| Tanza Limited | Private company limited by shares | Live |
| Tanzan Company Limited | Private company limited by shares | Live |
| Hong Kong Tanzang Technology Co., Limited | | Live |
| DIVERSE TANZANIA LIMITED | Private company limited by shares | Live |
| DIVERSIFIED MINERAL RESOURCES (TANZANIA) LIMITED | Private company limited by shares | Dissolved |
| TANZANIA ESTATES LIMITED | Private company limited by shares | Live |
| Tanzanian Rural Electric Company Limited | Private company limited by shares | Live |
| Tanzanian Goldfields Company Limited | Private company limited by shares | Live |
| TANZANITE COMPANY LIMITED | Private company limited by shares | Live |
| TANZANITE (H.K.) LIMITED | Private company limited by shares | Live |
| Tanzanite Hong Kong Investment Limited | Private company limited by shares | Dissolved |
| Tanzanite International Limited | | Live |
| TANZANITE INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| TANZANITE INVESTMENT LIMITED | Private company limited by shares | Live |
| TANZANITE NATION LIMITED | Private company limited by shares | Live |
| Tanzanite Online Limited | Private company limited by shares | Live |
| TANZANITE PARTNERS LIMITED | Private company limited by shares | Live |
| TANZANITE MEDIA PARTNERS LIMITED | Private company limited by shares | Live |
| Tanzanite Sales Support Limited | Private company limited by shares | Dissolved |
| TANZANIUM COMPANY LIMITED | Private company limited by shares | Dissolved |