 11 points, or 0.2%, lower at 5,130.

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