CNOOC Limited, an investment holding company, engages in the exploration, development, production, and sale of crude oil, natural gas, and other petroleum products. Its oil and natural gas properties are located primarily in offshore China, which include Bohai Bay, western South China Sea, eastern South China Sea, and East China Sea, as well as in Indonesia, Iraq, other regions in Asia, Australia, Nigeria, Uganda, other regions of Africa, Argentina, the United States, Canada, Trinidad and Tobago, and the United Kingdom. As of December 31, 2012, the company owned net proved reserves of approximately 3.49 billion barrels-of-oil equivalent. It also provides bond issuance services. The company is based in Hong Kong, Hong Kong, and is considered a Red Chip company due to its listing on the Hong Kong Stock Exchange. CNOOC Limited is a subsidiary of China National Offshore Oil Corporation.

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