CNOOC Group is the third-largest National Oil Company (NOC) in the People's Republic of China after CNPC (parent of PetroChina), and China Petrochemical Corporation (parent of Sinopec).
* CNOOC Limited (中国海洋石油有限公司) is listed in Hong Kong and New York Sehk - 0883, Nyse - CEO.
* China Oilfield Services (COSL) is a fellow subsidiary of CNOOC Limited listed in Hong Kong.
While CNPC Group/PetroChina Limited originally focused on onshore upstream projects, and China Petrochemical Corporation/Sinopec Limited focused on downstream refining, CNOOC Group focus on the exploitation, exploration and development of crude oil and natural gas offshore of China.
CNOOC Group is a state-owned oil company, fully owned by the Government of the People's Republic of China, and the State-Owned Assets Supervision and Administration Commission of the State Council (SASAC) performs the rights and obligations of shareholder on behalf of the government.