CNOOC Limited, an investment holding company, explores for, develops, produces, and sells crude oil, natural gas, and other petroleum products. The company operates through Exploration and Production, and Trading Business. It produces offshore crude oil and natural gas primarily in Bohai, Western South China Sea, Eastern South China Sea, and East China Sea in offshore China; and Asia, Africa, North America, South America, Oceania, and Europe. As of December 31, 2015, CNOOC Limited had net proved reserves of approximately 4.32 billion barrels-of-oil equivalent. It is also involved in the issuance of bonds. The company was incorporated in 1999 and is based in Hong Kong, Hong Kong. CNOOC Limited 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.