| UNION ENERGY SOURCES ENGINEERING TECHNOLOGY LIMITED | Private company limited by shares | Live |
| FORT UNION LIMITED | Private company limited by shares | Live |
| UNIVERSE MICRO TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| UNITEINTEREST (FRANCE) CO., LIMITED | Private company limited by shares | Dissolved |
| SINO UNION HONG KONG INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNIQUEST COMPANY LIMITED | Private company limited by shares | Dissolved |
| GAINFUL UNIVERSAL LIMITED | Private company limited by shares | Live |
| CHINA INTERNATIONAL WINE INDUSTRY UNION LIMITED | Private company limited by shares | Dissolved |
| UNIPAC (ASIA) LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL UNION INCORPORATION LIMITED | Private company limited by shares | Dissolved |
| STAR UNION SKYKEE INTERNATIONAL MEDIA LIMITED | Private company limited by shares | Live |
| UNION MOMENTUM (HONG KONG) INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNISON HOLDINGS LIMITED | Private company limited by shares | Live |
| MAIN UNION (H.K.) LIMITED | Private company limited by shares | Live |
| UNION LINKS HONG KONG COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIWAY INTERNATIONAL INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNIQUE GRAND LIMITED | Private company limited by shares | Live |
| UNION PERFECT LIMITED | Private company limited by shares | Live |
| UNION TREASURE LIMITED | Private company limited by shares | Dissolved |
| UNITED VISION LIMITED | Private company limited by shares | Live |
| UNIVERSAL GLOBAL LIMITED | Private company limited by shares | Live |
| RICH UNIVERSAL LIMITED | Private company limited by shares | Dissolved |
| Union Electric Steel (Hong Kong) Limited | Private company limited by shares | Live |
| GOLD UNIQUE LIMITED | Private company limited by shares | Live |
| Unique Voices Publishing Limited | Company limited by guarantee | Live |
| CK UNISTEEL LIMITED | Private company limited by shares | Dissolved |
| UNION GOOD ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| GLOBAL UNION HOLDINGS LIMITED | Private company limited by shares | Live |
| EASE UNION INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNIXTRONICS LIMITED | Private company limited by shares | Live |
| Xinmei Union Hong Kong Limited | Private company limited by shares | Dissolved |
| UNION PROPERTIES LIMITED | Private company limited by shares | Live |
| United Agencies Limited | Private company limited by shares | Dissolved |
| UNION HOPE LIMITED | Private company limited by shares | Live Commenced dormancy on 25-Apr-2014 |
| PROGRESS UNION LIMITED | Private company limited by shares | Live |
| HK DAYANG UNITED INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| STRONG UNION GROUP LIMITED | Private company limited by shares | Live |
| EXCELLENT UNITY LIMITED | Private company limited by shares | Live |
| UNION HONG KONG INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| HESTIA UNIVERSAL COMPANY LIMITED | Private company limited by shares | Live |
| BIG UNION LIMITED | Private company limited by shares | Live |
| JOY UNION DEVELOPMENT LIMITED | Private company limited by shares | Live |
| CHINA UNITED ACADEMY OF PETROLEUM SCIENCES CO., LIMITED | Private company limited by shares | Live |
| UNITED SHIPPING & ENTERPRISES LIMITED | Private company limited by shares | Live |
| SINO UNION WORLDWIDE LIMITED | Private company limited by shares | Dissolved |
| BEST UNION INVESTMENT DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION STAR INTERNATIONAL HOLDINGS LIMITED | Private company limited by shares | Live |
| UNION OCEAN INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| NEW UNION INTERNATIONAL INVESTMENTS LIMITED | Private company limited by shares | Live |
| CHINA STARS UNIVERSAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNITED WELFARE UNION HONG KONG LIMITED | Company limited by guarantee | Live |
| MODERN UNION LIMITED | Private company limited by shares | Dissolved |
| FIRST UNION DEVELOPMENT LIMITED | Private company limited by shares | Live |
| UNION VICTOR INVESTMENT LIMITED | Private company limited by shares | Live |
| UNICRAFT HK CO., LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL RESOURCES (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| LINK UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNI-GAIN ASIA PACIFIC LIMITED | Private company limited by shares | Dissolved |
| UNION WELL ENTERPRISE LIMITED | Private company limited by shares | Live |
| UNION FIELD (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| POWER UNION LIMITED | Private company limited by shares | Live |
| UNIMARK ENGINEERING (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| UNITECH INTERNATIONAL TRADE CO., LIMITED | Private company limited by shares | Live |
| UNICORP INVESTMENT LIMITED | Private company limited by shares | Live |
| UNION PARK GROUP LIMITED | Private company limited by shares | Dissolved |
| PEACEFUL UNIVERSE LIMITED | Private company limited by shares | Live |
| UNION RISING (HONG KONG) LIMITED | Private company limited by shares | Live |
| JET UNITED INVESTMENT LIMITED | Private company limited by shares | Live |
| UNION PATH ENTERPRISES LIMITED | Private company limited by shares | Live |
| UNION PATH DEVELOPMENT LIMITED | Private company limited by shares | Live |
| GOLD UNIVERSE TRADING LIMITED | Private company limited by shares | Dissolved |
| UNION FORTUNE INTERNATIONAL TRADING GROUP LIMITED | Private company limited by shares | Dissolved |
| UNION STEEL RESOURCES CO., LIMITED | Private company limited by shares | Dissolved |
| NEW UNITECH (HK) ELECTRONICS LIMITED | Private company limited by shares | Live |
| SUN UNION RIVER COMPANY LIMITED | Private company limited by shares | Live |
| 3N UNION CO., LIMITED | Private company limited by shares | Dissolved |
| MODERN UNION INTERNATIONAL LIMITED | Private company limited by shares | Live |
| Team Union Limited | Private company limited by shares | Live |
| UNION RICH ASIA PACIFIC LIMITED | Private company limited by shares | Live |
| ALSTON UNIVERSAL LIMITED | Private company limited by shares | Live |
| PROGRESS UNION HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| Holy Wisdom United Petroleum International Co., Limited | Private company limited by shares | Dissolved |
| UNI-CAPITAL INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ORIENTAL UNION HOLDINGS DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNITED MERIT LIMITED | Private company limited by shares | Live |
| UNITECH TECHNOLOGIES (HK) CO., LIMITED | Private company limited by shares | Dissolved |
| UNITED UNIVERSE SHOES LIMITED | Private company limited by shares | Dissolved |
| G.M.L UNION ENTERPRISE LIMITED | Private company limited by shares | Live |
| SHANGHAI CHINA UNION FUN EQUIPMENT CO., LIMITED | Private company limited by shares | Live |
| KIN WING UNITED TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIQUE INVESTMENT (GROUP) LIMITED | Private company limited by shares | Dissolved |
| LITIAN UNIVERSAL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNION NATURAL HOLDINGS LIMITED | Private company limited by shares | Live |
| Empire Union (ASIA) Limited | Private company limited by shares | Dissolved |
| UNIVERSAL CONNECTER LIMITED | Private company limited by shares | Live |
| UNION CORPORATION (HONG KONG) LIMITED | Private company limited by shares | Live |
| UNION ROCK LIMITED | Private company limited by shares | Dissolved |
| UNI-MOULDING CO., LIMITED | Private company limited by shares | Live |
| FINE UNION INTERNATIONAL DEVELOPMENT LIMITED | Private company limited by shares | Live Commenced dormancy on 02-Jun-2009 |
| UNITED RIVER INVESTMENTS LIMITED | Private company limited by shares | Live |