| WESTEC LIMITED | Private company limited by shares | Dissolved |
| WESTEC INNOVATION LIMITED | | Live |
| WESTECH LIMITED | Private company limited by shares | Dissolved |
| WESTECH LIMITED | Private company limited by shares | Dissolved |
| Westech Company Limited | Private company limited by shares | Live |
| WESTECH CONSULTANCY LIMITED | Private company limited by shares | Dissolved |
| WESTECH TECHNOLOGY DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| WESTECH ENGINEERING LIMITED | Private company limited by shares | Live Commenced dormancy on 25-Jan-2007 |
| WESTECH INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| WESTECH INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| WESTECH INTERNATIONAL DEVELOPMENT LIMITED | Private company limited by shares | Live |
| Westech International (HK) Limited | Private company limited by shares | Live |
| WESTECH INVESTMENT LIMITED | Private company limited by shares | Live |
| Westech Technology Limited | Private company limited by shares | Live |