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NEW YORK ( TheStreet) - SunPower(SPWRA), Southern Union(SUG), Chesapeake Midstream Partners(CHKM) and Bristow Group(BRS - Get Report) clocked smart gains this week, while Frontline(FRO), Yingli Green Energy Holding(YGE), GT Solar International(SOLR) and Trina Solar(TSL - Get Report) fared badly.
Among the advancers, SunPower gained 10.1%.
Southern Union topped the charts, jumping 2.7%. Williams has increased its bid on the company to about $5.6 billion in cash, topping its own previous bid of $5 billion in cash.
Chesapeake Midstream Partners rose 1%, Bristow Group edged up 0.9% and
PAA Natural Gas Storage(PNG) moved 0.9% higher.
Complete Production Services(CPX) advanced 0.8% after equity analyst Brian Uhlmer at
Global Hunter Securities raised the stock's rating to buy from accumulate with a target price of $45 per share.
Williams Partners(WPZ - Get Report) advanced 0.7% on receiving an FERC endorsement to increase its Transco natural gas pipeline network by another 142,000 dekatherms of incremental firm natural gas transportation capacity by November 2012.
EQT Corporation(EQT - Get Report) rose 0.5% after
SunTrust Robinson's equity analyst Neal Dingmann upgraded the stock to buy from neutral with a 12-month target price of $68 per share.
Frontline was the top lagger, shedding 14.2% after
Morgan Stanley lowered its price target to $14.5 from $16.
Credit Suisse has also cut the stock's price target from $18 per share to $12.
Yingli Green Energy lost 14% after Goldman cut its rating on the stock to sell from neutral with a price target of $8 per share.
GT Solar and Trina Solar declined 11.3% and 11.2%, respectively.
CGG Veritas(CGV) erased 10.9% after
Barclays Capital downgraded the stock to equal weight from overweight with a target price of 31 euros per share.
Reversing to the downside were
Denbury Resources(DNR - Get Report) down 8.9%,
EXCO Resources(XCO - Get Report) shedding 8.9%,
Hess Corp(HES - Get Report) trimming 7.9%,
Suntech Power Holdings(STP) erasing 7.8%,
Bill Barett Corporation(BBG - Get Report) losing 7.7% and
Talisman Energy(TLM) retreating by 7.6%.
ReneSola(SOL - Get Report) lost 7.5% after the company lowered its second-quarter revenue guidance to the range of $235 million to $245 million, from $280 million to $300 million, owing to declining wafer prices.
Statoil ASA(STO - Get Report) decreased 7.4% after
Standard & Poor's equity analyst Christine Tiscareno downgraded the stock to sell from buy.
Other losers included
First Solar(FSLR - Get Report),
Oasis Petroleum(OAS - Get Report),
Pioneer Natural Resources(PXD - Get Report) and
YPF SA(YPF - Get Report).