| QUANTUM INTERNATIONAL (USA) OIL PRODUCTS LIMITED | Private company limited by shares | Live |
| QUANTUM RESOURCES INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ICE QUANTUM SMART INTERNATIONAL LIMITED | | Live |
| QUANTUM SUNGAM INTERNATIONAL HOLDINGS LIMITED | Private company limited by shares | Live |
| Quantum Technology International Limited | Private company limited by shares | Live |
| QUANTUM TECHNOLOGY INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| BAO SENG NEW QUANTUM AND TECHNOLOGY INTERNATIONAL HOLDING LIMITED | Private company limited by shares | Live |
| QUANTUM TRADE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| QUANTUM INTERNATIONAL TRADING LIMITED | Private company limited by shares | Dissolved |
| QUANTUM INTERNATIONAL TRADING LIMITED | Private company limited by shares | Dissolved |
| QuanTum Assets (International) Trading Center Limited | Private company limited by shares | Live |
| Quantum International Trading Co., Limited | | Live |
| HK Quantum International Trading Co., Limited | | Live |
| QUANTUM INTERNATIONAL TRAVEL LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL QUANTUM ENERGY (INTERNATIONAL) LIMITED | Private company limited by shares | Live |
| QUANTUM INT'L INVESTMENT GROUP CO., LIMITED | Private company limited by shares | Live |
| Quantum Invest Limited | Private company limited by shares | Live |
| QUANTUM INFINITY (INVEST) HOLDING (HK) LIMITED | Private company limited by shares | Live |
| QUANTUM INVESTING LIMITED | Private company limited by shares | Live Commenced dormancy on 30-Jul-2018 |
| QUANTUM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| QUANTUM INVESTMENT LIMITED | Private company limited by shares | Live |
| SDN QUANTUM INVESTMENT LIMITED | Private company limited by shares | Live |
| QUANTUM ASIA INVESTMENT LIMITED | Private company limited by shares | Live |
| Quantum Holding Investment Limited | Private company limited by shares | Live |
| QUANTUM PACIFIC INVESTMENT LIMITED | Private company limited by shares | Live |
| QUANTUM PACIFIC INVESTMENT ADVISOR LIMITED | Private company limited by shares | Live |
| QUANTUM INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Quantum Investments Limited | Private company limited by shares | Live |
| IOTC QUANTUM LIMITED | Private company limited by shares | Live |
| Quantum Jump Co Limited | Private company limited by shares | Live |
| QUANTUM KEYS LIMITED | Private company limited by shares | Live |
| Kingfast Quantum Technology Limited | | Live |
| QUANTUM LABYRINTH TECHNOLOGY CO., LIMITED | | Live |
| Quantum Laser Solutions Limited | Private company limited by shares | Live |
| Global League Quantum Financial Services Co. Limited | Private company limited by shares | Live |
| QUANTUM LEAP LIMITED | Private company limited by shares | Dissolved |
| QUANTUM LEAP COMPANY LIMITED | Private company limited by shares | Live |
| Quantum Leap Asia Limited | Private company limited by shares | Live |
| HK Quantum Leap Co., Limited | Private company limited by shares | Live |
| Quantum Leap Innovative Concepts and Kinetics Limited | Private company limited by shares | Live |
| QUANTUM LEAP CONSULT LIMITED | Private company limited by shares | Live |
| QUANTUM LEAP GLOBAL COMPANY LIMITED | Private company limited by shares | Live |
| Quantum Leap Group Limited | | Live |
| Quantum Leap Holding Co. Limited | Private company limited by shares | Live |
| QUANTUM LEAP INNOVATIONS LIMITED | Private company limited by shares | Dissolved |
| Quantum Leap Innovations Limited | | Live |
| QUANTUM LEAP INVESTMENT LIMITED | Private company limited by shares | Live |
| QUANTUM LEAP TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| QUANTUM LEAPS LIMITED | Private company limited by shares | Dissolved |
