| Echos Limited | Private company limited by shares | Live |
| ECHO-SILK (HONG KONG) COMPANY LIMITED | | Live |
| ECHOSOFT LIMITED | Private company limited by shares | Dissolved |
| ECHO-SOUND LIMITED | Private company limited by shares | Dissolved |
| ECHO-SOUND MANUFACTURING (CHINA) LIMITED | Private company limited by shares | Dissolved |
| ECHO-SOUND PLASTIC LIMITED | Private company limited by shares | Dissolved |
| Echospace Limited | Private company limited by shares | Live |
| EchoSphere Limited | | Live |
| ECHOSTOCK LIMITED | Private company limited by shares | Dissolved |
| ECHOSTONE JEWEL CO. LIMITED | | Live |
| ECHOSUN LIMITED | Private company limited by shares | Dissolved |
| HK CBS Echosun Chunhui Education Technology Limited | | Live |