| SO-IN WILLEY EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| Soina Limited | | Live |
| Soina Education Consulting Co., Limited | Private company limited by shares | Live |
| So-Ingenious Limited | Private company limited by shares | Live |
| SOINHOLD INTERNATIONAL HOLDING CO., LIMITED | Private company limited by shares | Dissolved |
| DE SOINS CONSULTANCY LIMITED | Private company limited by shares | Live |
| Sointechk Trading Limited | Private company limited by shares | Live |
| SOIREE LIMITED | Private company limited by shares | Dissolved |
| Soiree Bar Limited | Private company limited by shares | Live |
| SOIS TRADE LIMITED | Private company limited by shares | Live |
| HongKong SOISHIRA Trading Co., Limited | | Live |
| SOIT INT'L CO., LIMITED | Private company limited by shares | Live |
| SOIT-IL Co., Limited | Private company limited by shares | Live |
| SOIXANTE LIMITED | Private company limited by shares | Dissolved |