PetroChina became the first publicly traded company valued above $1 trillion on the day of its 2007 Shanghai listing. The company’s shares more than doubled in their debut, producing a brief valuation that exceeded the milestone.
PetroChina had already been listed in Hong Kong and New York, but the Shanghai offering gave mainland investors direct access to its shares. The dramatic debut reflected strong enthusiasm for Chinese equities and for the country’s energy sector.
The valuation later fell substantially, illustrating why market-cap records can be temporary. A first-day price surge does not necessarily indicate that a company’s operating results changed on that day; it reflects what investors were willing to pay for the newly traded shares.