| UNION PLANNER LIMITED | Private company limited by shares | Live |
| GIANT UNION LIMITED | Private company limited by shares | Live |
| UNION WELL TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| UNION TIP-TOP LIMITED | Private company limited by shares | Live |
| EXCEL UNION INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ASIA UNION GROUP LIMITED | Private company limited by shares | Live |
| GREAT UNION ENGINEERING LIMITED | Private company limited by shares | Live |
| UNION FORTUNE ELECTRONICS LIMITED | Private company limited by shares | Dissolved |
| OCEAN UNION GROUP LIMITED | Private company limited by shares | Live |
| MOST UNION DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| UNION COSMETIC CO., LIMITED | Private company limited by shares | Live |
| UNION BEST MARINE (HK) CO., LIMITED | Private company limited by shares | Live |
| HONG KONG UNION NATION HOLDINGS LIMITED | Private company limited by shares | Live |
| M. Y. & UNION (HK) LIMITED | Private company limited by shares | Live |
| UNIONCONN CO., LIMITED | Private company limited by shares | Live |
| SAM UNION ELECTRONICS CO., LIMITED | Private company limited by shares | Dissolved |
| GOLD UNION INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNION BASE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ASIAN UNION DEVELOPMENT LIMITED | Private company limited by shares | Live |
| WORLD UNION HOLDING COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNION RAY INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| OCEAN UNION INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| CHINA WEDDING INDUSTRY UNION GROUP LIMITED | Private company limited by shares | Live |
| UNION TOP INTERNATIONAL TRADING (HK) LIMITED | Private company limited by shares | Dissolved |
| UNION TECHNOLOGY ENGINEERING LIMITED | Private company limited by shares | Live |
| SUPER UNION DIGITAL CO., LIMITED | Private company limited by shares | Live |
| BEL-CHINA UNION TRADING CO., LIMITED | Private company limited by shares | Dissolved |
| POWER UNION INVESTMENTS (HK) LIMITED | Private company limited by shares | Live |
| WEST UNION CORPORATION LIMITED | Private company limited by shares | Dissolved |
| UNION MACHINE EQUIPMENT CO., LIMITED | Private company limited by shares | Dissolved |
| UNION RICHEST TRADING LIMITED | Private company limited by shares | Live |
| UNION-TONE (HK) LIMITED | Private company limited by shares | Live |
| UNION-TONE CONSULTING LIMITED | Private company limited by shares | Live |
| UNION INDUSTRIES LIMITED | Private company limited by shares | Live |
| Sea Union (HK) Engineering Limited | Private company limited by shares | Live |
| RADIANT UNION (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| MILLENNIUM UNION LIMITED | Private company limited by shares | Live |
| HONGKONG FACTORY UNION GROUP LIMITED | Private company limited by shares | Dissolved |
| UNION WIN ENTERPRISE (CHINA) LIMITED | Private company limited by shares | Live |
| HongKong Union Electronics Limited | Private company limited by shares | Live |
| TARGET UNION TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| GLORY UNION TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| UNION STAR CONTROL LIMITED | Private company limited by shares | Live |
| ON UNION TRADING LIMITED | Private company limited by shares | Live |
| INTERNATIONAL CONFUCIUS COLLEGE UNION LIMITED | Company limited by guarantee | Dissolved |
| UNION INTERNATIONAL GROUP HOLDINGS LIMITED | Private company limited by shares | Live |
| UNION RESOURCES & ENGINEERING (HONGKONG) COMPANY LIMITED | Private company limited by shares | Live |
| ALLIED UNION WORLDWIDE LIMITED | Private company limited by shares | Live |
| GREAT UNION INTERNATIONAL (HK) LIMITED | Private company limited by shares | Live |
| UNION RAINBOW INTERNATIONAL LIMITED | Private company limited by shares | Live |
| TOP UNION BUSINESS LIMITED | Private company limited by shares | Live |
| YUE TAI UNION LIMITED | Private company limited by shares | Live |
| UNION UNIVERSE CO., LIMITED | Private company limited by shares | Live |
| UNION WIN INDUSTRIAL (CHINA) LIMITED | Private company limited by shares | Live |
| WESTORE UNION MINING INDUSTRY GROUP LIMITED | Private company limited by shares | Dissolved |
| Union Fasteners Limited | Private company limited by shares | Live |
| FULL UNION HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| WIN UNION ASIA LIMITED | Private company limited by shares | Live |
| BIG UNION INTERNATIONAL DEVELOPMENT LIMITED | Private company limited by shares | Live |
| CHINESE UNION OF EDUCATIONAL RESEARCH LIMITED | Private company limited by shares | Dissolved |
| UNION WELL INTERNATIONAL ENTERPRISE LIMITED | Private company limited by shares | Live |
| UNION GLOBE LIMITED | Private company limited by shares | Live |
| UNION CREATIVE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| UNION TECH CIRCUIT SHARES CO., LIMITED | Private company limited by shares | Live |
| UNION HOPE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| EXCEL UNION INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| CORDIAL UNION HOLDINGS (INTERNATIONAL) LIMITED | Private company limited by shares | Live |
| POLY UNION (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| UNION CITI FINANCE LIMITED | Private company limited by shares | Live |
| UNION TELECOM INTERNATIONAL LIMITED | Private company limited by shares | Live |
| Golden Union (H.K.) Investment Limited | Private company limited by shares | Dissolved |
| HK UNION EVERWIN INVEST GROUP LIMITED | Private company limited by shares | Dissolved |
| UNION MEDICAL ASSOCIATION LIMITED | Private company limited by shares | Live |
| ALL UNION INTERNATIONAL INVESTMENT LIMITED | Private company limited by shares | Live Commenced dormancy on 05-Feb-2016 |
| GENTLEHOOD UNION OF CHINA COMPANY LIMITED | Private company limited by shares | Live |
| UNIONCHINA ELECTRONICS (HK) CO., LIMITED | Private company limited by shares | Dissolved |
| CHINA UNION FINANCE LEASING GROUP LIMITED | Private company limited by shares | Live |
| WELL UNION CONSULTANTS LIMITED | Private company limited by shares | Live |
| GREAT UNION ENTERPRISES LIMITED | Private company limited by shares | Live |
| China Automotive Cleaning Union Limited | Private company limited by shares | Live |
| ADVANCE UNION ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| UNION LINE HOLDINGS LIMITED | Private company limited by shares | Live |
| GAIN UNION TRADING LIMITED | Private company limited by shares | Live |
| SMART UNION (CHINA) LIMITED | Private company limited by shares | Dissolved |
| UNION AUTO PARTS CO., LIMITED | Private company limited by shares | Live |
| UNION WORLD INVESTMENT CONSULTANCY LIMITED | Private company limited by shares | Live |
| GUANGONG WORLD ASSOCIATION UNION LIMITED | Private company limited by shares | Live |
| VAST UNION (HONG KONG) LIMITED | Private company limited by shares | Live |
| UNION RAFFLES LIMITED | Private company limited by shares | Dissolved |
| UNION NEW STAR LIMITED | Private company limited by shares | Live |
| GOLD UNION INTERNATIONAL LOGISTICS LIMITED | Private company limited by shares | Dissolved |
| China Health Engineering Union Group Limited | Private company limited by shares | Dissolved |
| UNION NEW DEVELOPMENT LIMITED | Private company limited by shares | Live |
| UNION NEW HOLDINGS LIMITED | Private company limited by shares | Live |
| UNION WAY INDUSTRY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| HONG KONG UNION CREATIVE COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONE UNION INTERNATIONAL HOLDING LIMITED | Private company limited by shares | Dissolved |
| UNION BRIGHT DEVELOP LIMITED | Private company limited by shares | Dissolved |
| HK CENTURY UNION HOTEL ENTERTAINMENT MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| CHINA UNION RESOURCES CO., LIMITED | Private company limited by shares | Dissolved |