| LONGYEAR LIMITED | Private company limited by shares | Dissolved |
| LONGYEAR PUBLISHING CO., LIMITED | Private company limited by shares | Dissolved |
| BOART LONGYEAR (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| LONGYEAR INDUSTRIAL (HK) LIMITED | Private company limited by shares | Live |
| LONGYEAR INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| LONGYEAR INTERNATIONAL LIMITED | Private company limited by shares | Live |
| HK LONGYEAR TECH. LIMITED | Private company limited by shares | Dissolved |
| LONGYEARS INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| LONGYEARS INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| LONGYEARS INVESTMENT LIMITED | Private company limited by shares | Dissolved |