| 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 |
| FILCO SYSTEM COMPANY LIMITED | Private company limited by shares | Live |
| GERMANY ZHONGQI FILTER SYSTEM (CHINA) INVESTMENT LIMITED | Private company limited by shares | Live |
| Finetec System Limited | Private company limited by shares | Live |
| SYSTEM FINITY LIMITED | | Live |
| Fiozhen System Limited | | Live |
| FIRMUS SYSTEM LIMITED | Private company limited by shares | Live |
| Firsat System Limited | Private company limited by shares | Dissolved |
| FIRST SYSTEM LIMITED | Private company limited by shares | Live |
| SYSTEM FOCUS LIMITED | Private company limited by shares | Dissolved |
| JC SYSTEM FOOTWEAR LIMITED | Private company limited by shares | Dissolved |
| FORD SYSTEM LIMITED | Private company limited by shares | Live |
| SYSTEM FORD LIMITED | Private company limited by shares | Dissolved |
| FORE-TECH SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| FREE MOLDING SYSTEM LIMITED | Private company limited by shares | Dissolved |
| LAS FREIGHT SYSTEM LIMITED | Private company limited by shares | Live |
| AXISS FREIGHT SYSTEM LIMITED | Private company limited by shares | Live |
| FREIGHTLINK SYSTEM LIMITED | Private company limited by shares | Dissolved |
| AXISS FRIGHT SYSTEM LIMITED | Private company limited by shares | Live |
| Frontiers System Limited | Private company limited by shares | Live |
| FULBOND DIGITAL SYSTEM LIMITED | Private company limited by shares | Dissolved |
| FUNCTIONAL MATRIX SYSTEM (HOLDING) LIMITED | Private company limited by shares | Live |
| TCL SYSTEM FURNITURE LIMITED | Private company limited by shares | Dissolved |
| GAEA SYSTEM LIMITED | Private company limited by shares | Live |
| GALAXY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| GALAXY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| GALAXY SYSTEM (ASIA) LIMITED | Private company limited by shares | Live |
| GARLAND SYSTEM LIMITED | Private company limited by shares | Live |
| Garland Digital System Limited | Private company limited by shares | Live |
| SYSTEM GENERAL LIMITED | Private company limited by shares | Live |
| GLOBALTECH SYSTEM LIMITED | Private company limited by shares | Live |
| GLORY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SYSTEM GLORY LIMITED | Private company limited by shares | Live |
| GLORY SYSTEM LIMITED | | Live |
| GLORY SYSTEM (ASIA) LIMITED | Private company limited by shares | Dissolved |
| GOLD SYSTEM LIMITED | Private company limited by shares | Dissolved |
| GOLD SYSTEM LIMITED | Private company limited by shares | Dissolved |
| GOLD SYSTEM LIMITED | Private company limited by shares | Live |
| GOLD SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| GOLD SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Live |
| GOLD SYSTEM INVESTMENTS LIMITED | Private company limited by shares | Live |
| GRAND SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| GRAND SYSTEM LIMITED | Private company limited by shares | Dissolved |
| GRAND SYSTEM LIMITED | Private company limited by shares | Live |
| HANSUNG SYSTEM LIMITED | Private company limited by shares | Dissolved |
| HAPPY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| HAPPY SYSTEM LIMITED | Private company limited by shares | Live |
| HARBOUR SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SYSTEM HILL LIMITED | Private company limited by shares | Dissolved |
| HI-TECH SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| MULTI-SOLUTION NETWORK & SYSTEM (H.K.) LIMITED | Private company limited by shares | Dissolved |
| ULTIMATE DISPLAY SYSTEM (HK) LIMITED | Private company limited by shares | Dissolved |
| HKE-navigation system Limited | Private company limited by shares | Dissolved |
| LSM System Holding Limited | Private company limited by shares | Dissolved |
| SKY SYSTEM INVESTMENT HOLDING LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Akros LDS system Holdings Limited | | Live |
| HOLY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| HONEST SYSTEM LIMITED | Private company limited by shares | Live |
| HONG KONG AUTOWAY SYSTEM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Cleaning System Limited | Private company limited by shares | Live |
| HONG KONG MICROELECTRONICS SYSTEM CO., LIMITED | Private company limited by shares | Live |
| HONG KONG PRECISION SYSTEM CO., LIMITED | Private company limited by shares | Live |
| HONG KONG SUNDY SYSTEM CO., LIMITED | Private company limited by shares | Live |
| HONG KONG HI-TECH AQUARIUM SYSTEM LIMITED | Private company limited by shares | Live |
| FUNCTIONAL MATRIX SYSTEM (HONG KONG) LIMITED | Private company limited by shares | Live |
| Perfection Aligner System Hong Kong Limited | Private company limited by shares | Live |
| HONG KONG PAGING SYSTEM, LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Rapid Transit System Limited | | Live |
| HONG KONG TONGBEI SYSTEM LIMITED | Private company limited by shares | Dissolved |
| HONG KONG TOTAL SECURITY SYSTEM CO. LIMITED | Private company limited by shares | Dissolved |
| HONG KONG ALGO TRADING SYSTEM LIMITED | Private company limited by shares | Live |
| HORIZON SYSTEM LIMITED | Private company limited by shares | Live |