| POWER UNION INVESTMENTS (HK) LIMITED | Private company limited by shares | Live |
| WEST UNION CORPORATION LIMITED | Private company limited by shares | Dissolved |
| UNION MACHINE EQUIPMENT CO., LIMITED | Private company limited by shares | Dissolved |
| CHINA (HK) UNITED ENGINEERING MACHINERY CO., LIMITED | Private company limited by shares | Dissolved |
| UNITED FOUNDER LIMITED | Private company limited by shares | Dissolved |
| UNION RICHEST TRADING LIMITED | Private company limited by shares | Live |
| UNITED FAME TRADING LIMITED | Private company limited by shares | Dissolved |
| UNION-TONE (HK) LIMITED | Private company limited by shares | Live |
| UNIVERSAL DELTA RESOURCES COMPANY LIMITED | Private company limited by shares | Live |
| UNION-TONE CONSULTING LIMITED | Private company limited by shares | Live |
| CHINA UNITED CREDIT COMMUNICATION INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| DISNEY UNITED HOLDING CO., LIMITED | Private company limited by shares | Live |
| UNION INDUSTRIES LIMITED | Private company limited by shares | Live |
| HONG KONG BAPTIST UNIVERSITY INVESTMENT LIMITED | Private company limited by shares | Live |
| Sea Union (HK) Engineering Limited | Private company limited by shares | Live |
| RADIANT UNION (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| MILLENNIUM UNION LIMITED | Private company limited by shares | Live |
| HONGKONG FACTORY UNION GROUP LIMITED | Private company limited by shares | Dissolved |
| UNIPRO CONSULTING LIMITED | Private company limited by shares | Dissolved |
| U.nieek Group Limited | Private company limited by shares | Live |
| UNIVERSAL WIDE-SPREAD LIMITED | Private company limited by shares | Live |
| UNION WIN ENTERPRISE (CHINA) LIMITED | Private company limited by shares | Live |
| UNITED METALS TRADE CORP. LIMITED | Private company limited by shares | Live |
| HongKong Union Electronics Limited | Private company limited by shares | Live |
| D C UNIVERSAL LIMITED | Private company limited by shares | Live |
| UNIVERSAL LIFE LIMITED | Private company limited by shares | Live |
| TARGET UNION TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| HEALTH UNIVERSAL LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL LUCK LIMITED | Private company limited by shares | Live |
| UNI-SUPREME LIMITED | Private company limited by shares | Dissolved |
| GLORY UNION TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| UNION STAR CONTROL LIMITED | Private company limited by shares | Live |
| ON UNION TRADING LIMITED | Private company limited by shares | Live |
| UNIVERSAL LANDSCAPE LIMITED | Private company limited by shares | Dissolved |
| INTERNATIONAL CONFUCIUS COLLEGE UNION LIMITED | Company limited by guarantee | Dissolved |
| UNION INTERNATIONAL GROUP HOLDINGS LIMITED | Private company limited by shares | Live |
| UNION RESOURCES & ENGINEERING (HONGKONG) COMPANY LIMITED | Private company limited by shares | Live |
| UNITED RICH CAPITAL INVESTMENT LIMITED | Private company limited by shares | Live |
| ALLIED UNION WORLDWIDE LIMITED | Private company limited by shares | Live |
| GREAT UNION INTERNATIONAL (HK) LIMITED | Private company limited by shares | Live |
| UNITED ENGINEERS LIMITED | Private company limited by shares | Live |
| UNION RAINBOW INTERNATIONAL LIMITED | Private company limited by shares | Live |
| TOP UNION BUSINESS LIMITED | Private company limited by shares | Live |
| YUE TAI UNION LIMITED | Private company limited by shares | Live |
| UNISON ELECTRONIC LIMITED | Private company limited by shares | Dissolved |
| UNION UNIVERSE CO., LIMITED | Private company limited by shares | Live |
| T.W UNIQUES SPORTS LIMITED | Private company limited by shares | Live |
| UNION WIN INDUSTRIAL (CHINA) LIMITED | Private company limited by shares | Live |
| VALUE UNIVERSAL LIMITED | Private company limited by shares | Live |
| WESTORE UNION MINING INDUSTRY GROUP LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL INDUSTRY GROUP LIMITED | Private company limited by shares | Live |
