| OPEC ELECTRONICS HONG KONG LIMITED | Private company limited by shares | Dissolved |
| OPEC ENERGY HONGKONG LIMITED | Private company limited by shares | Live Commenced dormancy on 10-May-2016 |
| OPEC ENGINEERING LIMITED | Private company limited by shares | Live |
| OPEC HOLDING GROUP LIMITED | Private company limited by shares | Live |
| OPEC (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| OPEC TRADING LIMITED | Private company limited by shares | Live |
| OPEC INTERNATIONAL TRADING COMPANY LIMITED | Private company limited by shares | Live |
| OPECO LIMITED | Private company limited by shares | Dissolved |
| OPECOCEAN ENERGY (HK) LIMITED | | Live |
| OPECUOM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |