| CENTURY BUSINESS SYSTEM LIMITED | Private company limited by shares | Dissolved |
| EVERICH BUSINESS SYSTEM LIMITED | Private company limited by shares | Live |
| Ezway Business System Company Limited | | Live |
| Feasible Business System Limited | Private company limited by shares | Dissolved |
| GENERAL BUSINESS SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SILVER BELL CALLING SYSTEM LIMITED | Private company limited by shares | Live |
| CANDY TOYS SYSTEM HK LIMITED | Private company limited by shares | Live |
| CAPITAL SYSTEM LIMITED | Private company limited by shares | Dissolved |
| CARETECH SYSTEM LIMITED | Private company limited by shares | Live |
| PO SAN CARPET SYSTEM LIMITED | Private company limited by shares | Live |
| CENTURY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SYSTEM CENTURY LIMITED | Private company limited by shares | Dissolved |
| CENTURY WAY SYSTEM LIMITED | Private company limited by shares | Live |
| CENTURY SYSTEM LIMITED | Private company limited by shares | Live |
| MIQ SUPPLY CHAIN SYSTEM LIMITED | Private company limited by shares | Dissolved |
| CHAMPION NETWORK SYSTEM LIMITED | Private company limited by shares | Dissolved |
| HK CHANGRUN AUTOMATION SYSTEM LIMITED | Private company limited by shares | Dissolved |
| CHARMING SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SNIPER CHART SYSTEM LIMITED | Private company limited by shares | Dissolved |
| CHASE SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Schwem Electronic (China) Automation System Limited | Private company limited by shares | Live |
| Chinaway System Limited | Private company limited by shares | Dissolved |
| Cimforce System (Asia) Company Limited | Private company limited by shares | Live |
| So Clean System Limited | Private company limited by shares | Live |
| Sky Cloud System Limited | Private company limited by shares | Live |
| Cloud-Tech System Limited | Private company limited by shares | Live |
| Cloudview Telecommunications System Limited | Private company limited by shares | Live |
| NINGBO KEEP BRAKE SYSTEM CO., LIMITED | Private company limited by shares | Live |
| DISCOVER DISPLAY SYSTEM (CHINA) CO., LIMITED | Private company limited by shares | Live |
| FRANCE LORAY IGNITION SYSTEM CO., LIMITED | Private company limited by shares | Live |
| NINGBO DRAGON SOLAR SYSTEM CO., LIMITED | Private company limited by shares | Dissolved |
| FRONTIER PRECISION SYSTEM CO., LIMITED | Private company limited by shares | Live |
| CONCORD SYSTEM LIMITED | Private company limited by shares | Live |
| SKYVIEW SYSTEM CONSULTANCY LIMITED | Private company limited by shares | Dissolved |
| JENSEN MANE SYSTEM CONTROL (HK) LIMITED | Private company limited by shares | Live |
| SYSTEM CRAFTS LIMITED | Private company limited by shares | Dissolved |
| CREATIVE SYSTEM LIMITED | Private company limited by shares | Live |
| CREATIVE SYSTEM LIMITED | | Live |
| Cruise of System Company Limited | Private company limited by shares | Live |
| CUBIC SYSTEM LIMITED | Private company limited by shares | Live |
| CYBER SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Cyber System Limited | Private company limited by shares | Live |
| CYBERCOM SYSTEM LIMITED | Private company limited by shares | Live |
| CYBERTECH SYSTEM LIMITED | Private company limited by shares | Dissolved |
| CYBERTECH SYSTEM LIMITED | Private company limited by shares | Live |
| DAILY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| DAILY SYSTEM LIMITED | | Live |
| DATANET SYSTEM LIMITED | Private company limited by shares | Live |
| Daten System Limited | | Live |
| DeconTech System Limited | Private company limited by shares | Live |
| DELTA SYSTEM LIMITED | Private company limited by shares | Live |
| ONLINE TO OFFLINE ADVERTISING SYSTEM DEVELOPMENT LIMITED | Private company limited by shares | Live |
| EASTERN SYSTEM DEVELOPMENTS LIMITED | Private company limited by shares | Dissolved |
| DIGITRACKING SYSTEM LIMITED | Private company limited by shares | Dissolved |
| DIGITAL DOMAIN NAME SYSTEM LIMITED | Private company limited by shares | Dissolved |
| DRAGON SYSTEM LIMITED | Private company limited by shares | Dissolved |
| DRAGON SYSTEM LIMITED | | Live |
| DRAGONLINK SYSTEM LIMITED | Private company limited by shares | Dissolved |
| DREAMPRO SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Digital SMATV and Security System Association (DSSA) Limited | Company limited by guarantee | Dissolved |
| EASTERN SYSTEM LIMITED | Private company limited by shares | Dissolved |
| EASY SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| EASY SYSTEM LIMITED | Private company limited by shares | Live |
| EASY SYSTEM APP LIMITED | Private company limited by shares | Live |
| ECCOM SYSTEM LIMITED | Private company limited by shares | Dissolved |
| ECHO SYSTEM LIMITED | Private company limited by shares | Dissolved |
| E-CIRCULAR SYSTEM LIMITED | Private company limited by shares | Live |
| EGENERAL SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SYSTEM ATS & ELECTRIC LIMITED | Private company limited by shares | Dissolved |
| PHOENIX ELECTRIC HEATING SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| ENERGY-TECH AUTOMATION SYSTEM LIMITED | Private company limited by shares | Live |
| HYDRO ELECTRIC POWER SYSTEM ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Orient Wave System Engineering Limited | Private company limited by shares | Live |
| SYSTEM ENGINEERS LIMITED | Private company limited by shares | Dissolved |
| SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| NEW SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| TOP SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| NEW SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| WIN SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Live |
| NEW SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Live |
| UNI SYSTEM ENTERPRISES LIMITED | | Live |
| ENVIRONTROL SYSTEM LIMITED | Private company limited by shares | Live |
| EQUITY SYSTEM LIMITED | Private company limited by shares | Live |
| eReading System Company Limited | Private company limited by shares | Dissolved |
| E-SMART SYSTEM LIMITED | Private company limited by shares | Live |
| KEY SYSTEM ESTATE LIMITED | Private company limited by shares | Dissolved |
| E-STOCK SYSTEM LIMITED | Private company limited by shares | Dissolved |
| ETCO SWITCHING SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| EURO-LINK SYSTEM LIMITED | Private company limited by shares | Live |
| Evertop System Company Limited | Private company limited by shares | Live |
| E-WAY SYSTEM LIMITED | Private company limited by shares | Live |
| EXCELLENT SYSTEM LIMITED | Private company limited by shares | Dissolved |
| EXCELLENT SYSTEM LIMITED | | Live |
| EXTRA SYSTEM COMPANY LIMITED | | Live |
| Extreme System Limited | Private company limited by shares | Live |
| FAIR SYSTEM LIMITED | Private company limited by shares | Live |
| FAIR SYSTEM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| FANCY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| FAST SYSTEM LIMITED | Private company limited by shares | Live |
| FAST SYSTEM LIMITED | | Live |