| University Medical Center Company Limited | Private company limited by shares | Live |
| UNION TEAM CORPORATION LIMITED | Private company limited by shares | Dissolved |
| UNITED NATIONS ASEAN PROCUREMENT AND TRADING CENTRE GROUP LIMITED | Private company limited by shares | Dissolved |
| UNI-BRIGHT JEWELLERY LIMITED | Private company limited by shares | Dissolved |
| J UNIT LIMITED | Private company limited by shares | Live |
| HK UNION TECHNOLOGY LIMITED | Private company limited by shares | Live |
| WIN UNION ENTERPRISES LIMITED | Private company limited by shares | Live |
| UNITED LEADER INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| FAREAST UNITED INVESTMENT GROUP LIMITED | Private company limited by shares | Live |
| UNION GLORY MINING LIMITED | Private company limited by shares | Dissolved |
| UNITED POWER ASIA INVESTMENT LIMITED | Private company limited by shares | Live |
| UNI-POWER (ASIA) LIMITED | Private company limited by shares | Live |
| Universal Prestige Finance Company Limited | Private company limited by shares | Live |
| CROWN UNION INTERNATIONAL TRADING LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Union Energy Group Limited | Private company limited by shares | Dissolved |
| UNION FIELD ENTERPRISES LIMITED | Private company limited by shares | Live |
| UNI-SOFT SYSTEMS (CHINA) LIMITED | Private company limited by shares | Live Commenced dormancy on 08-Dec-2014 |
| UNITED MINERALS CO., LIMITED | Private company limited by shares | Live |
| UNION GLORY (HK) INT'L TRADING LIMITED | Private company limited by shares | Dissolved |
| UNION GLORY MINING EXPLORATION LIMITED | Private company limited by shares | Live |
| GR UNIVERSAL TRADING LIMITED | Private company limited by shares | Live |
| CY UNION HK CO., LIMITED | Private company limited by shares | Dissolved |
| HONGKONG CHINESE UNION GROUP CO., LIMITED | Private company limited by shares | Live |
| SUN UNION INT'L CHRONIC DISEASE MANAGEMENT LIMITED | Private company limited by shares | Live |
| UNION REALTY COMPANY LIMITED | Private company limited by shares | Live |
| UNDERHILL ASSOCIATES LIMITED | Private company limited by shares | Live |
| UNITED SOLAR HOLDING LIMITED | Private company limited by shares | Dissolved |
| SUN UNION BIODEGRADABLE PLASTIC LIMITED | Private company limited by shares | Live |
| UNI-FAITH ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| GLORY UNION GLOBAL LIMITED | Private company limited by shares | Dissolved |
| UNITED ORIENT PRODUCTS LIMITED | Private company limited by shares | Live |
| ACE UNION INVESTMENT LIMITED | Private company limited by shares | Live |
| UNION WELL ASIA GROUP LIMITED | Private company limited by shares | Live |
| BEAUTY UNITED COMPANY LIMITED | Private company limited by shares | Live |
| UNION FINE LUBRICATION TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| MELODY IMAGE INTERNATIONAL UNION CO., LIMITED | Private company limited by shares | Dissolved |
| UNION TREASURE INTERNATIONAL INVESTMENT COMPANY LIMITED | Private company limited by shares | Live |
| WISE UNION CORPORATION LIMITED | Private company limited by shares | Live |
| UNITED CHAMP LIMITED | Private company limited by shares | Live |
| UNLOCK DANCING PLAZA LIMITED | Company limited by guarantee | Live |
| LUCKY UNION INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Universe Creative World (HongKong) Limited | Private company limited by shares | Live |
| UNION INTERNATIONAL GROUP (HK) LIMITED | Private company limited by shares | Live |
| UNI-PROFIT INC. LIMITED | Private company limited by shares | Dissolved |
| UNION KING PACIFIC LIMITED | Private company limited by shares | Live |
| SILVER SUN UNIVERSAL LIMITED | Private company limited by shares | Live |
| BEST UNITED LIMITED | Private company limited by shares | Dissolved |
| THEMIS UNIVERSAL LIMITED | Private company limited by shares | Live |
