| Synsailing Limited | | Live |
| Synsasia Limited | Private company limited by shares | Live |
| Synsasia Group (Holding) Limited | Private company limited by shares | Live |
| Synsmooth Limited | | Live |
| SYNSOPHO LIMITED | Private company limited by shares | Live |
| SYNSPEC HONG KONG LIMITED | Private company limited by shares | Dissolved |
| SYNST ELECTRONICS (HONG KONG) LIMITED | Private company limited by shares | Live |
| SYNSTAK INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SYNSTAR PHARMA CO., LIMITED | Private company limited by shares | Dissolved |
| SYNSTAR PHARMATECH CO., LIMITED | Private company limited by shares | Dissolved |
| SYNSTAR INTERNATIONAL GROUP LIMITED | Private company limited by shares | Dissolved |
| SYNSTONES LIMITED | Private company limited by shares | Live |
| Synsun Investment Co., Limited | Private company limited by shares | Live |
| SYNSUN HEALTH CARE COMPANY LIMITED | Private company limited by shares | Live |
| Synsun Technology Limited | Private company limited by shares | Live |