| UNISON INVESTMENT (HOLDINGS) LIMITED | Private company limited by shares | Live |
| ACE UNITED CO. LIMITED | Private company limited by shares | Dissolved |
| LINK UNION ASIA GROUP LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL OPTICAL TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| OCEAN UNION MANAGEMENT LIMITED | Private company limited by shares | Live |
| UNION4WORKSHOP LIMITED | Private company limited by shares | Dissolved |
| UNION ALPHA LIMITED | Private company limited by shares | Live |
| UNIVERSALEXPORTS PRO LIMITED | Private company limited by shares | Live |
| WAID UNION CO. LIMITED | Private company limited by shares | Live |
| UNITED SEA LIMITED | Private company limited by shares | Dissolved |
| UNITED MASTER LIMITED | Private company limited by shares | Live |
| UNION KIND INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ART UNION INVESTMENT LIMITED | Private company limited by shares | Live |
| SUPREME UNION HOLDINGS LIMITED | Private company limited by shares | Live |
| UNITED TM GROUP LIMITED | Private company limited by shares | Live |
| GRAND UNIVERSE LIMITED | Private company limited by shares | Dissolved |
| UNI-CHAMPION HONG KONG LIMITED | Private company limited by shares | Live |
| China Union Building Materials (HK) Company Limited | Private company limited by shares | Dissolved |
| UNI-SOFT SYSTEMS LIMITED | Private company limited by shares | Live |
| UNIWEALTH INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNION WORLD CAPITAL RESOURCES LIMITED | Private company limited by shares | Dissolved |
| SOUTH UNION ELECTRONICS CO., LIMITED | Private company limited by shares | Live |
| DRAGON UNION INVESTMENT LIMITED | Private company limited by shares | Live |
| HONG KONG UNION ASSOCIATION COMPANY LIMITED | Private company limited by shares | Live Commenced dormancy on 19-Feb-2016 |
| UNION HARVEST MARITIME COMPANY LIMITED | Private company limited by shares | Dissolved |
| GOOD UNION HOLDINGS LIMITED | Private company limited by shares | Live |
| TRUMP UNION INVESTMENT LIMITED | Private company limited by shares | Live |
| UNION MAX INVESTMENT LIMITED | Private company limited by shares | Live |
| UNIQUE WELL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNITED ASCENT INVESTMENT LIMITED | Private company limited by shares | Live |
| UNITED HONEST INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| CHAMPION UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| PACIFIC UNIVERSAL COMPANY LIMITED | Private company limited by shares | Live |
| SCU SWICREDI UNION LIMITED | Private company limited by shares | Live |
| PAN ASIA UNITED COMPANY LIMITED | Private company limited by shares | Dissolved |
| GRAND UNION INT'L INDUSTRIAL LIMITED | Private company limited by shares | Live |
| GRAND UNION TRADING DEVELOPMENT LIMITED | Private company limited by shares | Live |
| UNION SINCERE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNION STRONG INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| MERIT UNION INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SWIFT UNION INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL RICH LIMITED | Private company limited by shares | Live |
| Chinese United Investment Limited | Private company limited by shares | Live |
| UNIFOK TECHNOLOGY LIMITED | Private company limited by shares | Live |
| UNIVERSE INDUSTRIAL GROUP LIMITED | Private company limited by shares | Dissolved |
| RISE UNISON LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL GLORY COMPANY LIMITED | Private company limited by shares | Live |
| GAINWAY UNION LIMITED | Private company limited by shares | Live |
| ART UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| Unison Industrial Development Limited | Private company limited by shares | Live |
| SI KA UNION INVESTMENT LIMITED | Private company limited by shares | Live |
| JOINT UNION ENGINEERING LIMITED | Private company limited by shares | Live |
| TRUMP UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION PROFIT INTERNATIONAL GROUP LIMITED | Private company limited by shares | Live |
| ROYAL UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| CHINA LOVE UNION INT'L GROUP LIMITED | Private company limited by shares | Live |
| TOP UNION INTERNATIONAL ENTERPRISE LIMITED | Private company limited by shares | Live |
| CYBER UNIVERSAL COMPANY LIMITED | Private company limited by shares | Live |
| H.K WANHE INT'L BUSINESS UNION LIMITED | Private company limited by shares | Live |
| SKY UNION INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL FOR MODERN LIGHTING AND ELECTRONICS LIMITED | Private company limited by shares | Live |
| ADG UNION TECHNOLOGY LIMITED | Private company limited by shares | Live |
| UNION PEACE INTERNATIONAL GROUP LIMITED | Private company limited by shares | Dissolved |
| UNION JOY INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNION SUM INTERNATIONAL ELECTRIC CO., LIMITED | Private company limited by shares | Dissolved |
| ELITE UNION TRADING LIMITED | Private company limited by shares | Dissolved |
| UMUDIOKA UNITED CO., LIMITED | Private company limited by shares | Dissolved |
| WISDOM UNION DEVELOPMENT LIMITED | Private company limited by shares | Live |
| UNITED AMPLE LIMITED | Private company limited by shares | Dissolved |
| UNITED PLANNER LIMITED | Private company limited by shares | Dissolved |
| UNION TARGET LIMITED | Private company limited by shares | Live |
| UNITED CENTURY LIMITED | Private company limited by shares | Live |
| PRETTY UNION TRADING LIMITED | Private company limited by shares | Live |
| UNION GLOBE LIMITED | Private company limited by shares | Dissolved |
| UNISOURCE HOLDINGS LIMITED | Private company limited by shares | Live |
| GREAT UNION HOLDINGS LIMITED | Private company limited by shares | Live |
| EASTERN UNITED TECHNOLOGY LIMITED | Private company limited by shares | Live |
| UNION SPEED TRADING LIMITED | Private company limited by shares | Dissolved |
| MIA & EIS Union CO., Limited | Private company limited by shares | Live |
| UNIWAY INTERNATIONAL TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| Union ComSec Applications Limited | Private company limited by shares | Dissolved |
| UNION ENERGY INTERNATIONAL LIMITED | Private company limited by shares | Live |
| NICE UNIVERSE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| UNIONFIELD TECH HK LIMITED | Private company limited by shares | Dissolved |
| UNITED WAY CREATION LIMITED | Private company limited by shares | Dissolved |
| EVER UNION TECHNOLOGY DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| BEST TIME UNION CO., LIMITED | Private company limited by shares | Dissolved |
| UNISOURCE WORLDWIDE LIMITED | Private company limited by shares | Live |
| CHARM UNION DEVELOPMENT LIMITED | Private company limited by shares | Live |
| BEST UNION INTERNATIONAL ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| UNITRANS LOGISTICS LIMITED | Private company limited by shares | Live |
| SUNSHINE UNION SCIENCE GROUP LIMITED | Private company limited by shares | Live |
| SPLENDID UNION INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| UNION GAIN INTERNATIONAL INVESTMENT (HK) LIMITED | Private company limited by shares | Live |
| UNISOM ENTERPRISES CO., LIMITED | Private company limited by shares | Live |
| GUANGDONG UNION TECHNOLOGY CO., LIMITED | Private company limited by shares | Dissolved |
| FRIEND UNION INTERNATIONAL INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNISOURCE (ASIA) LIMITED | Private company limited by shares | Live |
| HARBOUR UNION ENGINEERING LIMITED | Private company limited by shares | Live |
| UNITED (2009) LIMITED | Private company limited by shares | Dissolved |