| CHINA QUANTUM INDUSTRIAL HOLDINGS GROUP LIMITED | Private company limited by shares | Live |
| QUANTUM INVESTMENT HOLDINGS LIMITED | Private company limited by shares | Live |
| QUANTUM SPORTS HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| Quantum Value Holdings Limited | Private company limited by shares | Live |
| QUANTUM HOLISTIC HEALTH CENTRE LIMITED | Private company limited by shares | Live |
| HONG KONG QUANTUM COSMETICS CO., LIMITED | Private company limited by shares | Live |
| Quantum Design Hong Kong Limited | Private company limited by shares | Live |
| Quantum Group Solar ( Hong Kong ) Limited | Private company limited by shares | Dissolved |
| HONG KONG QUANTUM HEALTH LIMITED | Private company limited by shares | Live |
| QUANTUM HONG KONG LIMITED | Private company limited by shares | Dissolved |
| QUANTUM (HONG KONG) LIMITED | Private company limited by shares | Live |
| Quantum 3D Hong Kong Limited | Private company limited by shares | Live |
| Hong Kong Quantum AI Lab Limited | Company limited by guarantee | Live |
| QUANTUM ENTERPRISE (HONG KONG) LIMITED | Private company limited by shares | Live |
| Quantum Healthcare Hong Kong Limited | Private company limited by shares | Live |
| Quantum Innovations (Hong Kong) Limited | | Live |
| First Quantum Resources (Hong Kong) Limited | Private company limited by shares | Live |
| Quantum HiTech Technology (Hong Kong) Limited | Private company limited by shares | Live |
| Quantum Research Technology (Hong Kong) Limited | | Live |
| Quantum Group Land ( Hong Kong ) Limited | Private company limited by shares | Dissolved |
| Luenmei Quantum (Hong Kong) Limited | Private company limited by shares | Live |
| Quantum OTEC ( Hong Kong ) Limited | Private company limited by shares | Dissolved |
| HONG KONG QUANTUM PHONICS LIMITED | | Live |
| Quantum Pigeon Hong Kong Limited | Private company limited by shares | Live |
| Quantum Property Hong Kong Limited | Private company limited by shares | Live |
| Quantum Gan Quan (Hong Kong) Limited | Private company limited by shares | Dissolved |
| QUANTUM SAILS HONG KONG LIMITED | Private company limited by shares | Live |
| QUANTUM SEAFOODS (HONG KONG) LIMITED | Private company limited by shares | Live |
| Quantum Star Hong Kong Limited | | Live |
| Quantum Storage (Hong Kong) Limited | Private company limited by shares | Live |
| HONG KONG QUANTUM TECH LIMITED | Private company limited by shares | Live |
| HONG KONG BO TONG QUANTUM COMPANY LIMITED | Private company limited by shares | Dissolved |
| Quantum Video (Hong Kong) Limited | | Live |
| HONGKONG QUANTUM LIMITED | Private company limited by shares | Live |
| Quantum Beauty (HongKong) Limited | | Live |
| Quantum Capital (HongKong) Limited | Private company limited by shares | Live |
| Hongkong Quantum International Co., Limited | Private company limited by shares | Live |
| HONGKONG QUANTUM INTERNATIONAL INVESTMENT CO., LIMITED | | Live |
| HONGKONG QUANTUM ELECTRON SCIENCE CO., LIMITED | Private company limited by shares | Dissolved |
| HONGKONG HUAREN QUANTUM SCIENCE FEDERATION LIMITED | Private company limited by shares | Live |
| QUANTUM (HONGKONG) FINANCIAL RESEARCH INSTITUTE LIMITED | Private company limited by shares | Live |
| QUANTUM (HONGKONG) FORWARDING LIMITED | Private company limited by shares | Live |
| HONGKONG QUANTUM SKY GROUP LIMITED | Private company limited by shares | Live |
| GS Quantum (HongKong) Group Co., Limited | Private company limited by shares | Live |
| HONGKONG QUANTUM COMPOUND INVESTMENT GROUP LIMITED | Private company limited by shares | Live |
| HONGKONG QUANTUM HOLDING LIMITED | Private company limited by shares | Live |
| Quantum Industrial (HongKong) Limited | Private company limited by shares | Live |
| HongKong Quantum Industrial International Limited | Private company limited by shares | Live |
| HongKong Quantum Investment Management Co., Limited | Private company limited by shares | Live |
