| Hartmann Zu Limited | Private company limited by shares | Live |
| Hartmann Limited | Private company limited by shares | Live |
| HARTMANN CAPITAL LIMITED | Private company limited by shares | Live |
| Feng, Hartmann & Ran Limited | Private company limited by shares | Live |
| HARTMANN GLOBAL CONSULTANTS LIMITED | Private company limited by shares | Live |
| TWO Hartmann (HK) Limited | Private company limited by shares | Dissolved |
| HARTMANN VALVES (HK) LIMITED | Private company limited by shares | Live |
| HARTMANN VALVES (HK) LIMITED | Private company limited by shares | Live |
| HARTMANN INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| MICHAEL ULRICH HARTMANN INVESTMENT LIMITED | Private company limited by shares | Live |
| HARTMANN INTERNATIONAL TRADING LIMITED | Private company limited by shares | Live |