Shares of oil driller Nabors Industries Ltd. rose 4% Monday to head the list of S&P 500 gainers, as oil prices climbed back above the $55-a-barrel level. The stock has been volatile through December as oil prices have fallen sharply, but has gained about 5%, since the news earlier this month that a Delaware court has cleared the way for the close of its planned merger with C&J Energy Services Inc . Nabors has extended the merger date to March 31 from an original closing date of Dec. 31, which analysts at Suntrust Robinson Humphrey said was a "net positive for getting the deal done." Nabors shares have lost 21.5% in the year, while the S&P 500 has gained about 13%.
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