| ROCKSON LIMITED | Private company limited by shares | Dissolved |
| ROCKSON LIMITED | Private company limited by shares | Dissolved |
| ROCKSON LIMITED | Private company limited by shares | Live |
| ROCKSON (CHINA) COMPANY LIMITED | Private company limited by shares | Dissolved |
| ROCKSON ENTERPRISE LIMITED | Private company limited by shares | Live |
| ROCKSON INVESTMENT COMPANY, LIMITED | Private company limited by shares | Dissolved |
| ROCKSON INVESTMENT LIMITED | Private company limited by shares | Live |
| ROCKSON PIANO (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| ROCKSON ORGAN COMPANY LIMITED | Private company limited by shares | Live |
| ROCKSON PIANO COMPANY LIMITED | Private company limited by shares | Dissolved |
| ROCKSON PIANO COMPANY (YUEN LONG) LIMITED | Private company limited by shares | Dissolved |
| ROCKSON PIANO (MONGKOK) LIMITED | Private company limited by shares | Dissolved |
| ROCKSON PIANO (WANCHAI) LIMITED | Private company limited by shares | Dissolved |
| ROCKSON PIANO (WESTERN) LIMITED | Private company limited by shares | Dissolved |
| ROCKSON PIANO (MA ON SHAN) LIMITED | Private company limited by shares | Dissolved |
| ROCKSON TRADING LIMITED | Private company limited by shares | Dissolved |