| SYSCOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| Syscom Group Limited | Private company limited by shares | Live |
| SYSCOM HONG KONG LIMITED | Private company limited by shares | Dissolved |
| Syscom Hong Kong Limited | | Live |
| SYSCOM INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SYSCOM INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SYSCOM INTERNATIONAL GROUP LIMITED | Private company limited by shares | Live |
| Syscom Networks Limited | Private company limited by shares | Live |
| SYSCOM TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SYSCOM CYBER TELECOMMUNICATION LIMITED | Private company limited by shares | Dissolved |
| SYSCOM-ELECTRONICS LIMITED | Private company limited by shares | Live |