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
moved 0.9% higher.
Complete Production Services
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.
(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 - Get Report)
rose 0.5% after
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
lowered its price target to $14.5 from $16.
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.
erased 10.9% after
downgraded the stock to equal weight from overweight with a target price of 31 euros per share.
Reversing to the downside were
(DNR - Get Report)
(XCO - Get Report)
(HES - Get Report)
Suntech Power Holdings
Bill Barett Corporation
(BBG - Get Report)
losing 7.7% and
retreating by 7.6%.
(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.
(STO - Get Report)
decreased 7.4% after
Standard & Poor's
equity analyst Christine Tiscareno downgraded the stock to sell from buy.
Other losers included
(SD - Get Report)
(FSLR - Get Report)
(OAS - Get Report)
Pioneer Natural Resources
(PXD - Get Report)
(YPF - Get Report)