| Quantum Life Limited | | Live |
| QUANTUM LIFE HOLDING LIMITED | Private company limited by shares | Dissolved |
| LIGHT - QUANTUM - POWER TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ELECTRON QUANTUM LIGHTS CORPORATION LIMITED | Private company limited by shares | Live |
| Quantum Link Limited | | Live |
| QUANTUM LIVING LIMITED | Private company limited by shares | Dissolved |
| Quantum Living Hub Company Limited | Private company limited by shares | Live |
| NORDIC QUANTUM LLLT LIMITED | | Live |
| QUANTUM LOGIC LIMITED | | Live |
| Quantum Logistics Limited | Private company limited by shares | Live |
| Quantum Logistics (HK) Limited | | Live |
| QUANTUM (XIAMEN) AIR & SEA LOGISTICS CO., LIMITED | Private company limited by shares | Live |
| Quantum Longevity Technology Limited | | Live |
| Quantum Magic Limited | Private company limited by shares | Live |
| QUANTUM MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| QUANTUM MANAGEMENT LIMITED | Private company limited by shares | Live |
| QUANTUM JET MANAGEMENT LIMITED | Private company limited by shares | Live |
| Quantum Assets Management (Asia) Limited | Private company limited by shares | Live |
| QUANTUM SUPPLY CHAIN MANAGEMENT COMPANY LIMITED | Private company limited by shares | Live |
| Quantum China Asset Management Limited | Private company limited by shares | Live |
| CHINESE QUANTUM INVESTMENT MANAGEMENT CO., LIMITED | Private company limited by shares | Live |
| Quantum Hotel Management Limited | Private company limited by shares | Dissolved |
| Quantum Investment Management Limited | Private company limited by shares | Live |
| QUANTUM TRADING MANAGEMENT LIMITED | Private company limited by shares | Live |
| Quantum Wealth Management Limited | Private company limited by shares | Live |
| QUANTUM MARINE LIMITED | Private company limited by shares | Dissolved |
| QUANTUM MARK LIMITED | Private company limited by shares | Dissolved |
| QUANTUM MARKETING LIMITED | Private company limited by shares | Dissolved |
| QUANTUM CHANNEL MARKETING LIMITED | Private company limited by shares | Live |
| Quantum Pacific Marketing Limited | Private company limited by shares | Live |
| Quantum Matrix Limited | Private company limited by shares | Live |
| Quantum Phoenix Media International (HK) Limited | Private company limited by shares | Live |
| Quantum Media Marketing Limited | Private company limited by shares | Dissolved |
| QUANTUM ZENITH MEDIA LIMITED | | Live |
| QUANTUM MEDICAL LIMITED | Private company limited by shares | Live |
| CHINA QUANTUM MEDICAL ASSOCIATION LIMITED | Private company limited by shares | Live |
| Quantum Bio Medicals Limited | Private company limited by shares | Live |
| QUANTUM HI-TECH MEDICINE & EQUIPMENT LIMITED | Private company limited by shares | Dissolved |
| HONG KONG ASSOCIATION OF QUANTUM MEDICINE LIMITED | Company limited by guarantee | Live |
| QUANTUM MEDICINE INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| Quantum Medtech Investment Limited | Private company limited by shares | Live |
| Microcosmic Quantum Limited | Private company limited by shares | Live |
| Sage Microscopic Quantum Technology Co., Limited | Private company limited by shares | Live |
| QUANTUM MINERALS LIMITED | Private company limited by shares | Dissolved |
| MINI QUANTUM LIMITED | Private company limited by shares | Live |
| Minz Quantum Technology Limited | Private company limited by shares | Live |
| Quantum Motorsports Limited | Private company limited by shares | Live |
| QUANTUM NEBULA TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Quantum Netech Limited | Private company limited by shares | Live |
| NEW QUANTUM NETWORK COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUANTUM NETWORKS LIMITED | Private company limited by shares | Dissolved |