As its name suggests, PetroChina Company Ltd is the listed arm of state-owned China National Petroleum Corporation (CNPC). It is China's biggest oil producer, and is listed in Hong Kong, New York, and Shanghai.

PetroChina surges past GE as world No 2 by market value

PetroChina, the mainland's top oil producer, has overtaken General Electric to become the world's second-biggest company by market value after its shares jumped 13 per cent yesterday to a record amid high oil prices and a surging Hong Kong stock market.