PetroChina was the largest publicly traded company by market capitalization at the end of 2007.
PetroChina briefly became the world’s largest company by market capitalization after its Shanghai share listing in November 2007. Its valuation surged during the offering and amid strong investor interest in energy companies, although the shares later declined substantially from their peak.
PetroChina is the listed arm of China National Petroleum Corporation, one of China’s major state-owned energy groups. Its activities include oil and gas exploration, production, refining, transportation, and sales. The company’s size therefore reflected both the importance of energy and the enthusiasm surrounding China’s rapidly expanding economy at that time.
Historical market-cap rankings can be difficult to compare because stock prices, exchange rates, share classes, and free-float adjustments differ. PetroChina’s brief top ranking is not the same as saying it was the world’s largest company by revenue or reserves. It illustrates how a market valuation can change quickly after a major listing.