(Bloomberg) -- Cnooc Ltd. jumped 20% in its first day of trading in Shanghai as mainland investors jumped at the chance for exposure to soaring oil and gas prices.

The company’s A-shares opened at 12.96 yuan ($2.02), after pricing at 10.80 yuan.

China’s biggest offshore driller is raising 28 billion yuan ($4.3 billion) with the issuance after it was delisted by the New York Stock Exchange following U.S. sanctions. The A-share debut was the largest in China and the fourth largest globally this year, according to data compiled by Bloomberg.

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