PetroChina was the first public company to reach a $1 trillion market value in intraday trading in 2007.
PetroChina reached the figure on its first trading day in Shanghai, November 5, 2007, after its shares surged following the initial public offering. The company is the listed subsidiary of China National Petroleum Corporation and is one of China’s largest oil and gas businesses.
Its valuation quickly fell back, so the achievement was a brief market event rather than a sustained ranking. This is why lists of trillion-dollar companies may distinguish between an intraday peak, a closing valuation, and a valuation maintained over time.
PetroChina is also frequently confused with Saudi Aramco. Saudi Aramco became associated with a roughly $2 trillion valuation after its 2019 listing, but it was not the company behind the 2007 milestone.