| TUBO SYSTEM COMPUTER LIMITED | Private company limited by shares | Dissolved |
| TUBO TECHNOLOGY CONSTRUCTION COMPANY LIMITED | Private company limited by shares | Live |
| TUBO ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| Tubo Electronics Hongkong Limited | Private company limited by shares | Live |
| Tubo Industrial Limited | Private company limited by shares | Live |
| TUBOFLEX HVAC CO., LIMITED | Private company limited by shares | Live |
| Tuboflex International Trade Co., Limited | Private company limited by shares | Live |
| TUBOHOME INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| TUBOMART ENTERPRISE CO., LIMITED | Private company limited by shares | Live |
| TUBOMART (HONG KONG) ENTERPRISE CO., LIMITED | Private company limited by shares | Live |
| TUBONILL LIMITED | Private company limited by shares | Dissolved |
| ITALY TUBOSCOPE INT'L LIMITED | Private company limited by shares | Live |