PetroChina was the first company in the world to briefly reach a $1 trillion market capitalization during its 2007 Shanghai debut.
PetroChina shares surged on November 5, 2007, when the company began trading in Shanghai. At the session’s high, its implied market value exceeded $1 trillion, making it the first company reported to reach that level.
The achievement was short-lived because the share price fell sharply after the opening surge. Market capitalization depends directly on the quoted share price, so a dramatic first-day move can create a very large temporary valuation without a corresponding overnight change in operations.
PetroChina is the listed arm of China National Petroleum Corporation. Its business spans oil and gas exploration, production, refining, and distribution. The episode is often discussed alongside later, more sustained trillion-dollar milestones by U.S. technology companies.