| OPTIMUM LIMITED | Private company limited by shares | Dissolved |
| OPTIMUM SKY LIMITED | Private company limited by shares | Live |
| OPTIMUM LIMITED | Private company limited by shares | Dissolved |
| OPTIMUM LIMITED | Private company limited by shares | Dissolved |
| JP OPTIMUM LIMITED | Private company limited by shares | Live |
| Optimum Limited | Private company limited by shares | Live |
| OPTIMUM SCF LIMITED | Private company limited by shares | Live |
| OPTIMUM COMPANY LIMITED | | Live |
| Optimum Accessories Limited | Private company limited by shares | Dissolved |
| OPTIMUM ADVANTAGE LIMITED | Private company limited by shares | Dissolved |
| OPTIMUM ALIVE LIMITED | Private company limited by shares | Live |
| CHINA OPTIMUM NANO INNOVATION ALLIANCE LIMITED | Private company limited by shares | Live |
| OPTIMUM ASSERTS LIMITED | Private company limited by shares | Live |
| OPTIMUM CREATIVE LIMITED | Private company limited by shares | Live |
| OPTIMUM DRAGON COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPTIMUM ENTERPRISES LIMITED | Private company limited by shares | Live |
| FAITHFUL OPTIMUM LIMITED | Private company limited by shares | Live |
| HW Optimum Healthcare Limited | Private company limited by shares | Dissolved |
| OPTIMUM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OPTIMUM INVESTMENT LIMITED | Private company limited by shares | Live |
| ORIENTAL OBSIDIAN OPTIMUM ORGANIZATION GROUP LIMITED | Private company limited by shares | Dissolved |
| OPTIMUM ORIENT LIMITED | Private company limited by shares | Live |
| OPTIMUM POINT HK LIMITED | Private company limited by shares | Live |
| OPTIMUM POWER LIMITED | Private company limited by shares | Live |
| OPTIMUM RESEARCH LIMITED | Private company limited by shares | Dissolved |
| Optimum Software Limited | Private company limited by shares | Live |
| OPTIMUM SOLAR LIMITED | Private company limited by shares | Live |
| OPTIMUM SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| OPTIMUM SUCCESS LIMITED | Private company limited by shares | Dissolved |
| Gold Tech Optimum Limited | Private company limited by shares | Dissolved |
| OPTIMUM TOYS LIMITED | Private company limited by shares | Dissolved |
| OPTIMUM TRADE LIMITED | Private company limited by shares | Live |
| OPTIMUM VISION LIMITED | Private company limited by shares | Dissolved |
| OPTIMUM VISION ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| WEALTH OPTIMUM LIMITED | Private company limited by shares | Live |
| OptimumFlow Limited | | Live |
| OPTIMUMNANO ENERGY CO., LIMITED | Private company limited by shares | Live |
| OptimumX Company Limited | Private company limited by shares | Live |