NEW YORK (TheStreet) - Southern Union (SUG), McMoran Exploration (MMR), SunPower (SPWRA) and Cenovus Energy (CVE) were top performers the past week, while STR Holdings (STRI), Transatlantic Petroleum (TAT) and EXCO Resources (XCO) eroded value.Among the advancers for the week, Southern Union topped the charts, jumping 17.6%, as Williams Cos. offered to buy Southern Union for $4.86 billion in an all-cash transaction, higher than the bid by Energy Transfer Equity LP. McMoran Exploration rose 13.7% as CEO James Moffett is optimistic on gas finds in the shallow waters of Gulf of Mexico. He believes that new prospects could be valued at $50 to $65 per share. He further added that gas discoveries could have no liquids, but may produce gas liquids if found. SunPower gained 11.8%. Cenovus Energy advanced 8.3% after equity analyst John Mawdsley at Alta Corp Capital maintained a market outperform rating on the stock with a target price of $42.3 per share. Rosetta Resources ( ROSE) rose 11.8% over the week. FMC Technologies ( FTI) moved up 10.9% after the company signed an agreement with Shell Development (Australia) to supply sub-sea production and other related equipment and services used in field development. The company is required to supply seven large-bore sub-sea production trees, riser bases, sub-sea control systems, production manifolds and other related equipment. Nexen ( NXY) advanced 10.8%. SM Energy ( SM) added 10.7% after the company announced plans to sell 12.5% stake in Eagle Ford shale to a Mitsui & Co. subsidiary for $680 million, as the proceeds could be used to develop assets in the shale play. Trina Solar ( TSL) advanced 10.5% after analysts at Maxim Group rated a new buy on the stock with a price target of $26 per share. Brigantine Advisors equity analyst Ramesh Misra also rated it a buy with a target price of $35 per share. Brigham Exploration ( BEXP) increased 10.1% after equity analyst John Selser of IBERIA Capital Partners raised the stock to outperform from sector perform with a target price of $42 per share. Other winners included Swift Energy ( SFY) up 9.8%, Carbo Ceramics ( CRR) rose 9.8%, Bristow Group ( BRS) grew 9.7%, Patterson-UTI Energy ( PTEN) added 9.5%, Oasis Petroleum ( OAS) gained 9.4%, InterOil ( IOC) improved 9.3%, National-Oilwell Varco ( NOV) piled 8.9% and Oil States International ( OIS) added 8.5%.
STR Holdings was the top lagger, shedding 10.8% as the stock was downgraded to accumulate from buy at Craig Hallum's with a target price of $21 per share. Transatlantic Petroleum lost 9.1% after news that the GRB-1 well could be abandoned. EXCO Resources declined 7.6% after S&P Rating Services placed the company's RTGS on credit-watch negative. JA Solar ( JASO) erased 2.1% after Brean Murray, equity analyst at Wayne Chang, downgraded the stock to sell from hold with a target price of $4 per share. Others on the downside were Energy Transfer Equity ( ETE), Quicksilver Resources ( KWK) and Enbridge Energy Partners ( EEP) with marginal losses.