NEW YORK ( TheStreet) -- Trina Solar (TSL - Get Report), Renesola (SOL), Tesoro Corp (TSO - Get Report), Yingli Green Energy Holding (YGE - Get Report), Oceaneering International (OII - Get Report) and China Petroleum & Chemical Corp (SNP - Get Report) gained last week, whereas Frontline Ltd/Bermuda (FRO), Quicksilver Resources (KWK), Comstock Resources (CRK - Get Report), First Oil (FST) and Teekay Offshore Partners (TOO) eroded substantial value.Trina Solar led the pack of winners, up 20.1%. Ahmar Zaman, analyst at Piper Jaffray, has raised the stock to overweight from neutral with a 12-month target price of $19 per share.
Energy Stocks: Winners and Losers
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