| HK S.Y.H LIMITED | Private company limited by shares | Live Commenced dormancy on 15-Aug-2018 |
| S.Y.H ENTERPRISE LIMITED | Private company limited by shares | Live |
| SYHANG CO. LIMITED | Private company limited by shares | Dissolved |
| SYHD ELECTRONIC CO., LIMITED | Private company limited by shares | Live |
| HK SYHDEE CO., LIMITED | Private company limited by shares | Dissolved |
| HK SYHDEE LIGHTING CO., LIMITED | Private company limited by shares | Live |
| SHENZHEN SYHDEE OPTOELECTRONICS TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Syheng Industry Co., Limited | | Live |
| SYHM Limited | | Live |
| SYHT LIMITED | Private company limited by shares | Live |