| MASTO LIMITED | Private company limited by shares | Dissolved |
| MASTO LIMITED | Private company limited by shares | Live |
| MASTODON GAIN LIMITED | Private company limited by shares | Dissolved |
| MASTODON INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| MASTOL LIMITED | Private company limited by shares | Dissolved |
| MASTON LIMITED | Private company limited by shares | Live |
| MASTON ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| MASTONE (CHINA) LIMITED | Private company limited by shares | Live |
| MASTONE GROUP LIMITED | Private company limited by shares | Live |
| MASTONE INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| Mastone Tech Limited | | Live |
| MASTOP LIMITED | Private company limited by shares | Dissolved |
| MASTOP INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| MASTOR SERVICE CENTRE LIMITED | Private company limited by shares | Live |
| Mastor Technology Limited | Private company limited by shares | Live |
| MASTORK GROUP LIMITED | | Live |
| MastorTech Limited | Private company limited by shares | Live |