PetroChina expected to surpass Exxon Mobil as most valuable company

HONG KONG: When the state oil and natural gas company PetroChina makes its debut Monday on the Shanghai Stock Exchange, China's booming stock markets will be on the verge of another milestone. Soon after the Shanghai listing, analysts expect PetroChina to surpass the U.S. energy behemoth Exxon Mobil as the world's largest company by market value.

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