| Petroco Trading Limited | Private company limited by shares | Live |
| PETRO-COB LIMITED | Private company limited by shares | Dissolved |
| PETROCOCCHINO COMPANY LIMITED | Private company limited by shares | Dissolved |
| PETROCOM LIMITED | Private company limited by shares | Live |
| PETROCOM CBF LIMITED | Private company limited by shares | Dissolved |
| FSI PETROCOM LIMITED | Private company limited by shares | Live |
| Petrocom Global Aqua (China) Limited | Private company limited by shares | Dissolved |
| PETROCOM EXIM (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| Petrocom Hydrogen Limited | Private company limited by shares | Live |
| Petrocom Nano-carbon Limited | Private company limited by shares | Dissolved |
| PETROCORP LIMITED | Private company limited by shares | Live |
| PHOENIX PETROCORP HK LIMITED | Private company limited by shares | Live |