| U.S.T. System Technology Limited | Private company limited by shares | Live |
| U-STAND BUSINESS COMPANY LIMITED | Private company limited by shares | Live |
| U-STAR COMPANY LIMITED | Private company limited by shares | Dissolved |
| U-STAR LIMITED | Private company limited by shares | Dissolved |
| Ustar Pcb Limited | Private company limited by shares | Live |
| USTAR COMPANY LIMITED | Private company limited by shares | Live |
| Ustar Ecommerce Limited | Private company limited by shares | Live |
| Ustar Learning Limited | Private company limited by shares | Live |
| USTAR SPORTS LIMITED | Private company limited by shares | Live |
| USTART COMPANY LIMITED | Private company limited by shares | Dissolved |
| USTART CHEMICALS LIMITED | Private company limited by shares | Live |
| U-START ELECTRONICS LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Ustarthing Electronics Co., Limited | | Live |
| USTAY.NET LIMITED | Private company limited by shares | Live |
| USTC HK LIMITED | Private company limited by shares | Live |
| USTCM (HONG KONG) LIMITED | | Live |
| US-TECH SUPPLY CO., LIMITED | | Live |
| USTECH-ASIA, LIMITED | Private company limited by shares | Live |
| USTEGRA LIMITED | | Live |
| USTEK HONG KONG LIMITED | Private company limited by shares | Dissolved |
| USTEMPlus Limited | Private company limited by shares | Live |
| ZELLWEGER USTER (HONG KONG) COMPANY LIMITED | Private company limited by shares | Dissolved |
| USTICA LIMITED | Private company limited by shares | Dissolved |
| USTINA INVEST LIMITED | Private company limited by shares | Live |
| USTINOV FASHION COMPANY LIMITED | Private company limited by shares | Dissolved |
| U-stone Global Freight Limited | | Live |
| USTONE INDUSTRIAL LIMITED | Private company limited by shares | Live |
| USTORY MANAGEMENT LIMITED | Private company limited by shares | Live |
| USTOY GRAIN LIMITED | Private company limited by shares | Live |
| USTRA LIMITED | Private company limited by shares | Live |
| U-STRONG COMPANY LIMITED | Private company limited by shares | Dissolved |
| UStudy Limited | Private company limited by shares | Live |