| SINN & LAM COMPANY LIMITED | Private company limited by shares | Live |
| SINN CONTRACTORS LIMITED | Private company limited by shares | Dissolved |
| KAY SINN INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| LORRAINE SINN MEDICAL COMPANY LIMITED | Private company limited by shares | Live |
| TUNG SINN BUDDHISM TAOISM SOCIETY LIMITED | Company limited by guarantee | Live |
| Jai Sinn Trading Limited | Private company limited by shares | Live |
| SINNA MEDICAL HEALTH HOLDING CO., LIMITED | Private company limited by shares | Live |
| Sinna Group Holdings Limited | Private company limited by shares | Live |
| HONGKONG SINNA FASHION LIMITED | | Live |
| JINHUA SINNA INTERNATIONAL TRADE CO., LIMITED | Private company limited by shares | Live |
| SINNALBA (HK) LIMITED | Private company limited by shares | Live |
| SINNAM COSMETICS COMPANY LIMITED | Private company limited by shares | Dissolved |
| SINNAZA GROUP (HK) HOLDING LIMITED | Private company limited by shares | Dissolved |
| SINNER 47 LIMITED | Private company limited by shares | Dissolved |
| SINNET CLOUD HK LIMITED | Private company limited by shares | Live |
| SINNET GLOBAL TRADING LIMITED | Private company limited by shares | Live |
| Sinnet International Limited | Private company limited by shares | Live |
| SINNET INVESTMENTS LIMITED | Private company limited by shares | Live |
| SINNET OVERSEAS TRADING PVT LIMITED | Private company limited by shares | Live |
| SINNEX LIMITED | Private company limited by shares | Live |
| SINNEX INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SINNEX INVESTMENT LIMITED | Private company limited by shares | Live |
| SINNHONG ELECTRONICS CO., LIMITED | Private company limited by shares | Live |
| HK SINNIETON OWNED LIMITED | Private company limited by shares | Live |
| Sinnika Limited | Private company limited by shares | Live |
| SINNIX LIMITED | Private company limited by shares | Dissolved |
| SINNIX ENTERPRISES LIMITED | Private company limited by shares | Live |
| SINNIX PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| SINNIYOM RESOURCES LIMITED | Private company limited by shares | Dissolved |
| Try Try Sinnn Limited | | Live |
| SINNO LIMITED | Private company limited by shares | Dissolved |
| SINNO CAPITAL COMPANY LIMITED | Private company limited by shares | Live |
| SINNOCO LIMITED | Private company limited by shares | Live |
| SINNOLABS LIMITED | Private company limited by shares | Live |
| SINNON ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| SINNON INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SINNOO TRADING LIMITED | Private company limited by shares | Live |
| Sinnotech HK Limited | Private company limited by shares | Live |
| SINNOTT LIMITED | Private company limited by shares | Dissolved |
| SINNOVATE CAPITAL LIMITED | Private company limited by shares | Live |
| SINNOVATION EDUCATION AND MANAGEMENT LIMITED | Private company limited by shares | Live |
| SINNOVATION TRADING (HONG KONG) LIMITED | Private company limited by shares | Live |
| Sinnovations International Limited | Private company limited by shares | Live |
| SINNY FASHION COMPANY LIMITED | Private company limited by shares | Live |
| HONG KONG BEAUTY SINNY CLOTHING LIMITED | Private company limited by shares | Live |
| SINNY INTERNATIONAL TRADING LIMITED | Private company limited by shares | Live |
| SINNY TEXTILE CO., LIMITED | Private company limited by shares | Live |