| ECOO LIMITED | | Live |
| ECOOFINITY Company Limited | | Live |
| Ecool Air Co. Limited | Private company limited by shares | Live |
| E-Cool Manufacturing Co., Limited | Private company limited by shares | Live |
| HK E-Cool Group Limited | Private company limited by shares | Live |
| eCOOL TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ECOOLINE COMMERCE & TRADE CO., LIMITED | Private company limited by shares | Live |
| ECOON TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| ECO-OP LIMITED | Company limited by guarantee | Dissolved |
| ECO-OPERATIONS LIMITED | Private company limited by shares | Dissolved |
| ECO-ORIGIN INDUSTRIAL LIMITED | Private company limited by shares | Live |