| UNITED IMPEX COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION LINK INTERNATIONAL INDUSTRIAL LIMITED | Private company limited by shares | Live |
| GLOBAL EDUCATION UNION CULTURE MEDIA LIMITED | Private company limited by shares | Live |
| QUEEN UNION LIMITED | Private company limited by shares | Dissolved |
| UNLIMITED SPACE LIMITED | Private company limited by shares | Live |
| Union Morris Holdings Limited | Private company limited by shares | Live |
| CHINA UNION STEEL HOLDING CO., LIMITED | Private company limited by shares | Dissolved |
| UNION INTERNATIONAL CORPORATION LIMITED | Private company limited by shares | Dissolved |
| KOBO UNIVERSAL TRADING LIMITED | Private company limited by shares | Live |
| SINIC UNION BUSINESS CONSULTANT (HK) LIMITED | Private company limited by shares | Live |
| MEGA UNION HONG KONG DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNITED AGENT LIMITED | Private company limited by shares | Dissolved |
| UNION WELL GROUP HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| MULTI UNION FAR EAST LIMITED | Private company limited by shares | Dissolved |
| SMART UNION ENTERPRISES LIMITED | Private company limited by shares | Live |
| UNITED FAME (CHINA) LIMITED | Private company limited by shares | Dissolved |
| UNLIMITED COMPANY LIMITED | Private company limited by shares | Live |
| Ruixin Universal Limited | Private company limited by shares | Live |
| UNIVERSAL YIELD LIMITED | Private company limited by shares | Live |
| FOCUS MARKET UNION LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL TECH LIMITED | Private company limited by shares | Live |
| LEGEND UNION GRAND PROFIT LIMITED | Private company limited by shares | Dissolved |
| Uni-Cell Investment Limited | Private company limited by shares | Dissolved |
| GALA UNION GRAND PROFIT LIMITED | Private company limited by shares | Dissolved |
| UNION WELL GRAND PROFIT LIMITED | Private company limited by shares | Dissolved |
| UNION BEST GRAND PROFIT LIMITED | Private company limited by shares | Dissolved |
| UNION SUCCESS GRAND PROFIT LIMITED | Private company limited by shares | Dissolved |
| UNION CHOICE GRAND PROFIT LIMITED | Private company limited by shares | Dissolved |
| UNION LINK GRAND PROFIT LIMITED | Private company limited by shares | Dissolved |
| MEGA UNION CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| Unity Assets Company Limited | Private company limited by shares | Live |
| ARK UNION LIMITED | Private company limited by shares | Dissolved |
| AIO UNIVERSE COMPANY LIMITED | Private company limited by shares | Live |
| UNITY TEXTILES (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| EVER UNITED INVESTMENT COMPANY LIMITED | Private company limited by shares | Live |
| UNIVERSAL SHOES LIMITED | Private company limited by shares | Live |
| SUPREME UNION MANAGEMENT LIMITED | Private company limited by shares | Live |
| ABLE UNION TRADING LIMITED | Private company limited by shares | Dissolved |
| TARGET UNION INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNION WORLD INTERNATIONAL SHIPPING LIMITED | Private company limited by shares | Live |
| Cleantech United Investments HK Limited | Private company limited by shares | Dissolved |
| BRIGHT UNION HONG KONG CPA LIMITED | Private company limited by shares | Live |
| UNFREEZE LIMITED | Private company limited by shares | Dissolved |
| UNI-FLAG LIMITED | Private company limited by shares | Live |
| UNIBULK CORP. LIMITED | Private company limited by shares | Live |
| UNLEASHING.MIND LIMITED | Private company limited by shares | Live |
| LUCKY STAR UNIVERSAL LIMITED | Private company limited by shares | Live |
| UNION EXPO LIMITED | Private company limited by shares | Live |
| BRITISH UNION GROUP LIMITED | Private company limited by shares | Live |
| NATION UNION ENTERPRISES LIMITED | Private company limited by shares | Live |
| UNION VISION ENTERPRISE (INTERNATIONAL) LIMITED | Private company limited by shares | Dissolved |
| UNIK HOLDING LIMITED | Private company limited by shares | Live |