NEW YORK (TheStreet) -- Suntech Power Holdings (STP), Frontier Oil (FTO) and SunPower (SPWRB) were the top gainers, while Seacor Holdings (CKH), Tullow Oil and Newfield Exploration (NFX) headed the losers' list last week.Suntech Power Holdings gained 20.2%, topping energy gainers, after the company secured an order from the UN for supplying $80 million worth of solar power systems over the next three years. Canaccord Genuity raised the stock to hold during the week. Frontier Oil swung 14.2% higher after Simmons & Company upgraded its rating on the stock to overweight from neutral. Separately, Deutsche bank raised its price target on Frontier oil to $30 from $23. Meanwhile, Dahlman Rose rated new buy with a price target of $33. On Friday, the stock closed at $28.12. SunPower surged 13.8% to reach 11-month highs after the company raised its 2011 earnings guidance to $2.0-$2.2 per share from the earlier $1.75-$2.05 issued in November. Nexen ( NXY) rose 13.2% last week. Cormark Securities upgraded Nexen to buy from market perform. Williams ( WMB), a pipeline operator, advanced 12.5% after the company announced plans to spin off its oil and natural gas exploration business. The initial public offering (IPO) is scheduled for the third quarter. Tesoro ( TSO) gained 10.2% during the week. Dahlman Rose rated the stock new buy with a target price of $34.0, up 40.7% from the current $24.1. Yingli Green Energy Holdings ( YGE) advanced 9.9% after reporting 2010 fourth quarter adjusted earnings per share at 57 cents vs. estimates of 47 cents, while revenue came in at $616.1 million vs. forecast $557.3 million. Yingli guided 2011 PV module shipments to 1,700MW-1,750MW from $1,062MW reported for 2010. Other solar stocks LDK Solar ( LDK), ReneSola ( SOL), Trina Solar ( TSL), GT Solar International ( SOLR), and First Solar International ( FSLR) advanced around 11.8%, 11.0%, 7.4%, 1.8%, and 1.3%, respectively. Nabors Industries ( NBR) rose 9.5% after reporting 2010 fourth quarter results. Adjusted earnings per share came in at 44 cents vs. consensus 38 cents, while operating revenue came in at $1.32 billion vs. estimated $1.27 billion. Jefferies raised its price target on the stock to $35 from $27, following the earnings announcement, reiterating its buy rating. Cimarex Energy ( XEC) rose 8.3% last week. Lazard capital raised its price target to $136 from $122, maintaining a buy rating, after the company announced fourth quarter results and a discovery in the Permian Basin. Meanwhile, Tudor Pickering upgraded the stock to buy from accumulate. However UBS cut its rating to neutral from buy.
Noble ( NE) gained 8.1%, after Morgan Keegan rated the stock new outperform with a price target of $45, implying 7% upside from current levels. Other movers were Helix Energy Solutions ( HLX), Superior Energy Services ( SPN), Tidewater ( TDW) and Suncor Energy ( SU), up 11.8%, 10.7%, 10.1% and 10.0%, respectively. Among oil giants, Halliburton ( HAL) jumped 7.8% after Morgan Keegan rated the stock new outperform with a price target of $65, implying a 35% upside from current levels. Meanwhile, Occidental Petroleum ( OXY), Murphy Oil ( MUR), and ConocoPhillips ( COP) gained 7.6%, 7.1%, and 7.0%, respectively. Seacor Holdings was the top loser, erasing 11.7% value, after reporting 2010 fourth quarter earnings per share at $1.27 vs. consensus $1.90. Tullow Oil fell 3.8% during the week after a report said French oil giant Total ( TOT) is renegotiating its deal to buy a stake in the London-listed explorer's Ugandan oilfields. Newfield Exploration ( NFX) dipped 3.3% during the week. Sterne, Agee & Leach cut its rating to neutral from buy. Meanwhile, Canaccord Genuity upgraded Newfield Exploration to buy from hold. Ultra Petroleum ( UPL) dipped 2.2% after its 2010 fourth quarter earnings per share came in at 50 cents, below consensus 53 cents. Among others, Ecopetrol ( EC), Petrobra Argentina ( PZE), Cie Generale de Geophysique - Veritas ( CGV) and Sasol ( SSL) dipped 3.1%, 3.0%, 2.5% and 2.3%, respectively.