| TOURMALINE LIMITED | Private company limited by shares | Dissolved |
| TOURMALINE LIMITED | Private company limited by shares | Dissolved |
| Tourmaline Limited | Private company limited by shares | Live |
| Tourmaline Trading Co., Limited | | Live |
| Tourmaline Evolution Co., Limited | Private company limited by shares | Live |
| TOURMALINE FINANCE LIMITED | Private company limited by shares | Dissolved |
| H.K. TOURMALINE INT'L DEV. CO., LIMITED | Private company limited by shares | Dissolved |
| TOURMALINE HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| CONGO TOURMALINE (HONG KONG) LIMITED | Private company limited by shares | Live |
| Hongkong Tourmaline Investment Co. Limited | Private company limited by shares | Live |
| Tourmaline Investment Holding Limited | Private company limited by shares | Live |
| Tourmaline River Shipping Limited | | Live |