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 defies slump to surge 163pc on debut

Oil giant beats Exxon to become world's biggest firm by value

Shares in PetroChina defied the market slump yesterday to surge 163.23 per cent on their debut, helping the mainland oil producer to overtake Exxon Mobil Corp as the world's biggest company by market value.