| Company Name | Entity type | Parent/Subsidiary/Independent | Headquarters | No. of Employees | Annual Revenue ($M) | |
|---|---|---|---|---|---|---|
| CNOOC Ltd | Public | Subsidiary (of China National Offshore Oil Corp) | China | 19,511 | 58,904 | |
| CNOOC Energy Technology & Services Ltd | Public | Subsidiary (of China National Offshore Oil Corp ) | China | XYZ | XYZ | |
| China National Offshore Oil Corp | Government | Parent | China | XYZ | 63 | |
| CNOOC Energy Technology & Services offshoot CNOOC Oilfield Construction & Engineering Co | Private | Independent | China | XYZ | XYZ | |
| CNOOC International Ltd | Private | Subsidiary (of CNOOC Ltd ) | China | XYZ | XYZ | |
| CNOOC Environmental Services (Tianjin) Co Ltd | Private | Subsidiary (of CNOOC Ltd ) | China | XYZ | XYZ | |
| PT Bakrie & Brothers Tbk | Public | Parent | Indonesia | 2,612 | 244 | |
| Cnooc Research Center | Private | Independent | China | XYZ | XYZ | |
| CNOOC Insurance Limited | Private | Independent | Hong Kong | XYZ | XYZ | |
| CNOOC Africa Ltd | Private | Subsidiary (of CNOOC Ltd ) | United Kingdom | XYZ | XYZ | |
| CNOOC Gas & Power Group | Private | Subsidiary (of China National Offshore Oil Corp ) | China | XYZ | XYZ | |
| CNOOC Petroleum Europe Ltd | Private | Subsidiary (of CNOOC Ltd ) | United Kingdom | XYZ | XYZ | |
| CNOOC Engineering Co Ltd | Private | Independent | China | XYZ | XYZ | |
| CNOOC Petroleum Colombia Ltd | Private | Subsidiary (of CNOOC Ltd ) | Colombia | XYZ | XYZ | |
| CNOOC Wiriagar Overseas Ltd | Private | Independent | Indonesia | XYZ | XYZ | |
| CNOOC Petroleum Brasil Ltda | Private | Subsidiary (of CNOOC Ltd ) | Brazil | XYZ | XYZ | |
| CNOOC Rongfeng Energy Co Ltd | Private | Subsidiary (of China National Offshore Oil Corp ) | China | XYZ | XYZ | |
| CNOOC Amano Chemical Co Ltd | Private | Subsidiary (of CNOOC Ltd ) | China | XYZ | XYZ | |
| CNOOC Petroleum North America ULC | Private | Subsidiary (of CNOOC Ltd ) | Canada | XYZ | XYZ | |
| Cnooc Petrochemical Engineering Co Ltd | Private | Subsidiary (of CNOOC Refining & Chemical Co Ltd ) | China | XYZ | XYZ | |
| Cnooc Trading (Singapore) Pte. Ltd. | Private | Independent | Singapore | XYZ | XYZ | |
| CNOOC Orient Petrochemical Co Ltd | Private | Independent | China | XYZ | XYZ | |
| CNOOC Huizhou Petrochemical Co Ltd | Private | Independent | China | XYZ | XYZ | |
| CNOOC Oil & Petrochemicals Co Ltd | Private | Subsidiary (of China National Offshore Oil Corp ) | China | XYZ | XYZ | |
| CNOOC Ningbo Daxie Petrochemical Ltd | Private | Independent | China | XYZ | XYZ | |
| CNOOC Fujian Gas Power Co Ltd | Private | Independent | China | XYZ | XYZ | |
| CNOOC Shenzhen Electric Power Co Ltd | Private | Independent | China | XYZ | XYZ | |
| CNOOC Beihai Gas Development Co Ltd | Private | Independent | China | XYZ | XYZ | |
| CNOOC Zhuhai Natural Gas Power Generation Co Ltd | Private | Independent | China | XYZ | XYZ | |
| CNOOC Energy Conservation and Environmental Protection Service Co Ltd | Private | Subsidiary (of CNOOC Energy Technology & Services Ltd ) | China | XYZ | XYZ | |
| China Offshore Oil Corporation E&P Mexico SAPI de CV | Private | Subsidiary (of CNOOC Ltd ) | Mexico | XYZ | XYZ | |
| Halliday Fraser Munro Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Shenyang Yuanda Compressor Co., Ltd. | Private | Subsidiary (of Burckhardt Compression Holding AG ) | China | XYZ | XYZ | |
| Technip Engineering Consultant (Shanghai) Co. Ltd. | Private | Subsidiary (of TechnipFMC Plc ) | China | XYZ | XYZ | |
| Texas American Resources Asia Ltd | Private | Subsidiary (of Texas American Resources LLC ) | China | XYZ | XYZ | |
| Shanghai Iron Man Fire Fighting Equipment Co Ltd | Private | Independent | China | XYZ | XYZ |
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