Extending Monday's gains, battered crude-oil futures were trading more than 2% higher after West Texas Intermediate oil trading for January delivery on the New York Mercantile Exchange gained 81 cents, or 2.1%, to trade at $37.12 a barrel. Shares of oil and gas companies followed suit. Southwestern Energy , Ensco Plc. , Endo International , Transocean Ltd. were all trading at least 3% higher, while the S&P 500 energy sector led the indexes' s 10 sectors, with a 2.4% advance. A rise in shares of Exxon Mobil Corp. and Chevron Corp. were contributing about 34 points to the Dow Jones Industrial Average's gains in early morning trading.
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