| SIENNA LIMITED | Private company limited by shares | Live |
| Sienna & Ian Co. Limited | Private company limited by shares | Live |
| SIENNA CAPITAL ASIA LIMITED | Private company limited by shares | Live |
| Sienna Charles Limited | Private company limited by shares | Live |
| JASPER DESERT SIENNA CONSULTING LIMITED | Private company limited by shares | Live |
| SIENNA CORPORATION LIMITED | Private company limited by shares | Dissolved |
| RAW SIENNA DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| Sienna Estates Limited | Private company limited by shares | Live |
| SIENNA FOREMOST COMPANY LIMITED | Private company limited by shares | Live |
| SIENNA HOLDINGS LIMITED | Private company limited by shares | Live |
| SIENNA HOME (HK) LIMITED | Private company limited by shares | Live |
| Hong Kong Sienna Trading Limited | Private company limited by shares | Live |
| SIENNA INTERNATIONAL (H.K.) LIMITED | Private company limited by shares | Live |
| Sienna International Trading Limited | Private company limited by shares | Live |
| SIENNA MICRO GROUP LIMITED | | Live |
| SIENNA MICRO TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SIENNA SERVICES LIMITED | Private company limited by shares | Live |
| SIENNA SNAKY LIMITED | Private company limited by shares | Live |
| Sienna Trading Company Limited | Private company limited by shares | Live |