PetroChina, the oil company largely owned by the Chinese government, has overtaken ExxonMobil of the US to regain its position as the world's largest listed energy group by market capitalisation.
It took less a year for the Chinese group to reclaim the top slot it lost during the financial crisis of 2008 when oil prices collapsed and investors fled to the perceived safety of international oil companies such as ExxonMobil and ChevronTexaco of the US and Royal Dutch Shell and BP, both based in Europe.
Other national oil companies also largely made up the distance they had lost to their larger international peers.
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