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.

Rules will not hurt state oil companies

The central government yesterday announced rules regulating the wholesale of oil products before the sector's opening to private firms on Monday, although analysts said the move will not keep state-owned firms from dominating the market as imports are still restricted.