| UNION LIGHT LIMITED | Private company limited by shares | Dissolved |
| WAH TAI UNION ENGINEERING & TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNICONTINENTAL LIMITED | Private company limited by shares | Live |
| INTER-STATES UNDERWRITING AGENTS LIMITED | Private company limited by shares | Live |
| UNIVERSAL FOOTWEAR COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNI-CROWN INVESTMENT LIMITED | Private company limited by shares | Live |
| UNITON TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| UNIFLOW INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION SHEEN INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| GRANT UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNILINK INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNITED FURNITURE COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNITE ARRANGE LIMITED | Private company limited by shares | Dissolved |
| UNITED CENTURY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNIQUE TOYS AND PRODUCTS LIMITED | Private company limited by shares | Dissolved |
| UNION SPARK DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL SPORTS LIMITED | Private company limited by shares | Live |
| CLOVER UNION LIMITED | Private company limited by shares | Dissolved |
| UNION_C BUSINESS SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIGONE COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION PROFIT LIMITED | Private company limited by shares | Dissolved |
| SLB Bearings and Mounted Units Limited | Private company limited by shares | Live |
| CHINESE UNION MISSION OF SEVENTH-DAY ADVENTISTS LIMITED | Company limited by guarantee | Live |
| UNIVERSITY HALL ALUMNI LIMITED | Company limited by guarantee | Live |
| UNION WORKSHOP LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL ROOTS LIMITED | Private company limited by shares | Dissolved |
| GREATMERGE UNIVERSAL LIMITED | Private company limited by shares | Dissolved |
| MINTOTOR UNIVERSAL LIMITED | Private company limited by shares | Live |
| UNITY ALUMINIUM COMPANY LIMITED | Private company limited by shares | Dissolved |
| UENO UNIKA INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| UNION TRUTH LIMITED | Private company limited by shares | Dissolved |
| UNION STEP DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNILY LIMITED | Private company limited by shares | Dissolved |
| UNITED STANDARD LIMITED | Private company limited by shares | Live |
| ALL UNION GARMENT MANUFACTURER CO., LIMITED | Private company limited by shares | Dissolved |
| UNION REAL ESTATE COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION LANE INTERNATIONAL DEVELOPMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION FAITH TRANSPORTATION LIMITED | Private company limited by shares | Dissolved |
| UNIPOST LIMITED | Private company limited by shares | Dissolved |
| UNION CIRCLE COMPANY LIMITED | Private company limited by shares | Dissolved |
| WIN UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNITED MARK INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNION YORK INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNITED 90 HOT POT RESTAURANT LIMITED | Private company limited by shares | Dissolved |
| FRESH UNION INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNI-LEADER INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| UNI-LEADER TEXTILES LIMITED | Private company limited by shares | Dissolved |
| UNI-SEAFOODS COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIFORD COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNI-VOTE LIMITED | Private company limited by shares | Dissolved |
| UNION PEACE DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| MULTI UNION TRADING COMPANY LIMITED | Private company limited by shares | Live |
| UNIGLAD LIMITED | Private company limited by shares | Dissolved |
| UNION BALL INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNIEASE INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| GRAND UNION INDUSTRIES LIMITED | Private company limited by shares | Live |
| UNIPIPE AND EQUIPMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION FAST LIMITED | Private company limited by shares | Dissolved |
| UNICHAMP CANWAY LIMITED | Private company limited by shares | Dissolved |
| UNION YARD LIMITED | Private company limited by shares | Dissolved |
| UNION ASIA DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNI-CHALLENGE LIMITED | Private company limited by shares | Dissolved |
| UNITAK TECHNOLOGY (HONG KONG) INDUSTRIAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION LANE CONCEPTS PRODUCTIONS LIMITED | Private company limited by shares | Dissolved |
| UNION HEART TRADING LIMITED | Private company limited by shares | Dissolved |
| UNIFIED CHEER COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIFIED CHOICE COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL HIGHER EDUCATIONAL INSTITUTIONS LIMITED | Private company limited by shares | Dissolved |
| FIRST UNION (WATCH) COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION TALENT INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| GREAT UNION LINNA (FAR EAST) LIMITED -THE- | Private company limited by shares | Dissolved |
| HUGH UNITY INDUSTRIAL LIMITED | Private company limited by shares | Live |
| UNIQUE CLIFF INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNI-VICTORY INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION GRADE LIMITED | Private company limited by shares | Live |
| UNION SHINE INDUSTRIAL LIMITED | Private company limited by shares | Live |
| UNION CRYSTAL INDUSTRIAL LIMITED | Private company limited by shares | Live |
| SUN'S UNION WATCH MANUFACTURER LIMITED | Private company limited by shares | Live |
| SET UNION INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| SET UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION FAITH SUPPLIES LIMITED | Private company limited by shares | Live |
| UNION CHEER COMPUTER LIMITED | Private company limited by shares | Dissolved |
| UNION GOOD TRADING LIMITED | Private company limited by shares | Dissolved |
| UNITREND TRADING LIMITED | Private company limited by shares | Dissolved |
| U P I UNITED PACIFIC INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNIONTELE INVESTMENTS LIMITED | Private company limited by shares | Live |
| UNIONAM TRADING LIMITED | Private company limited by shares | Dissolved |
| AQUILA UNIVERSAL DEVELOPMENTS CO., LIMITED | Private company limited by shares | Live |
| HUGH UNION INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| HUGH UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNISON DIAZO SUPPLIES COMPANY LIMITED | Private company limited by shares | Live |
| HUGH UNION (INTERNATIONAL) LIMITED | Private company limited by shares | Dissolved |
| UNICON INTERNATIONAL (H.K.) LIMITED | Private company limited by shares | Dissolved |
| UNION TAILOR LIMITED | Private company limited by shares | Live |
| UNION PERFECT INVESTMENT LIMITED | Private company limited by shares | Live |
| UNITSKY INVESTMENT LIMITED | Private company limited by shares | Live |
| UNION WORD LIMITED | Private company limited by shares | Dissolved |
| UNION CROWD LIMITED | Private company limited by shares | Dissolved |
| UNION CROWD INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION GLORY INSURANCE (AGENTS) LIMITED | Private company limited by shares | Dissolved |