NEW YORK ( TheStreet) -- GT Solar International ( SOLR), JX Holdings (Pink: JXHLY) and ReneSola ( SOL) emerged top gainers, while Complete Production Services ( CPX), Canadian Natural Resource ( CNQ) and RPC ( RES) headed the losers' list.GT Solar hit 15-month highs on Friday, jumping 15%. During the week, the company received the first order worth $37.5 million for its new DSS650 multi-crystalline ingot growth system from Korea's Nexolon. Meanwhile, JX Holdings surged 12.9% after its subsidiary JX Nippon Oil and Gas Exploration discovered natural gas and condensate reserves in Vietnam. ReneSola gained around 11.1% on the strong performance of solar stocks. Among other solar stocks, Trina Solar ( TSL), Yingli Green Energy Holdings ( YGE), LDK Solar ( LDK) and JA Solar Holdings ( JASO) scaled up around 6.1%, 5.9%, 3.1% and 2.9%, respectively. Cobalt International Energy ( CIE) advanced 8.5% after The Age, an Austrian daily, reported the company is on BHP Billiton's ( BHP) potential acquisition list. Noble Energy ( NBL) and Andarko Petroleum ( APC) also feature in this acquisition list. Frontline ( FRO) zoomed around 8.4% last week. The company has decided to sell its VLCC Front Shanghai for proceeds of $91 million last week. Bankers Petroleum (Pink: BNKJF) piled 8.0% after RBC capital markets and Scotia Capital raised the stock's rating to outperform from sector perform with target prices of C$10.0 and C$9.50, respectively. Transocean ( RIG) gained 8.0% despite a White House Panel ruling that the company, along with BP ( BP) and Halliburton ( HAL), had taken a series of risky, cost-cutting decisions that contributed toward the oil spill that ravaged the Gulf of Mexico last year. Energen ( EGN) scaled up 7.9% after Wells Fargo Securities upgraded the stock to outperform from market perform. InterOil ( IOC) and Petrohawk Energy ( HK), 10 energy stocks for 2011 gained around 6.1% and 5.3%, respectively. Other winners include SandRidge Energy ( SD), Diamond Offshore Drilling ( DO) and Marathon Oil ( MRO), up 6.7%, 5.5% and 4.3%, respectively. Complete Production Services led the pack of losers, declining 10.8% to two-month lows and below its 50-day moving average. Canadian Natural Resource shed around 7.7%, pressured by an explosion at its oil-sands processing operations in Alberta, Canada. The explosion has cut back its oil production by around 15%, according to an analyst at Canaccord Genuity, Bloomberg reports. RPC ( RES) and Patterson-UTI Energy ( PTEN) trimmed nearly 7.5%, and 7.2%, respectively. Bill Barrett ( BBG) declined 6.5% after Wells Fargo Securities downgraded the stock to market perform from outperform.
Ecopetrol ( EC) lost nearly 6.1% last week. The company, along with Petrobras ( PBR), has signed an agreement with Repsol YPF ( REP), consenting to the latter's participation in the exploration of the Tayrona block, located off Colombia's Caribbean coast. Meanwhile, Petrobras declined around 4.3% last week. Halliburton fell 5.8% last week, doomed by the BP oil spill probe. Murphy Oil ( MUR) declined 4.7% after the company announced that it had abandoned three exploration wells in the Republic of Congo. Lufkin Industries ( LUFK) trimmed 3.7% after the stock was cut to market perform at Raymond James. Among other losers, Chesapeake Midstream Partners ( CHKM), Rowan Companies ( RDC) and Key Energy Services ( KEG) dropped around 5.0%, 4.9% and 4.8%, respectively.