| BMC Service System Limited | Private company limited by shares | Live |
| SYSTEM SERVICE LIMITED | Private company limited by shares | Live |
| I System Service Company Limited | Private company limited by shares | Live |
| SH System Service Company Limited | | Live |
| SYSTEM SHIPPING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYSTEM SHIPPING LIMITED | Private company limited by shares | Dissolved |
| SINOTEL SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SKYNET SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Smart One System Limited | Private company limited by shares | Live |
| SMART SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SYSTEM SMART LIMITED | Private company limited by shares | Live |
| SMARTCOM SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| SMARTHOME SYSTEM LIMITED | Private company limited by shares | Live |
| SYSTEM AND SOFTWARE LIMITED | Private company limited by shares | Dissolved |
| Top Solar System Limited | Private company limited by shares | Dissolved |
| System Solar Limited | Private company limited by shares | Dissolved |
| solar system number one Limited | Private company limited by shares | Live |
| SYSTEM SOLUTION LIMITED | Private company limited by shares | Dissolved |
| New Fly System Solution Company Limited | Private company limited by shares | Live |
| SA System Solution Limited | Private company limited by shares | Live |
| Forcewide Network System Solution Limited | Private company limited by shares | Dissolved |
| SYSTEM SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| NAC System Solutions Limited | Private company limited by shares | Live |
| System Pro AI Solutions Limited | Private company limited by shares | Live |
| SOUTH SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| SOUTH SYSTEM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SPECIAL SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SPORTS SYSTEM LIMITED | | Live |
| Standard System Limited | | Live |
| HK STARS SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SUCCESS SYSTEM LIMITED | Private company limited by shares | Live |
| SUCCESS SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| SUCCESS SYSTEM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SUNLIGHT SYSTEM INTEGRATION LIMITED | Private company limited by shares | Dissolved |
| SUNRISE SYSTEM COMPANY LIMITED | Private company limited by shares | Live |
| SUPERB SYSTEM LIMITED | | Live |
| B & L SYSTEM SUPPLY LIMITED | Private company limited by shares | Dissolved |
| TACLYGON SYSTEM LIMITED | Private company limited by shares | Live |
| E TACTIC SYSTEM LIMITED | Private company limited by shares | Dissolved |
| TEAMAX SYSTEM LIMITED | Private company limited by shares | Live |
| TECHBASE SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SYSTEM TECHNIK LIMITED | Private company limited by shares | Live |
| BC TECHNIWARE SYSTEM LIMITED | Private company limited by shares | Dissolved |
| YIKANG HEATING SYSTEM TECHNOLOGY LIMITED | | Live |
| TECH-PRO SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Tech-Trans System Limited | Private company limited by shares | Live |
| TECH-TRANS SYSTEM LIMITED | | Live |
| Tectonic System Limited | Private company limited by shares | Live |
| TERMITE BAITING SYSTEM LIMITED | Private company limited by shares | Dissolved |
| TerraMaster System Limited | Private company limited by shares | Live |
| TexAir System Limited | | Live |
| THEMOEDGE SYSTEM LIMITED | Private company limited by shares | Live |
| TIANKONG SYSTEM LIMITED | Private company limited by shares | Live |
| TICTAS SYSTEM AUTOMATION LIMITED | Private company limited by shares | Live |
| TIME SYSTEM LIMITED | Private company limited by shares | Dissolved |
| TIMES SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| HONG KONG TONGDA NETWORK SYSTEM LIMITED | Private company limited by shares | Dissolved |
| TRADE AIR SYSTEM LIMITED | Private company limited by shares | Live |
| SYSTEM TRADE LIMITED | Private company limited by shares | Dissolved |
| TRANSPORT SYSTEM LIMITED | Private company limited by shares | Live |
| EUROPEAN TRANSPORT SYSTEM LIMITED | Private company limited by shares | Dissolved |
| EUROSTAR TRANSPORT SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Transport System Solutions Limited | Private company limited by shares | Live |
| TRIBUTA SYSTEM LIMITED | Private company limited by shares | Live |
| TUBI P&D SYSTEM LIMITED | Private company limited by shares | Dissolved |
| TUEXE SYSTEM LIMITED | | Live |
| ULTRANET SYSTEM LIMITED | Private company limited by shares | Live |
| UltraTec System Limited | Private company limited by shares | Live |
| ULTRATEK SYSTEM LIMITED | Private company limited by shares | Live |
| UNIBEAN SYSTEM LIMITED | Private company limited by shares | Dissolved |
| UNICORN SYSTEM LIMITED | Private company limited by shares | Live |
| UNIFORCE SYSTEM LIMITED | Private company limited by shares | Live |
| VAST SYSTEM LIMITED | Private company limited by shares | Dissolved |
| VEBER SYSTEM LIMITED | Private company limited by shares | Dissolved |
| VICTOR SYSTEM LIMITED | Private company limited by shares | Live |
| China Audio & Video System Technology Association Limited | Private company limited by shares | Live |
| New Vision System Limited | Private company limited by shares | Live |
| VISION IT SYSTEM LIMITED | | Live |
| VOXUS SYSTEM (ASIA) LIMITED | Private company limited by shares | Dissolved |
| VPLUS SYSTEM LIMITED | Private company limited by shares | Live |
| Wasonic System Limited | Private company limited by shares | Dissolved |
| Wasonic System Limited | Private company limited by shares | Live |
| BURGEON WASTE SORTING SYSTEM LIMITED | Private company limited by shares | Live |
| WEALTHY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| WEALTHY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| WEALTHY SYSTEM LIMITED | Private company limited by shares | Live |
| WEILING SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Optimistic Whitening Legend System Company Limited | Private company limited by shares | Live |
| Hotwire Payment System World Limited | Private company limited by shares | Dissolved |
| Wuguang System Company Limited | Private company limited by shares | Live |
| YOUNG FURNITURE SYSTEM LIMITED | Private company limited by shares | Dissolved |
| ZENITH SYSTEM LIMITED | Private company limited by shares | Live |
| ZITEX SYSTEM LIMITED | Private company limited by shares | Live |
| System3 Solution Limited | Private company limited by shares | Live |
| SYSTEM4U LIMITED | Private company limited by shares | Dissolved |
| Systemair Tech Co., Limited | | Live |
| SYSTEMAIR (HK) LIMITED | Private company limited by shares | Live |
| SYSTEMAR LIMITED | | Live |
| SYSTEMART LIMITED | Private company limited by shares | Dissolved |
| SYSTEMATIC LIMITED | Private company limited by shares | Dissolved |