| USIAKO LIMITED | Private company limited by shares | Live |
| USIAN FASHION MANUFACTURING LIMITED | Private company limited by shares | Dissolved |
| USIC ENTERPRISES (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| USIGHT INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| USIGHT TRADE & INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| USIL LIMITED | Private company limited by shares | Live |
| USILAND Optronics (Hong Kong) LIMITED | | Live |
| HK Usilicone Industry Co., Limited | Private company limited by shares | Live |
| USIMBA GROUP LIMITED | Private company limited by shares | Live |
| USIMS Limited | | Live |
| USINE COMPANY LIMITED | Private company limited by shares | Live |
| DIRECT USINE LIMITED | Private company limited by shares | Dissolved |
| USING COMPANY LIMITED | Private company limited by shares | Live |
| USING FASHION COMPANY LIMITED | Private company limited by shares | Dissolved |
| HONG KONG USING CO., LIMITED | Private company limited by shares | Dissolved |
| U-SING INDUSTRIAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| Using International Company Limited | | Live |
| STOP USING PLASTIC LIMITED | Company limited by guarantee | Live |
| USING TRADING AND INVESTMENTS COMPANY LIMITED | Private company limited by shares | Dissolved |
| U-sino Co., Limited | Private company limited by shares | Live |
| USINO GROUP LIMITED | Private company limited by shares | Live |
| USINO INTERNATIONAL LIMITED | | Live |
| USINO PHARMACEUTICAL COMPANY LIMITED | Private company limited by shares | Live |
| USIOL (ASIA) TRADE & INVESTMENT LIMITED | Private company limited by shares | Live |
| USION COMPANY LIMITED | Private company limited by shares | Live |
| Usitrip Limited | Private company limited by shares | Live |