| CHINA UNIVERSITIES UNION LIMITED | Private company limited by shares | Live |
| LUCKY UNIVERSE HOLDING LIMITED | Private company limited by shares | Live |
| Union Fasteners Limited | Private company limited by shares | Live |
| FULL UNION HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| ADVANCED UNITED TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| WIN UNION ASIA LIMITED | Private company limited by shares | Live |
| BIG UNION INTERNATIONAL DEVELOPMENT LIMITED | Private company limited by shares | Live |
| CHINESE UNION OF EDUCATIONAL RESEARCH LIMITED | Private company limited by shares | Dissolved |
| UNION WELL INTERNATIONAL ENTERPRISE LIMITED | Private company limited by shares | Live |
| ASIAN UNITED LIMITED | Private company limited by shares | Live |
| UNION GLOBE LIMITED | Private company limited by shares | Live |
| UNION CREATIVE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNION TECH CIRCUIT SHARES CO., LIMITED | Private company limited by shares | Live |
| UNION HOPE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| NEW UNITED INVESTMENTS LIMITED | Private company limited by shares | Live |
| EXCEL UNION INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| CORDIAL UNION HOLDINGS (INTERNATIONAL) LIMITED | Private company limited by shares | Live |
| UNIWAY CREDIT LIMITED | Private company limited by shares | Live |
| POLY UNION (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| UNION CITI FINANCE LIMITED | Private company limited by shares | Live |
| UNION TELECOM INTERNATIONAL LIMITED | Private company limited by shares | Live |
| Unitech (HK) Medical Technology Co., Limited | Private company limited by shares | Dissolved |
| UNIPOINT DEVELOPMENT LIMITED | Private company limited by shares | Live |
| Golden Union (H.K.) Investment Limited | Private company limited by shares | Dissolved |
| UNIVERSAL LEATHERWARE (ASIA) LIMITED | Private company limited by shares | Live |
| HK UNION EVERWIN INVEST GROUP LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL GROUP INVESTMENT MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| UNIMED HEALTH CHECK AND MEDICAL DIAGNOSTIC CENTRE LIMITED | Private company limited by shares | Live |
| Universal Elite Investments Limited | Private company limited by shares | Live |
| UNITY FORCE LIMITED | Private company limited by shares | Live |
| UNION MEDICAL ASSOCIATION LIMITED | Private company limited by shares | Live |
| ALL UNION INTERNATIONAL INVESTMENT LIMITED | Private company limited by shares | Live Commenced dormancy on 05-Feb-2016 |
| UNI-NIPPON CO., LIMITED | Private company limited by shares | Live Commenced dormancy on 11-Nov-2011 |
| GENTLEHOOD UNION OF CHINA COMPANY LIMITED | Private company limited by shares | Live |
| UNIONCHINA ELECTRONICS (HK) CO., LIMITED | Private company limited by shares | Dissolved |
| CHINA UNION FINANCE LEASING GROUP LIMITED | Private company limited by shares | Live |
| WELL UNION CONSULTANTS LIMITED | Private company limited by shares | Live |
| GREAT UNION ENTERPRISES LIMITED | Private company limited by shares | Live |
| Uniwell Resources Limited | Private company limited by shares | Live |
| China Automotive Cleaning Union Limited | Private company limited by shares | Live |
| MILI POLI UNIFORMS CO., LIMITED | Private company limited by shares | Live |
| ADVANCE UNION ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| Universal Integration Electronic Limited | Private company limited by shares | Live |
| PRIDE UNIVERSE LIMITED | Private company limited by shares | Live |
| LONG UNIQUE INVESTMENTS LIMITED | Private company limited by shares | Live |
| UNION LINE HOLDINGS LIMITED | Private company limited by shares | Live |
| GAIN UNION TRADING LIMITED | Private company limited by shares | Live |
| UNIVERSAL-UNITE INVESTMENT LIMITED | Private company limited by shares | Live |
| UNIVERSAL-UNITE INTERNATIONAL INVESTMENT LIMITED | Private company limited by shares | Live |