| UNION FINE INVESTMENT LIMITED | Private company limited by shares | Live |
| UNIQUE TRADING LIMITED | Private company limited by shares | Dissolved |
| UNIQUE LUCK LIMITED | Private company limited by shares | Dissolved |
| UNION HOPE (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| UNITEK HK LIMITED | Private company limited by shares | Dissolved |
| GREATEN UNION LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL LINK LIMITED | Private company limited by shares | Live |
| SKY UNITED ENTERPRISES LIMITED | Private company limited by shares | Live |
| UN ELDER INDUSTRY UNION LIMITED | Private company limited by shares | Dissolved |
| UNITED ELECTECH LIMITED | Private company limited by shares | Live |
| UNION INTERNATIONAL CAPITAL LIMITED | Private company limited by shares | Dissolved |
| BEST UNION HONG KONG DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| CHINA UNIQUE INVESTMENT LIMITED | Private company limited by shares | Live |
| UNION FAMOUS ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| UNION VAST LIMITED | Private company limited by shares | Dissolved |
| UNION WIN DEVELOP LIMITED | Private company limited by shares | Dissolved |
| DOUBLE UNION LIMITED | Private company limited by shares | Dissolved |
| LAROPA UNION LIMITED | Private company limited by shares | Dissolved |
| RICH UNION HONG KONG INVESTMENT LIMITED | Private company limited by shares | Live |
| UNI-SUCCESS CONSTRUCTION ENGINEERING LIMITED | Private company limited by shares | Live |
| CHINA INTERNATIONAL GROUP UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| EVER UNIVERSE SYSTEM ENGINEERING (BHM) LIMITED | Private company limited by shares | Live |
| CHINA UNITED CONSTRUCTION INVESTMENT GROUP HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| Unity Productions Limited | Private company limited by shares | Live |
| UNION CENTURY TECH (HK) CO., LIMITED | Private company limited by shares | Live |
| UNIQIDS LIMITED | Private company limited by shares | Dissolved |
| UNIVERSE (CHINA) LIMITED | Private company limited by shares | Live |
| SOURCE UNION LIMITED | Private company limited by shares | Live |
| UNI-SPEED LIMITED | Private company limited by shares | Live |
| UNION OLYMPIC LIMITED | Private company limited by shares | Live |
| XINKENDU UNION LIMITED | Private company limited by shares | Dissolved |
| Unity Entertainment Limited | Private company limited by shares | Live |
| MLC United Limited | Private company limited by shares | Live |
| UNCIL BEAUTE LIMITED | Private company limited by shares | Live |
| BEST UNION INVESTMENT (HONG KONG) LIMITED | Private company limited by shares | Live |
| NEW UNION HOME PRODUCTS COMPANY LIMITED | Private company limited by shares | Live |
| UNION CRYSTAL LIMITED | Private company limited by shares | Live |
| SKY UNION LIMITED | Private company limited by shares | Live |
| UNITED NICE LIMITED | Private company limited by shares | Dissolved |
| UNION LIGHT HOLDING (HONGKONG) LIMITED | Private company limited by shares | Dissolved |
| ASIA UNIQUE LIMITED | Private company limited by shares | Dissolved |
| UNION HOPE INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| MAGNIFICENT UNION (HONG KONG) LIMITED | Private company limited by shares | Live |
| UNION ASIA RESOURCES LIMITED | Private company limited by shares | Live |
| UNIVERSE BOOKS AGENCY LIMITED | Private company limited by shares | Live |
| NEW UNION (ASIA) LIMITED | Private company limited by shares | Dissolved |
| JET UNION GROUP HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| UNPUBLISHABLE LIMITED | Private company limited by shares | Dissolved |
| UNION SUCCESS DEVELOP LIMITED | Private company limited by shares | Dissolved |
| UNI-SUMMIT LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL TESTING AND RESEARCH COMPANY LIMITED | Private company limited by shares | Live |
| UNION (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| SINO EURO UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| OCEAN UNION INVESTMENT DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNICHOICE ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| UNION PROFIT DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION FIELD INTERNATIONAL DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION GLORY SHIP COMPANY LIMITED | Private company limited by shares | Dissolved |
| SUN VISION UNDERWRITERS LIMITED | Private company limited by shares | Live |
| UNION HOPESON (INTERNATIONAL) INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| HONG KONG ASSOCIATION OF PEACE UNION LIMITED | Company limited by guarantee | Live |
| UNION TRADE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| TECH UNION INDUSTRIAL LIMITED | Private company limited by shares | Live |
| RANK UNION INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| United Aluminum Asia Limited | Private company limited by shares | Dissolved |
| United Fosa Hotel & Resort International Management Co., Limited | Private company limited by shares | Live |
| MEGA UNION CONSTRUCTION ENGINEERING LIMITED | Private company limited by shares | Live |
| HONGKONG HUAYU UNION CO., LIMITED | Private company limited by shares | Dissolved |
| HUNDRED UNION INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| EASE UNION LIMITED | Private company limited by shares | Dissolved |
| UNION WORLD PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| UNITED WEALTH CREATION LIMITED | Private company limited by shares | Live |
| UNION STRONG CORPORATION LIMITED | Private company limited by shares | Dissolved |
| POLY UNITED LIMITED | Private company limited by shares | Live |
| UNITED CRUISE LIMITED | Private company limited by shares | Dissolved |
| ONE UNION LIMITED | Private company limited by shares | Dissolved |
| UNION CONCEPT INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| LUCKY UNION INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION FORCE CARGO SERVICE LIMITED | Private company limited by shares | Live |
| UNION TRADE CREATION LIMITED | Private company limited by shares | Live |
| UNI-SUCCESS MANAGEMENT LIMITED | Private company limited by shares | Live |
| UNIQUEGET TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| NINGBO UNITED MARINE MACHINERY LIMITED | Private company limited by shares | Dissolved |
| UNITED BUSINESS SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| FORTUNE UNION CHANNEL LIMITED | Private company limited by shares | Dissolved |
| PRECIOUS UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| TOP UNION (ASIA) COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNISON GARMENT LIMITED | Private company limited by shares | Live |
| RESOURCE UNLIMITED LIMITED | Private company limited by shares | Live |
| UNION WORLD ELECTRONICS LIMITED | Private company limited by shares | Live |
| CHINA ART UNION LIMITED | Private company limited by shares | Live |
| UNION INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| HONG KONG UNIONINVEST GROUP LIMITED | Private company limited by shares | Dissolved |
| SW UNION INVESTMENT SERVICE LIMITED | Private company limited by shares | Live |
| UNIVERSITY TALENT MANAGEMENT LIMITED | Private company limited by shares | Live |
| RISE UNION GLOBAL LIMITED | Private company limited by shares | Dissolved |
| MING UNITED INVESTMENT LIMITED | Private company limited by shares | Live |
| STAR UNIVERSE GROUP LIMITED | Private company limited by shares | Dissolved |
| UNION (KOWLOON) ENGINEERING LIMITED | Private company limited by shares | Live |
| HEADSPRING UNION TARGET TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |