| UNION BASE DEVELOPMENT LIMITED | Private company limited by shares | Live |
| UNION FIREWORK ASSOCIATION LIMITED | Company limited by guarantee | Live |
| 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 |
| UNION RISE COMPANY LIMITED | Private company limited by shares | Live |
| UNION FAITH ENERGY (HK) LIMITED | Private company limited by shares | Live |
| 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 |
| 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 |
| UNION LIGHT INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| PURE UNION LIMITED | Private company limited by shares | Dissolved |
| LONG UNION INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| COIN UNION LIMITED | Private company limited by shares | Dissolved |
| UNION MARK INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNION GATE COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION CHANCE COMPANY LIMITED | Private company limited by shares | Dissolved |
| FU SHAN AND KING SHAN TAICHE STUDENT UNION LIMITED | Company limited by guarantee | Dissolved |
| UNION HONEST INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| WIN UNION INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| BIG UNION MOTORS LIMITED | Private company limited by shares | Live |
| Global Union Transportation Limited | Private company limited by shares | Live |
| UNION PRECISION TOOLS MACHINERY LIMITED | Private company limited by shares | Dissolved |
| GROUP UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| HEART UNION TAXI ASSOCIATION LIMITED | Company limited by guarantee | Dissolved |
| UNION POINT SERVICES LIMITED | Private company limited by shares | Dissolved |
| UNION SKY LIMITED | Private company limited by shares | Dissolved |
| SOON UNION LIMITED | Private company limited by shares | Dissolved |
| UNION MANOR INVESTMENT LIMITED | Private company limited by shares | Live |
| GROW UNION INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| SOLAR UNION INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNION TEAM LIMITED | Private company limited by shares | Live |
| UNION SQUARE LIMITED | Private company limited by shares | Live |
| UNIONPORT COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION FAIR ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| HONG KONG WUSHU UNION LIMITED | Company limited by guarantee | Live |
| FINE UNION LIMITED | Private company limited by shares | Live |
| UNIONMATE LIMITED | Private company limited by shares | Live |
| UNI-ORIENT LIMITED | Private company limited by shares | Dissolved |
| JOY UNION ESTATE LIMITED | Private company limited by shares | Live |
| UNION TECH DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| A-TEX UNION UNDER-FASHION FACTORY LIMITED | Private company limited by shares | Dissolved |
| BUILD UNION COMPANY LIMITED | Private company limited by shares | Dissolved |
| JOINT UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SOFT UNION LIMITED | Private company limited by shares | Dissolved |
| UNION MOTION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SOON UNION PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| LAND UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNION TRIP LIMITED | Private company limited by shares | Dissolved |
| UNION PACKO LIMITED | Private company limited by shares | Dissolved |
| UNION ZONE LIMITED | Private company limited by shares | Live |
| RAINBOW UNION LIMITED | Private company limited by shares | Dissolved |
| UNION REGISTRARS LIMITED | Private company limited by shares | Live |
| UNION FORCE INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION GOOD INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION HEART INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION TEAM INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION VIEW INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION YIELD INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION GATE INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| UNION HEALTH PRODUCTS LIMITED | Private company limited by shares | Live |
| UNION STAR INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| WIDE UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| KIND UNION DEVELOPMENT LIMITED | Private company limited by shares | Live |
| SUPER UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| KING UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION RADIO SERVICES TRANSPORTATION COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION KEY LIMITED | Private company limited by shares | Live |
| CHARM UNION LIMITED | Private company limited by shares | Dissolved |
| UNION HONOUR INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| FOREVER UNION DEVELOPMENT LIMITED | Private company limited by shares | Live |
| UNION PROPERTY LIMITED | Private company limited by shares | Dissolved |
| UNION WORTH INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ASIATIC UNION INDUSTRIES LIMITED | Private company limited by shares | Live |
| UNION CHAMP LIMITED | Private company limited by shares | Live |
| UNIONGRADE INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION PARTS COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION OFFICES LIMITED | Private company limited by shares | Dissolved |
| UNION WISE INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| UNION FOND INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION WORTH LIMITED | Private company limited by shares | Dissolved |
| UNIONINN LIMITED | Private company limited by shares | Dissolved |
| STANDED UNION INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| UNION WAY DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION HOPE DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION ERA COMPANY LIMITED | Private company limited by shares | Live |
| UNION WAY ENGINEERING CO. LIMITED | Private company limited by shares | Dissolved |
| JOIN UNION COMMERCIAL FINANCE LIMITED | Private company limited by shares | Dissolved |
| JOIN UNION FRUITS & PROVISION COMPANY LIMITED | Private company limited by shares | Dissolved |
| JOIN UNION MARKETING SERVICES LIMITED | Private company limited by shares | Dissolved |
| JOIN UNION REAL ESTATE AGENCY LIMITED | Private company limited by shares | Dissolved |
| UNION POINT INSURANCE SERVICES & INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| MASTER UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| UNION WELL DEVELOPMENT LIMITED | Private company limited by shares | Live |