| SIU4 COMPANY LIMITED | | Live |
| SiuBoBo Limited | Private company limited by shares | Live |
| SIUCHUNG COCONUT FOOD AND BEVERAGE LIMITED | Private company limited by shares | Live |
| SIUFAI INTERNATIONAL (HONGKONG) LIMITED | Private company limited by shares | Dissolved |
| LEE SIU-FUNG & COMPANY LIMITED | Private company limited by shares | Dissolved |
| Siuha Limited | | Live |
| Siuhokgai Trading Limited | | Live |
| SIUJIU PHOTO LIMITED | Private company limited by shares | Live |
| SIUJUN ENTERPRISES LIMITED | Private company limited by shares | Live |
| SI-UK Education Council Limited | Private company limited by shares | Dissolved |
| SI-UK Global Limited | Private company limited by shares | Live |
| SIUKAI TRADING LIMITED | Private company limited by shares | Live |
| Siuken Tech Company Limited | | Live |
| Siuling Boutique Co Limited | Private company limited by shares | Live |
| Siulobo Kitchen Cleaning Services Limited | Private company limited by shares | Live |
| SIULUN MEDHEART COMPANY LIMITED | Private company limited by shares | Live |
| SIUMAN INVESTMENT COMPANY LIMITED | | Live |
| SIUMING CONSTRUCTION LIMITED | Private company limited by shares | Live |
| SIUMING.PHOTO LIMITED | Private company limited by shares | Live |
| SiuMon Secretarial Business Limited | | Live |
| SiuMon Corporate Consultancy Limited | | Live |
| SIUN TRADE LIMITED | Private company limited by shares | Live |
| Siuol International Limited | | Live |
| 516 SIUON LIMITED | | Live |
| MAFEI SIUON LIMITED | | Live |
| Siupak Kong Trading Limited | | Live |
| SIUPIN Digital Limited | Private company limited by shares | Live |
| SIU'S P & M LIMITED | Private company limited by shares | Dissolved |
| SIU'S LIMITED | Private company limited by shares | Dissolved |
| SIU'S BROTHER INVESTMENT LIMITED | Private company limited by shares | Live |
| SIU'S BROTHERS LIMITED | Private company limited by shares | Dissolved |
| SIU'S GEM CORPORATION LIMITED | Private company limited by shares | Live |
| SIU'S ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| SIU'S ESTATE LIMITED | Private company limited by shares | Dissolved |
| SIU'S GARMENTS MANUFACTURING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIU'S GENERATION INVESTMENT LIMITED | Private company limited by shares | Live |
| SIUS GLOBAL LIMITED | Private company limited by shares | Dissolved |
| SIU'S (HON KEUNG) COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIU'S INTERNATIONAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIU'S INTERNATIONAL ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| SIU'S KING YIP PLASTICS LEATHER CO. LIMITED | Private company limited by shares | Dissolved |
| SIU'S MOTO LIMITED | | Live |
| SIU'S WATCH MANUFACTURER LIMITED | Private company limited by shares | Dissolved |
| Siusai Technology (HK) Co., Limited | Private company limited by shares | Live |
| SIUSHUNFA INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Siusiu Limited | | Live |
| Siusiu's Kitchen Company Limited | | Live |
| SIUSONG COMPANY LIMITED | Private company limited by shares | Live |
| SIUTAT LIMITED | Private company limited by shares | Live |
| SIUTEK INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SIUTO LIMITED | Private company limited by shares | Dissolved |
| SIUTO TRADING COMPANY LIMITED | Private company limited by shares | Live |
| Siuvo (Hong Kong) Limited | Private company limited by shares | Live |
| SIUYI.BIBI 43 LIMITED | | Live |
| Siuyin International Trading Company Limited | Private company limited by shares | Live |
| Siuyuen Industrial Co., Limited | | Live |