| HONGKONG QUANTUM RACING COMPANY LIMITED | Private company limited by shares | Live |
| Quantum Surgical HongKong Co. Limited | | Live |
| QUANTUM TECHNOLOGY (HONGKONG) COMPANY LIMITED | Private company limited by shares | Live |
| HONGKONG QUANTUM TECHNOLOGY GROUP LIMITED | Private company limited by shares | Dissolved |
| HONGKONG GUANGWU QUANTUM TECHNOLOGY LIMITED | Private company limited by shares | Live |
| QUANTUM HORTICULTURE LIMITED | Private company limited by shares | Dissolved |
| QUANTUM HOTELS LIMITED | Private company limited by shares | Live |
| QUANTUM HOUSE SURVEYORS LIMITED | Private company limited by shares | Dissolved |
| Quantum House Trading Limited | Private company limited by shares | Live |
| Quantum Human Capital Limited | Private company limited by shares | Live |
| QUANTUM HYDROGEN LIMITED | Private company limited by shares | Live |
| Quantum Icloud Limited | Private company limited by shares | Live |
| Quantum MRI and Imaging Centre Limited | Private company limited by shares | Live |
| QUANTUM STRATEGIC INCORPORATION LIMITED | Private company limited by shares | Live |
| ATP QUANTUM INDEX CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| QUANTUM INDUSTRIAL CO. LIMITED | Private company limited by shares | Dissolved |
| QUANTUM INDUSTRIAL LIMITED | Private company limited by shares | Live |
| QUANTUM INDUSTRIAL (CHINA) LIMITED | Private company limited by shares | Live |
| Quantum Industry Limited | Private company limited by shares | Dissolved |
| INFINITY QUANTUM HOLDING LIMITED | | Live |
| Quantum information Corporation Limited | Private company limited by shares | Live |
| Quantum Innovation Limited | Private company limited by shares | Live |
| Quantum Computing Innovation Company Limited | | Live |
| Quantum Innovations Limited | | Live |
| Quantum Intelligence Limited | Private company limited by shares | Live |
| QUANTUM INTELLIGENCE (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| QUANTUM MARKET INTELLIGENCE LIMITED | Private company limited by shares | Live |
| INTELLIGENT QUANTUM LIMITED | Private company limited by shares | Live |
| QUANTUM INTERACTIVE LIMITED | | Live |
| QUANTUM INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| QUANTUM INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| QUANTUM INTERNATIONAL LIMITED | Private company limited by shares | Live |
| T & S QUANTUM INTERNATIONAL LIMITED | Private company limited by shares | Live |
| QUANTUM INTERNATIONAL LIMITED | | Live |
| INTERNATIONAL QUANTUM NUTRITION ACADEMY LIMITED | Private company limited by shares | Live |
| QUANTUM INTERNATIONAL HOLDING (HK) CO., LIMITED | | Live |
| INTERNATIONAL QUANTUM SCIENCE & CULTURE LIMITED | Private company limited by shares | Live |
| Quantum Engineering International (HK) Limited | Private company limited by shares | Live |
| QE (QUANTUM EQUILIBRIUM) INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| QUANTUM INTERNATIONAL GROUP LIMITED | Private company limited by shares | Live |
| QUANTUM INTERNATIONAL GROUP STOCK CO., LIMITED | Private company limited by shares | Live |
| Quantum International Holding Group Limited | Private company limited by shares | Dissolved |
| Quantum International Investment Group Company Limited | Private company limited by shares | Live |
| Quantum International (HK) Limited | Private company limited by shares | Live |
| QUANTUM HOMOEOPATHY INTERNATIONAL LIMITED | Private company limited by shares | Live |
| Quantum Group International (Hong Kong) Limited | Private company limited by shares | Live |
| Quantum International Investment Company Limited | Private company limited by shares | Live |
| QUANTUM INTERNATIONAL INVESTMENT HOLDING LIMITED | Private company limited by shares | Live |
| USA LIFE QUANTUM INTERNATIONAL GROUP CO., LIMITED | Private company limited by shares | Live |
| QUANTUM INTERNATIONAL MANAGEMENT CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| QUANTUM MARCH CAPITAL INTERNATIONAL LIMITED | Private company limited by shares | Live |