| ONSON LIMITED | Private company limited by shares | Dissolved |
| ONSON LIMITED | Private company limited by shares | Live |
| ONSON ROBOTIC TECHNOLOGY CO., LIMITED | | Live |
| ONSON CONNECT LIMITED | Private company limited by shares | Live |
| ONSON CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| ONSON DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| ONSON DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| ONSON ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| ONSON ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Onson Engineering Limited | Private company limited by shares | Live |
| ONSON FOODS LIMITED | Private company limited by shares | Dissolved |
| ONSON GARMENTS LIMITED | Private company limited by shares | Dissolved |
| ONSON HOLDINGS LIMITED | Private company limited by shares | Live |
| ONSON INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| ONSON INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ONSON INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ONSON INTERNATIONAL ( H.K. ) LIMITED | Private company limited by shares | Dissolved |
| Onson International Holdings Limited | | Live |
| ONSON INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Onson Quantum (Asia) Limited | | Live |
| Onson Quantum Solutions Limited | | Live |
| Onson Quantum Technology Limited | | Live |
| ONSON SERVICES LIMITED | Private company limited by shares | Dissolved |
| ONSON TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| ONSON TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| ONSON TRADING LIMITED | Private company limited by shares | Dissolved |
| ONSON TRANSPORTATION COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONSON WORKS LIMITED | Private company limited by shares | Live |
| ONSONIC LIMITED | Private company limited by shares | Dissolved |