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.

Controls eased on firms keeping profits abroad

Mainland authorities have taken the first step to loosening capital controls by announcing that domestic companies investing abroad no longer need to give the government a deposit guaranteeing that they repatriate 100 per cent of profits from overseas operations.