NEW YORK ( TheStreet) -- Key Energy Services (KEG - Get Report), EV Energy Partners (EVEP - Get Report), Tesoro (TSO - Get Report) and Complete Production Services (CPX) were top performers last week, while J.A. Solar (JASO - Get Report), Forest Oil (FST - Get Report) and Trina Solar (TSL - Get Report) eroded substantial value.
Among the advancers the past week, Key Energy Services and EV Energy Partners topped the charts, gaining 10.9% and 10.8%, respectively.
Tesoro rose 10.7% over the week, as Barclays Capital has raised the stock's rating to overweight from equal weight with a target price of $37 per share. Tesoro's Los Angeles refinery, temporarily shutdown, is ramping up towards normal operations.
Complete Production Services rose 10.1% after J.P. Morgan rated the stock overweight with a target price of $42 per share.InterOil (IOC) and SunPower (SPWRA) gained 9.8% and 9.5%, respectively. Oil States International (OIS - Get Report) moved up 9.3% as CLSA has raised the stock's rating to buy from outperform. The brokerage has raised the target price to $95 per share from $94. Halliburton advanced 9% this week. G.T. Solar (SOLR) rose 8.7% after receiving equipment orders worth $81.7 million from two customers in Asia. The orders were for equipment to produce poly-silicon used in the manufacture of solar cells. Among other movers, Patterson-UTI Energy (PTEN - Get Report) advanced 8.6%, RPC Inc (RES - Get Report) rose 7.7%, Superior Energy Services (SPN - Get Report) grew 7.7% and Seacor Holdings (CKH - Get Report) added 7.4%, Helmerich & Payne (HP - Get Report) moved up 7.4% last week after signing agreements to build and operate 12 FlexRigs, for delivery to eight exploration and production companies during fiscal 2012. Oceaneering International (OII - Get Report) gained 7.1% during the week. National-Oilwell Varco (NOV - Get Report) piled 6.8% on plans to acquire Ameron International, a manufacturer of fiberglass-composite pipes for a consideration of $85 per share in all an all-cash transaction valuing Ameron at $772 million, or 7.1 times its estimated 2012 EBITDA. Other winners included Whiting Petroleum (WLL - Get Report) up 6.6%, while Continental Resources (CLR - Get Report) gained 6.3%. Atlas Energy (ATLS - Get Report) rose 6.2%, whereas Anadarko Petroleum (APC - Get Report) and Schlumberger (SLB - Get Report) gained 6.1% each. Nexen (NXY) improved 6.0%, Concho Resources (CXO - Get Report) piled 5.8% and YPF (YPF - Get Report) advanced 5.8%. J.A. Solar Holdings was the top lagger, shedding 8.2% as a drop in polysilicon prices could affect the company's competitiveness. The company has signed long-term purchase contracts with producers like GCL-Poly Energy Holdings and Wacker Chemie. Forest Oil Corporation shed 7.5%. Trina Solar declined 5.6% as Zacks has maintained a sell on the stock.