| AMERICA QUANTUM TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| QUANTUM BASE TECHNOLOGY CO., LIMITED | | Live |
| Quantum Investment (China) Co., Limited | Private company limited by shares | Live |
| Quantum Chip technology Co., Limited | | Live |
| Quantum Electric CO., LIMITED | Private company limited by shares | Live |
| QUANTUM GLOBAL INTERNATIAL CO., LIMITED | Private company limited by shares | Dissolved |
| CNE QUANTUM GROUP CO., LIMITED | Private company limited by shares | Live |
| HONG KONG QUANTUM TECHNOLOGY CO., LIMITED | | Live |
| QUANTUM FINANCIAL MANAGEMENT CO., LIMITED | Private company limited by shares | Live |
| Quantum Materials (Asia) Share Co., Limited | Private company limited by shares | Live |
| Shenzhen Quantum Optoelectronic Co., Limited | Private company limited by shares | Dissolved |
| Quantum Technology Co., Limited | Private company limited by shares | Live |
| Quantum Ant Technology Co., Limited | Private company limited by shares | Live |
| Quantum age Technology Co., Limited | Private company limited by shares | Live |
| Quantum ST Technology Co., Limited | Private company limited by shares | Live |
| Quantum Era Technology Co., Limited | Private company limited by shares | Live |
| QUANTUM TECHNOLOGY ASIA CO., LIMITED | Private company limited by shares | Live |
| Mongolian Quantum Trading Co., Limited | Private company limited by shares | Live |
| UK&HK QUANTUM TECHNOLOGY CO., LIMITED | Private company limited by shares | Dissolved |
| Quantum Steps Coaching & Consulting Limited | Private company limited by shares | Dissolved |
| QUANTUM COMM. NETWORKS LIMITED | Private company limited by shares | Live |
| Quantum Commercial Limited | Private company limited by shares | Live |
| Quantum Communication Company Limited | Private company limited by shares | Live |
| Quantum Communication Hong Kong Limited | Private company limited by shares | Live |
| QUANTUM COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| Quantum Communications (HK) Limited | Private company limited by shares | Live |
| QUANTUM CONCEPTS LIMITED | Private company limited by shares | Live |
| Quantum Connectivity Co., Limited | | Live |
| CONSORCIO QUANTUM SA LIMITED | Private company limited by shares | Live |
| QUANTUM INVESTMENT CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| QUANTUM LEAP CONSULTANTS & DEVELOPMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUANTUM ARC CONSULTATION LIMITED | Private company limited by shares | Live |
| QUANTUM CONSULTING LIMITED | | Live |
| QUANTUM CAPITAL AND CONSULTING LIMITED | Private company limited by shares | Live |
| QUANTUM MERUIT CONSULTING LIMITED | Private company limited by shares | Live |
| BAO SENG NEW QUANTUM (CONTINENTAL) LIMITED | Private company limited by shares | Live |
| Quantum Automatic Control Technique Co., Limited | Private company limited by shares | Live |
| QUANTUM CORPORATION LIMITED | Private company limited by shares | Dissolved |
| GRAND QUANTUM INVESTMENT CORPORATION LIMITED | Private company limited by shares | Live |
| Quantum Creations Limited | Private company limited by shares | Live |
| QUANTUM CREATIVES LIMITED | Private company limited by shares | Live |
| QUANTUM CROSS ENTERPRISE LIMITED | Private company limited by shares | Live |
| Quantum Cube Limited | | Live |
| QUANTUM CYBERTECH LIMITED | Private company limited by shares | Live |
| QUANTUM DANCE LIMITED | | Live |
| QUANTUM DATA SYSTEMS LIMITED | Private company limited by shares | Live |
| QUANTUM DESIGNS INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| QUANTUM DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| Quantum Development Limited | Private company limited by shares | Live |
| SJP HS Quantum Intelligent Development Shares Co., Limited | Private company limited by shares | Live |
| QUANTUM DEVELOPMENT (H.K.) LIMITED | Private company limited by shares | Dissolved |
| QUANTUM DYNAMIC HOLDING LIMITED | Private company limited by shares | Live |
| EAST QUANTUM CO., LIMITED | Private company limited by shares | Live |
| Quantum Edge HK Limited | Private company limited by shares | Live |
| QUANTUM EDUCATION LIMITED | Private company limited by shares | Live |
| Quantum Electrodynamics Limited | Private company limited by shares | Live |
| Alef Electromagnetic And Quantum Investments Co., Limited | | Live |
| Quantum Electronic Limited | Private company limited by shares | Live |
| QUANTUM ELECTRONICS COMPANY LIMITED | Private company limited by shares | Dissolved |
| Quantum New Energy Co., Limited | Private company limited by shares | Live |
| QUANTUM ENERGY SYSTEMS (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| CHINA QUANTUM ENERGY INVESTMENT MANAGEMENT LIMITED | Private company limited by shares | Live |
| QUANTUM ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| Quantum Engineering Limited | Private company limited by shares | Live |
| Quantum Engineering (Hong Kong) Co., Limited | Private company limited by shares | Live |
| Quantum Force Engineering Limited | Private company limited by shares | Live |
| QUANTUM ENTANGLEMENT LIMITED | Private company limited by shares | Live |
| QUANTUM ENTERPRISE LIMITED | Private company limited by shares | Live |
| QUANTUM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| Quantum Entertainment Limited | | Live |
| QUANTUM ENERGY SAVING ENVIRONMENTAL LIMITED | Private company limited by shares | Live |
| Quantum Epoch Network Technology Limited | Private company limited by shares | Live |
| Quantum Innovation Equity Limited | Private company limited by shares | Dissolved |
| Quantum eTrade Limited | Private company limited by shares | Live |
| QUANTUM EURO-ASIA LIMITED | Private company limited by shares | Dissolved |
| QUANTUM FABRICS LIMITED | Private company limited by shares | Dissolved |
| Quantum Fantasy Technology Limited | | Live |
| QUANTUM (FAR EAST) COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUANTUM FASHION LIMITED | Private company limited by shares | Live |
| Quantum Fertilisers Limited | Private company limited by shares | Live |
| QUANTUM FIELDS LIMITED | Private company limited by shares | Dissolved |
| Quantum Financial Service Limited | Private company limited by shares | Live |
| QUANTUM FINTECH PAYMENT LIMITED | Private company limited by shares | Live |
| QUANTUM LIGHTING FIXTURE LIMITED | Private company limited by shares | Dissolved |
| Franc XLM Quantum Biotechnology Limited | Private company limited by shares | Live |
| Quantum Frontier Limited | Private company limited by shares | Live |
| Quantum Frozen Food Limited | Private company limited by shares | Live |
| Quantum Fund Administration Services Company Limited | Private company limited by shares | Live |
| QUANTUM FUND (CHINA) LIMITED | Private company limited by shares | Dissolved |
| Quantum Hedge Fund Limited | Private company limited by shares | Live |
| Quantum Technologies Fund Limited | Private company limited by shares | Live |
| Quantum Future Limited | | Live |
| Quantum Gain Limited | Private company limited by shares | Live |
| QUANTUM GAME LIMITED | Private company limited by shares | Live |
| QUANTUM GLOBAL LIMITED | Private company limited by shares | Live |
| Global Quantum Limited | | Live |
| Quantum Global Assets Limited | Private company limited by shares | Live |
| Quantum Global Group Limited | Private company limited by shares | Live |
| Quantum Global Introducers Limited | Private company limited by shares | Live |
| Quantum Global Solutions Limited | Private company limited by shares | Live |