| SYTAC LIMITED | Private company limited by shares | Dissolved |
| SYTC HK Limited | | Live |
| SYTECH LIMITED | Private company limited by shares | Live |
| SYTEK SOLUTION LIMITED | Private company limited by shares | Live |
| SYTEX LIMITED | Private company limited by shares | Dissolved |
| SYTEX LIMITED | Private company limited by shares | Live |
| SYTHE LIMITED | Private company limited by shares | Dissolved |
| SYTHERA TRADE ASIA LIMITED | Private company limited by shares | Dissolved |
| SYTHNOSIS INVESTMENT HONG KONG LIMITED | Private company limited by shares | Dissolved |
| SYTING TRADE LIMITED | | Live |
| SYTNA LIMITED | Private company limited by shares | Live |
| SYTON TECHNOLOGY LIMITED | Private company limited by shares | Live |
| HK SYTONG LIMITED | Private company limited by shares | Live |
| Sytool Industrial Limited | Private company limited by shares | Live |
| SYT-SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| Sytun Machinery Limited | Private company limited by shares | Live |
| SYTYS Co., Limited | Private company limited by shares | Live |
| SYUAN SIN LIMITED | Private company limited by shares | Live |
| Syuan (HK) Limited | Private company limited by shares | Live |
| Ya Syuan International Limited | Private company limited by shares | Live |
| S-Yuan Electronic Technology Limited | | Live |
| HK SYUAN TRADE LIMITED | | Live |
| SYUAN TRADING CO., LIMITED | Private company limited by shares | Live |
| SYUAN TRADING CO., LIMITED | Private company limited by shares | Live |
| SYUAN INTERNATIONAL TRADING CO., LIMITED | Private company limited by shares | Live |
| SYUANTES LIMITED | | Live |
| SYUE Company Limited | Private company limited by shares | Live |
| SYUEN PUBLISHING LIMITED | Private company limited by shares | Dissolved |
| Syuen Resources (M) Investment Limited | Private company limited by shares | Live |
| Syuhai Limited | Private company limited by shares | Live |
| SYUKEE HAIR CO., LIMITED | Private company limited by shares | Live |
| SYU.LAIMEIZI (HONGKONG) INTERNATIONAL BIOTECHENOLOGY CO., LIMITED | Private company limited by shares | Live |
| SYUM LIMITED | Private company limited by shares | Dissolved |
| SyunDak Trading (Hong Kong) Co. Limited | Private company limited by shares | Live |
| Syuno Beauty Technology Limited | | Live |
| SYUNZAI CIRCULATION HONG KONG LIMITED | Private company limited by shares | Dissolved |
| SYU'S TRADING CO. LIMITED | Private company limited by shares | Live |
| HK SYUTPAAU INT'L GROUP LIMITED | Private company limited by shares | Live |
| SYUYU INDUSTRY LIMITED | Private company limited by shares | Live |
| SYVEX LIMITED | Private company limited by shares | Dissolved |
| Syvih Limited | | Live |
| SYVISION TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SYWOP TRADE LIMITED | Private company limited by shares | Live |
| SYWY TECHNOLOGY LIMITED | Private company limited by shares | Live |
| HONG KONG SYXNO INTERNATIONAL GROUP LIMITED | Private company limited by shares | Live |
| HK SYXY LIMITED | Private company limited by shares | Live |
| SYYZ LIMITED | Private company limited by shares | Live |
| SYZF COMPANY LIMITED | Private company limited by shares | Live |
| SYZS International (HK) Group Limited | | Live |
| SyZyGy Limited | Private company limited by shares | Live |
| SYZYGY POWER CO., LIMITED | Private company limited by shares | Dissolved |
| SYZYGY Cosmetics Limited | Private company limited by shares | Live |
| Syzygy Design Limited | | Live |
| Syzygy Life Limited | | Live |
| Syzygy Travel Limited | Private company limited by shares | Live |
| HONGKONG SYZZ INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| SYZZ TECHNOLOG LIMITED | | Live |