| TianDi Systems Company Limited | Private company limited by shares | Dissolved |
| TIANLONG SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| TIOS SYSTEMS LIMITED | Private company limited by shares | Live |
| TLINE SYSTEMS LIMITED | Private company limited by shares | Live |
| TONTER SYSTEMS LIMITED | Private company limited by shares | Live |
| TOPMIND SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| BIZ TRAC SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| TRADE SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| QHC Systems Trade Limited | | Live |
| TRANSCENDENTAL SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| TRANSLINK SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| HOP ON FAT TRANSPORT SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| CNT TRANSPORT SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| TRANS-PORT SYSTEMS LIMITED | Private company limited by shares | Live |
| PENFIELD LIQUID TREATMENT SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| TRENDLY SYSTEMS LIMITED | Private company limited by shares | Live |
| TRICAM SYSTEMS LIMITED | Private company limited by shares | Live |
| TRICONEX SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| TRINITY SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| TRINITY CARPET SYSTEMS LIMITED | Private company limited by shares | Live |
| TRIPLE R SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| TRUSTED SYSTEMS LIMITED | Private company limited by shares | Live |
| TXTC SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| Tyneham Systems Limited | Private company limited by shares | Live |
| uLab Systems Asia Limited | Private company limited by shares | Live |
| ULTRAFLEX SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| ULTRAFLEX SYSTEMS (ASIA) LIMITED | Private company limited by shares | Dissolved |
| UNITEX SYSTEMS LIMITED | Private company limited by shares | Live |
| UNI-WORLD SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| UPLEX SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| Utiliti Systems Limited | Private company limited by shares | Live |
| VAAB SYSTEMS LIMITED | Private company limited by shares | Live |
| VACUUM SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| NET VEIN SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| VENTRONICS SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| Versatech Systems Limited | Private company limited by shares | Live |
| VESTA SYSTEMS LIMITED | Private company limited by shares | Live |
| VICTOR CNC SYSTEMS COMPANY LIMITED | Private company limited by shares | Dissolved |
| Vierzen Systems Limited | Private company limited by shares | Live |
| VIEWLINK SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| VIRTUAL SYSTEMS ASIA LIMITED | Private company limited by shares | Dissolved |
| Virtual Team Systems Limited | Private company limited by shares | Live |
| Wafer Systems Limited | Private company limited by shares | Live |
| Wafer Systems (Asia) Limited | Private company limited by shares | Live |
| TAI ON WATERPROOFING SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| WINCHESTER SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| WINCUBE SYSTEMS LIMITED | Private company limited by shares | Live |
| WIND-FORCE SYSTEMS COMPANY LIMITED | Private company limited by shares | Live |
| WISER SYSTEMS COMPANY LIMITED | Private company limited by shares | Dissolved |
| WITS SYSTEMS LIMITED | Private company limited by shares | Live |
| XPEDITE SYSTEMS LIMITED | Private company limited by shares | Live |
| XTRA SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| XYNET SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| ZINIZ SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| ZONE SYSTEMS ASIA LIMITED | Private company limited by shares | Live |
| ZoneTech Systems Limited | Private company limited by shares | Live |
| Zwicker Systems Limited | Private company limited by shares | Live |
| SystemSeed Limited | Private company limited by shares | Live |
| Systemskin Limited | Private company limited by shares | Live |
| SYSTEMSOFT LIMITED | Private company limited by shares | Dissolved |
| SYSTEMSPELL CO. LIMITED | Private company limited by shares | Dissolved |
| SYSTEMSYS LIMITED | Private company limited by shares | Dissolved |
| JWEI SYSTEMTECHNIK LIMITED | Private company limited by shares | Live |
| SYSTEMTEQ LIMITED | Private company limited by shares | Dissolved |
| SYSTRADE SYSTEMWORKS LIMITED | Private company limited by shares | Dissolved |
| Systemwurx Limited | | Live |
| SYSTEO COMPANY LIMITED | Private company limited by shares | Dissolved |
| POWER FORCE SYSTERMS LIMITED | Private company limited by shares | Live |
| MIN SYSTERS TEHUS LIMITED | Private company limited by shares | Dissolved |
| SYSTEX LIMITED | Private company limited by shares | Dissolved |
| SYSTEX ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Systex Solutions (HK) Limited | Private company limited by shares | Live |
| SYSTEX INFORMATION (H.K.) LIMITED | Private company limited by shares | Live |
| SYSTEX INTERNATIONAL GROUP LIMITED | Private company limited by shares | Live |
| SYSTIME LIMITED | Private company limited by shares | Dissolved |
| Systime Limited | Private company limited by shares | Live |
| SYSTOMIC LIMITED | Private company limited by shares | Dissolved |
| SYSTON LIMITED | Private company limited by shares | Dissolved |
| SYSTON COMPONENTS (ASIA) LIMITED | Private company limited by shares | Dissolved |
| SYSTONE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SYSTRA ASIA PACIFIC LIMITED | Private company limited by shares | Live |
| Systra Technologies Limited | Private company limited by shares | Live |
| SYSTROL MANUFACTURING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYSTROME NETWORKS LIMITED | Private company limited by shares | Live |
| SYSTRON LIMITED | Private company limited by shares | Dissolved |
| Systronic I.T. Solutions Limited | Private company limited by shares | Live |
| GL SYSU Hospital HK Holdings Limited | Private company limited by shares | Live |
| SYS-UNITED LIMITED | Private company limited by shares | Dissolved |
| Sysvideo Technology Limited | Private company limited by shares | Live |
| SYSVR LIMITED | | Live |
| SYSVR TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SYSWARD ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| SYSWAVE LIMITED | Private company limited by shares | Live |
| SYSWELL INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SYSWIN Limited | Private company limited by shares | Live |
| Hong Kong Syswin Co., Limited | | Live |
| SYSWIN INTERNATIONAL PROPERTY MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| A & J SYSWORKS LIMITED | Private company limited by shares | Dissolved |
| SYSY District Company Limited | Private company limited by shares | Dissolved |
| SYTA TECHNOLOGY LIMITED | Private company limited by shares | Live |