| OPTECH LIMITED | Private company limited by shares | Dissolved |
| CHINTEK OPTECH LIMITED | Private company limited by shares | Live |
| Optech Co., Limited | Private company limited by shares | Live |
| OPTECH HEALTHCARE CO., LIMITED | Private company limited by shares | Dissolved |
| OPTECH ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| HK GENGMING OP-TECH COMPANY LIMITED | Private company limited by shares | Live |
| OP-TECH PHOENIX COMPANY LIMITED | Private company limited by shares | Dissolved |
| VARITRONIX OPTECH LIMITED | Private company limited by shares | Dissolved |
| WISE POWER OPTECH COMPANY LIMITED | Private company limited by shares | Live |