| SUPER UNION LIMITED | Private company limited by shares | Live |
| INTERNATIONAL BRAND UNION GROUP (H.K.) LIMITED | Private company limited by shares | Dissolved |
| UNION WILL LIMITED | Private company limited by shares | Live |
| UNION WAY ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| UNION LEADER INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| UNIPHARM INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNITARP CO., LIMITED | Private company limited by shares | Dissolved |
| SUNFIELD UNIVERSAL LIMITED | Private company limited by shares | Live |
| GRAND UNION CONSTRUCTION ENG. LIMITED | Private company limited by shares | Dissolved |
| JOY UNION INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| UNION WIDE INVESTMENT LIMITED | Private company limited by shares | Live |
| GRACE UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNITY TRAVEL LIMITED | Private company limited by shares | Live |
| UNIVERSAL OPTICAL SERVICE CENTRE LIMITED | Private company limited by shares | Dissolved |
| HKC UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| Ever Union Services Development Limited | Private company limited by shares | Live |
| UNICORP (HONG KONG) PTE LIMITED | Private company limited by shares | Live |
| UNIGLOBE PRODUCTIONS LIMITED | Private company limited by shares | Dissolved |
| ROY UNION INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| UNION EDUCATION MANAGEMENT LIMITED | Private company limited by shares | Live |
| SMART UNION CHINA INVESTMENTS LIMITED | Private company limited by shares | Live |
| UNION MEDICAL SCIENTIFIC LIMITED | Private company limited by shares | Dissolved |
| RIGHT UNION INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| TOP UNION HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| MAIN UNION INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| UNI-HEALTH COMPANY LIMITED | Private company limited by shares | Dissolved |
| SUPREME UNION INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNION AUDIO SYSTEMS INTERNATIONAL INC. LIMITED | Private company limited by shares | Dissolved |
| RICH UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| FIRST UNION (H.K.) LIMITED | Private company limited by shares | Dissolved |
| UNION HEART DEVELOPMENT LIMITED | Private company limited by shares | Live |
| HONG KONG PROSPERITY UNION TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIPRO SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| Union International Development Limited | Private company limited by shares | Live |
| UNION PROFIT INDUSTRIES LIMITED | Private company limited by shares | Live |
| STAR UNIVERSE SECRETARIES LIMITED | Private company limited by shares | Live |
| UNICARE LIMITED | Private company limited by shares | Live |
| GAIN UNION INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNION HANG YIP CO LIMITED | Private company limited by shares | Dissolved |
| NETWORK UNION ENGINEERING LIMITED | Private company limited by shares | Live |
| STAR UNION (H.K.) LIMITED | Private company limited by shares | Dissolved |
| STAR UNION INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNION LEGEND DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION SINO (H.K.) LIMITED | Private company limited by shares | Dissolved |
| UNION SINO INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| CHAMPION UNION (CHINA) COMPANY LIMITED | Private company limited by shares | Live |
| UNION BEST INDUSTRIAL (HK) LIMITED | Private company limited by shares | Dissolved |
| UNION CHEMICALS ENTERPRISE COMPANY LIMITED | Private company limited by shares | Live |
| UNION SMART INVESTMENT LIMITED | Private company limited by shares | Live |
| SMART UNION LOGISTICS LIMITED | Private company limited by shares | Live |
| ASIA PACIFIC UNION TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| ELITE UNION ASIA LIMITED | Private company limited by shares | Dissolved |
| UNION SINO DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION DEVELOPMENT CHEMICAL TECHNOLOGY CORPORATION LIMITED | Private company limited by shares | Dissolved |
| UNISOFT IT LIMITED | Private company limited by shares | Live |
| Union Environmental Logistic Company Limited | Private company limited by shares | Dissolved |
| HL UNION INTERNATIONAL DEV. (H.K.) LIMITED | Private company limited by shares | Live |
| CHAT UNION CLIMAVENETA COMPANY LIMITED | Private company limited by shares | Live |
| JU CAI UNITED ENTERPRISE LIMITED | Private company limited by shares | Live |
| UNIQUE LINK COMPANY LIMITED | Private company limited by shares | Live |
| UNION (HONG KONG) TRADING CO. LIMITED | Private company limited by shares | Live |
| UNION BRIGHT TECHNOLOGY LIMITED | Private company limited by shares | Live |
| UNION EAST TECHNOLOGIES LIMITED | Private company limited by shares | Live |
| SHARP UNION ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| UNION AHEAD INVESTMENT LIMITED | Private company limited by shares | Live |
| GENIUS UNION LIMITED | Private company limited by shares | Dissolved |
| SUCCESS UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNION CREATOR LIMITED | Private company limited by shares | Dissolved |
| WELL UNION ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| TIME UNION HOLDINGS LIMITED | Private company limited by shares | Live |
| UNION BUILDING MATERIAL LIMITED | Private company limited by shares | Dissolved |
| ELITE UNION (HONG KONG) LIMITED | Private company limited by shares | Live |
| HONG KONG FLY UNIVERSE COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION GLORY INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| CHIU YIN CHINA & U.S.A. UNION EDUCATION LIMITED | Private company limited by shares | Dissolved |
| UNITED ADVERTISING AND EXHIBITION LIMITED | Private company limited by shares | Live |
| UNITED TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| ZHONG HAI CHEER UNION ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL EXPRESS LIMITED | Private company limited by shares | Live |
| UNION-A WORKSHOP LIMITED | Private company limited by shares | Live |
| UNIVERSAL HEALTH ASSOCIATES LIMITED | Private company limited by shares | Live |
| UNION SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL BIO-MEDICAL GROUP LIMITED | Private company limited by shares | Dissolved |
| UNITED EASTERN LIMITED | Private company limited by shares | Live |
| FRANKI UNION REMITTANCE LIMITED | Private company limited by shares | Dissolved |
| NICE UNIVERSAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| EVER UNION GARMENT TRADING (HONGKONG) LIMITED | Private company limited by shares | Live |
| UNION PLAZA (SHANGHAI) INVESTMENT LIMITED | Private company limited by shares | Live |
| AFRICA UNION INTERNATIONAL DEVELOPMENT CO., LIMITED | Private company limited by shares | Dissolved |
| UNICCA COMPANY LIMITED | Private company limited by shares | Live |
| UNION NETWORK SHIPPING CO., LIMITED | Private company limited by shares | Live |
| HONG KONG CHINESE MEDICINE PRACTITIONERS UNIFIED ASSOCIATION LIMITED | Private company limited by shares | Dissolved |
| ALL HONG KONG MARCHING BAND UNION LIMITED | Company limited by guarantee | Live |
| UNISON ELECTRONIC TECHNOLOGIES LIMITED | Private company limited by shares | Dissolved |
| UNION BROKER LIMITED | Private company limited by shares | Live |
| EXCEL UNITED COMPANY LIMITED | Private company limited by shares | Live Ceased dormancy on 20-Oct-2015 |
| MEGA UNIVERSAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNITED METAL MANUFACTURING COMPANY LIMITED | Private company limited by shares | Live |
| GREAT UNION METALWARE MANUFACTURER (HK) LIMITED | Private company limited by shares | Dissolved |
| UNITAR INDUSTRIAL (HONG KONG) LIMITED | Private company limited by shares | Live |