| PETROUS INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| PETROVAC LIMITED | Private company limited by shares | Dissolved |
| PETROVECTOR ENERGY LIMITED | Private company limited by shares | Live |
| PETROVENT LIMITED | Private company limited by shares | Dissolved |
| PETROWEST PROJECTS LLP CO., LIMITED | Private company limited by shares | Live |
| Petrowest Energy Limited | Private company limited by shares | Dissolved |
| Petroworld Services Limited | Private company limited by shares | Live |
| PetroX HK Limited | Private company limited by shares | Live |
| PETROX ASIA PTY LIMITED | Private company limited by shares | Live |
| PETROXA LIMITED | Private company limited by shares | Dissolved |
| PETROXY MUSTANG LIMITED | Private company limited by shares | Dissolved |
| PETROY LIMITED | Private company limited by shares | Dissolved |
| PetroZion Limited | Private company limited by shares | Live |