| YIU TUNG (ENVIROTECH) LIMITED | Private company limited by shares | Dissolved |
| WONDERFUL ENVIRO-TECH LIMITED | Private company limited by shares | Dissolved |
| WOOD ENVIRO-TECH COMPANY LIMITED | Private company limited by shares | Dissolved |
| Shin Yang Envirotech Co., Limited | Private company limited by shares | Live |
| ENVIROTECK COMPANY LIMITED | Private company limited by shares | Live |
| EnviroTek Energy Technologies Limited | Private company limited by shares | Live |
| ENVIRO-TEK HONG KONG LIMITED | Private company limited by shares | Dissolved |
| ENVIROTEK INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ENVIROTEQ PACIFIC LIMITED | Private company limited by shares | Live |
| ENVIROTEST LIMITED | Private company limited by shares | Dissolved |
| ENVIRO-TRADE ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| EAST SEA ENVIRO-TRADE INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ENVIROTREAT LIMITED | Private company limited by shares | Dissolved |
| ENVIRO-TROL LIMITED | Private company limited by shares | Dissolved |
| Envirtech Group Limited | Private company limited by shares | Live |
| ENVIR-TECH HONGKONG LIMITED | Private company limited by shares | Live |
| ENVIRTECH INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SINOGRAND ENVIR-TECH LIMITED | Private company limited by shares | Dissolved |
| ENVIRTEK LIMITED | Private company limited by shares | Dissolved |