| JANSEN LIMITED | Private company limited by shares | Live |
| JANJIC, JANSEN ASSOCIATES LIMITED | Private company limited by shares | Live |
| NEW JANSEN CO., LIMITED | Private company limited by shares | Live |
| Jansen Corporation Limited | Private company limited by shares | Live |
| JANSEN HOLDING LIMITED | Private company limited by shares | Dissolved |
| Jansen Holding Limited | Private company limited by shares | Live |
| JANSEN INTERNATIONAL HOLDING LIMITED | Private company limited by shares | Live |
| JANSEN HONG KONG CO. LIMITED | Private company limited by shares | Dissolved |
| JANSEN INTERNATIONAL HONG KONG LIMITED | Private company limited by shares | Live |
| JANSEN INTERNATIONAL LIMITED | Private company limited by shares | Live |
| JANSEN INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| JANSEN LAW & MALCOLM CO., LIMITED | Private company limited by shares | Live |
| JANSEN TECHNOLOGIES LIMITED | Private company limited by shares | Live |
| Jansen Technology International Limited | Private company limited by shares | Dissolved |
| JANSEN TRADING LIMITED | Private company limited by shares | Dissolved |
| JANSEN INT'L TRADING HK LIMITED | Private company limited by shares | Live |
| JANSEN VENTURE LIMITED | Private company limited by shares | Live |