| SINNO LIMITED | Private company limited by shares | Dissolved |
| SINNO CAPITAL COMPANY LIMITED | Private company limited by shares | Live |
| SINNOCO LIMITED | Private company limited by shares | Live |
| SINNOLABS LIMITED | Private company limited by shares | Live |
| SINNON ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| SINNON INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SINNOO TRADING LIMITED | Private company limited by shares | Live |
| Sinnotech HK Limited | Private company limited by shares | Live |
| SINNOTT LIMITED | Private company limited by shares | Dissolved |
| SINNOVATE CAPITAL LIMITED | Private company limited by shares | Live |
| SINNOVATION EDUCATION AND MANAGEMENT LIMITED | Private company limited by shares | Live |
| SINNOVATION TRADING (HONG KONG) LIMITED | Private company limited by shares | Live |
| Sinnovations International Limited | Private company limited by shares | Live |