| UNION SILK FLOWERS MANUFACTORY LIMITED | Private company limited by shares | Live |
| UNION FORCE DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNIONHORN COMPANY LIMITED | Private company limited by shares | Dissolved |
| CAPITAL UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION CENTRE INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNI-JOINTS LIMITED | Private company limited by shares | Dissolved |
| UNITART LIMITED | Private company limited by shares | Dissolved |
| UNITBEST LIMITED | Private company limited by shares | Live |
| PASS UNION COMPANY LIMITED | Private company limited by shares | Dissolved |
| GIANT EAGLE UNION COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION BOCUBE UNDERWEAR MANUFACTURING LIMITED | Private company limited by shares | Live |
| UNIVERSAL-VEST COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIQUE GAIN TRADING LIMITED | Private company limited by shares | Dissolved |
| UNION STRONG GROUP LIMITED | Private company limited by shares | Live |
| UNITED PEAK LIMITED | Private company limited by shares | Live |
| PAUL UNION LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL BASE COMPANY LIMITED | Private company limited by shares | Dissolved |
| GOOD UNION INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| UNITEDAY TRADING LIMITED | Private company limited by shares | Dissolved |
| UNISILK LIMITED | Private company limited by shares | Live |
| UNITED-CHINA AIR CARGO LIMITED | Private company limited by shares | Dissolved |
| UNITY LASER LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL PLAN LIMITED | Private company limited by shares | Dissolved |
| SKY UNION SERVICES LIMITED | Private company limited by shares | Dissolved |
| UNIQUE TECHNOLOGY (ASIA) LIMITED | Private company limited by shares | Dissolved |
| HONG KONG UNDERWATER TOURIST LIMITED | Private company limited by shares | Dissolved |
| UNION AUTOMATION ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIGAIN INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SUM FUNG UNION LIMITED | Private company limited by shares | Dissolved |
| UNITED ENTERTAINMENT LIMITED | Private company limited by shares | Live |
| UNION PROFIT INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| UNISMART INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNION FULL COMPANY LIMITED | Private company limited by shares | Dissolved |
| P & C UNION GARMENT FACTORY LIMITED | Private company limited by shares | Dissolved |
| MAY YORK UNITED LIMITED | Private company limited by shares | Live |
| UNION FORTUNE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| GOLD UNION KNITTERS LIMITED | Private company limited by shares | Dissolved |
| HONG KONG UNITED ALUMNI ASSOCIATION OF TAIWAN UNIVERSITIES LIMITED | Company limited by guarantee | Live |
| UNION TIME COMPANY LIMITED | Private company limited by shares | Live |
| UNION VICTORY INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNICOPIA COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONE UNIVERSE LIMITED | Private company limited by shares | Dissolved |
| TRUE UNION COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION C & E LIMITED | Private company limited by shares | Live |
| UNIWELL INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL FAIR LIMITED | Private company limited by shares | Live |
| UNIVERSAL EMA LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL WAY LIMITED | Private company limited by shares | Live |
| UNIVERSAL TARGET LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL SPEED LIMITED | Private company limited by shares | Dissolved |
| YANGTZEJIANG UNION CONSULTANCY COMPANY LIMITED | Private company limited by shares | Live |
| UNISPACE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNIVERSE LASER & VIDEO CO. LIMITED | Private company limited by shares | Live |
| KONG UNION LIMITED | Private company limited by shares | Dissolved |
| UNICOSMOS REALTY & INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| GLORY UNION IMITATION JEWELLERY LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL CURE LIMITED | Private company limited by shares | Dissolved |
| PRODUCTS UNION GARMENTS LIMITED | Private company limited by shares | Dissolved |
| UNIWIDE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNITREASURE LIMITED | Private company limited by shares | Dissolved |
| UNITED SOCIAL SERVICE CENTRE LIMITED | Company limited by guarantee | Live |
| UNIAUST COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION LINE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNISON CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| UNITED MACHINING WORKS, LIMITED | Private company limited by shares | Dissolved |
| UNIVERSITY OF LONDON GRADUATES ASSOCIATION LIMITED | Company limited by guarantee | Dissolved |
| GREAT UNION INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| UNITED KESVICK LIMITED | Private company limited by shares | Live |
| UNIOCEAN LIMITED | Private company limited by shares | Dissolved |
| UNION RICH INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNION MARK DEVELOPMENT LIMITED | Private company limited by shares | Live |
| UNISON DESIGN & CONTRACT COMPANY LIMITED | Private company limited by shares | Dissolved |
| BEST UNION TEXTILE COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION LASER ALARM COMPANY LIMITED | Private company limited by shares | Live |
| UNION BASE DEVELOPMENT LIMITED | Private company limited by shares | Live |
| UNION FIREWORK ASSOCIATION LIMITED | Company limited by guarantee | Live |
| UNIFLY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| JOYFUL UNION COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION RESOURCES (EDUCATIONAL DEVELOPMENT) LIMITED | Private company limited by shares | Live |
| WISE UNION PROFESSIONAL HOUSING MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL BRIGHT LIMITED | Private company limited by shares | Dissolved |
| UNITED STANDARD LIMITED | Private company limited by shares | Dissolved |
| UNI-RAY LIMITED | Private company limited by shares | Dissolved |
| UNITED HILL COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNITED TARGET LIMITED | Private company limited by shares | Dissolved |
| UNION RISE COMPANY LIMITED | Private company limited by shares | Live |
| UNION FAITH ENERGY (HK) LIMITED | Private company limited by shares | Live |
| UNITRANS CONSOLIDATED COMPANY LIMITED | Private company limited by shares | Dissolved |
| GOLD UNION FINANCE LIMITED | Private company limited by shares | Dissolved |
| EASY UNION COMPANY LIMITED | Private company limited by shares | Live |
| GREAT & NEW UNION COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION OCEAN COMPANY LIMITED | Private company limited by shares | Dissolved |
| FAIR UNION INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| LONG UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNIQUE CREATION LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL WOOD LIMITED | Private company limited by shares | Dissolved |
| UNION FIT COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIONSTEAD LIMITED | Private company limited by shares | Dissolved |
| GREAT UNION LINNA (H.K.) LIMITED -THE- | Private company limited by shares | Dissolved |