| ONSI LIMITED | | Live |
| ONSIA ALUMINIUM WORK'S (H.K.) COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONSIA TRADING LIMITED | Private company limited by shares | Dissolved |
| Onsidai Logistics Co., Limited | | Live |
| ONSIDE ASIA LIMITED | Private company limited by shares | Dissolved |
| SHENZHEN ONSIDE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Onside Consulting Limited | | Live |
| Onside Group Limited | | Live |
| Onside Sports and Management Limited | | Live |
| Onside Partners Limited | Private company limited by shares | Live |
| Onsieve Limited | | Live |
| OnSign TV Limited | Private company limited by shares | Live |
| ONSING CONSULTANT LIMITED | Private company limited by shares | Live |
| OnSing Decoration (Hong Kong) Company Limited | Private company limited by shares | Live |
| ONSING TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ONSINO TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| OnSite Digital Limited | Private company limited by shares | Live |
| Onsite Far East Limited | Private company limited by shares | Live Commenced dormancy on 19-May-2015 |
| ON-SITE (HK) CO., LIMITED | Private company limited by shares | Dissolved |
| On-Site Design (Hongkong) Architectural Design Co., Limited | | Live |
| OnSite Infinity Limited | | Live |
| ONSITE SERVICES LIMITED | Private company limited by shares | Dissolved |
| Global Onsite Services Limited | Private company limited by shares | Live |
| ON-SITE WORLD AUXILIARIES LOGISTICS LIMITED | Private company limited by shares | Live |