| O.P.S. LIMITED | Private company limited by shares | Dissolved |
| Ops5 Limited | Private company limited by shares | Dissolved |
| OPSAP LIMITED | Private company limited by shares | Live |
| OpSec Cloud Limited | | Live |
| OPSEN BELL (CHINA) INVESTMENT CO., LIMITED | Private company limited by shares | Live |
| HONGKONG OPSEN (GROUP) LIMITED | Private company limited by shares | Live |
| OPSEN TRADING LIMITED | Private company limited by shares | Live |
| Opshine Technology Company Limited | Private company limited by shares | Live |
| OPSIS TECHNOLOGIES GROUP (HK) LIMITED | Private company limited by shares | Dissolved |
| Opslea Beauty & Spa Limited | Private company limited by shares | Live |
| OpsMasta Limited | Private company limited by shares | Live |
| Opsobjects Limited | Private company limited by shares | Live |
| Opson Company Limited | Private company limited by shares | Live |
| Opson (Hong Kong) International Trading Co., LIMITED | Private company limited by shares | Live |
| OPSON TECHNOLOGY LIMITED | Private company limited by shares | Live |
| OPSREADY LIMITED | Private company limited by shares | Live |
| OPSVIEW (HK) LIMITED | Private company limited by shares | Live |
| OpsVista Systems Limited | Private company limited by shares | Live |
| Opsweet Bakery Company Limited | | Live |
| OpSynergy Limited | | Live |