U.S. companies filled 103 of the 250 top spots in Platts' energy firm ratings, which ranked companies by assets, revenues, profits and return on invested capital.
ExxonMobil retains pole position for the 10th year running, with its industry-leading return on capital holding off rivals. The Dow-listed supermajor entered the shale gas market in 2010 with its acquisition of XTO Energy.
BP was back in the top 10 in second place, as it slowly recovers from the massive hit from payouts for the 2010 Gulf of Mexico oil spill. Platts warned that BP's ratings bounce could prove brief, given the looming court battle to settle remaining liabilities in 2015.
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Another ratings climber was Rosneft, which climbed three positions to sixth place. This follows the Russian giant's $55 billion acquisition of TNK-BP, which puts it ahead of ExxonMobil in terms of production and reserves, but still behind in revenues, profits, assets and return on capital.
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