| ECHO SEA LIMITED | Private company limited by shares | Dissolved |
| ECHO SKY LIMITED | Private company limited by shares | Dissolved |
| ECHO TOP LIMITED | Private company limited by shares | Dissolved |
| ECHO LIMITED | Private company limited by shares | Dissolved |
| ECHO NET LIMITED | Private company limited by shares | Dissolved |
| ECHO LIMITED | Private company limited by shares | Live |
| TOP ECHO LIMITED | Private company limited by shares | Live |
| NEW ECHO LIMITED | Private company limited by shares | Live |
| ECHO TOP LIMITED | Private company limited by shares | Dissolved |
| ECHO RAY LIMITED | Private company limited by shares | Live |
| JOY ECHO LIMITED | Private company limited by shares | Live |
| KEY ECHO LIMITED | Private company limited by shares | Live |
| BIG ECHO LIMITED | Private company limited by shares | Live |
| Echo Pro Limited | Private company limited by shares | Live |
| ECHO LIMITED | Private company limited by shares | Live |
| ECHO MAX LIMITED | Private company limited by shares | Live |
| ECHO & ECHO LIMITED | Private company limited by shares | Live |
| SEA ECHO LIMITED | Private company limited by shares | Live |
| HK ECHO LIMITED | Private company limited by shares | Live |
| Echo FX Limited | | Live |
| DRAGON ECHO LIMITED | Private company limited by shares | Dissolved |
| FIRST ECHO LIMITED | Private company limited by shares | Dissolved |
| GRAND ECHO LIMITED | Private company limited by shares | Live |
| Lico Echo Investment Limited | Private company limited by shares | Live |
| EASTERN ECHO TRADING LIMITED | Private company limited by shares | Dissolved |
| Winning Echo Limited | Private company limited by shares | Live |
| WISDOM ECHO LIMITED | Private company limited by shares | Live |
| Echo5 Limited | Private company limited by shares | Live |
| EchoBond Limited | Private company limited by shares | Dissolved |
| Echobox Limited | Private company limited by shares | Live |
| ECHOCARDIOGRAPHY (HONG KONG) LIMITED | Company limited by guarantee | Live |
| COLOUR-DOPPLER ECHOCARDIOGRAPHY LABORATORY LIMITED | Private company limited by shares | Dissolved |
| Chinese Society of Echocardiography Limited | | Live |
| Echocider Limited | Private company limited by shares | Live |
| ECHODYNE ELECTRONICS CORPORATION LIMITED | Private company limited by shares | Live |
| echoecho Limited | Private company limited by shares | Live |
| DRAGON ECHOES CO., LIMITED | | Live |
| ECHOES INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| Echoes Creative Limited | | Live |
| Delightful Echoes Investment Limited | Private company limited by shares | Live |
| ECHOES ON EARTH COMPANY LIMITED | Private company limited by shares | Live |
| ECHOES (HK) GROUP CO., LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Echoes Technology Co., Limited | | Live |
| ECHOES TRADING CO., LIMITED | Private company limited by shares | Live |
| ECHOES90 LIMITED | Private company limited by shares | Live |
| Echofex Limited | Private company limited by shares | Live |
| ECHO-GREAT LIMITED | Private company limited by shares | Live |
| Echoha Limited | Private company limited by shares | Live |
| ECHOICE LIMITED | Private company limited by shares | Dissolved |
| E-CHOICE LIMITED | Private company limited by shares | Dissolved |
| E-Choice Company Limited | Private company limited by shares | Live |
| CAPITAL ECHOICE LIMITED | Private company limited by shares | Live |
| E-CHOIZ LIMITED | Private company limited by shares | Dissolved |
| Echolectric Co., Limited | | Live |
| ECHOLIDAY COMPANY LIMITED | Private company limited by shares | Dissolved |
| ECHOLIDAY (HK) COMPANY LIMITED | Private company limited by shares | Dissolved |
| ECHOLOGY LIMITED | Private company limited by shares | Live |
| ECHOMARKS LIMITED | Private company limited by shares | Dissolved |
| ECHOMAX COMPANY LIMITED | Private company limited by shares | Live |
| ECHOMAX INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SHENZHEN ECHON TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Echonix Limited | Private company limited by shares | Live |
| ECHONOX LIMITED | Private company limited by shares | Dissolved |
| Happiness Echoo Limited | | Live |
| Echoose Industry Limited | Private company limited by shares | Live |
| ECHOPANS HANDPAN LIMITED | | Live |
| Echopharm Co., Limited | | Live |
| EchoRoaster Limited | Private company limited by shares | Live |
| 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 |
| Echotech Limited | | Live |
| ECHOTIME LIMITED | Private company limited by shares | Live |
| EchoTraverse Technology Co., Limited | | Live |
| ECHOUSE HK LIMITED | Private company limited by shares | Live |
| Echovisual Limited | Private company limited by shares | Live |
| ECHOVIVO LIMITED | Private company limited by shares | Live |
| ECHOW INVESTMENT CO., LIMITED | | Live |
| Echowall Limited | Private company limited by shares | Live |