| Company Name | Type | Status |
|---|---|---|
| TRISTONE LIMITED | Private company limited by shares | Dissolved |
| TRI-STONE LIMITED | Private company limited by shares | Dissolved |
| TRI-STONE MANUFACTURING COMPANY LIMITED | Private company limited by shares | Live |
| TRISTONE RESOURCES LIMITED | Private company limited by shares | Live |
| TRI-STONE TECHNOLOGIES LIMITED | Private company limited by shares | Dissolved |