| Company Name | Type | Status |
|---|---|---|
| C.S.Y. PUBLICATION COMPANY LIMITED | Private company limited by shares | Dissolved |
| C-SYduck Limited | Private company limited by shares | Live |
| HK CSY-ELECTRONICS CO., LIMITED | Private company limited by shares | Live |
| HK CSYL TRADE LIMITED | Private company limited by shares | Live |
| CSYS TRADING LIMITED | Live | |
| CSYT EnvironCon Company Limited | Private company limited by shares | Live |