| 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 |
| Quantum Technology Global Limited | Private company limited by shares | Live |
| Quantum Global Trade Limited | Private company limited by shares | Live |
| Quantum Global Trade Limited | Private company limited by shares | Live |
| Graceful Love Quantum Technology Company Limited | Private company limited by shares | Live |
| QUANTUM GRAVITATION TECHNOLOGY LIMITED | Private company limited by shares | Live |
| GREAT QUANTUM LIMITED | Private company limited by shares | Live |
| QUANTUM GREENERGY COMPANY LIMITED | Private company limited by shares | Live |
| QUANTUM GROUP LIMITED -THE- | Private company limited by shares | Dissolved |
| QUANTUM GROUP LIMITED | Private company limited by shares | Live |
| BO RUI QUANTUM GROUP COMPANY LIMITED | Private company limited by shares | Live |
| QUANTUM GROUP (ASIA) LIMITED | Private company limited by shares | Live |
| CHINA FINANCE QUANTUM GROUP CO., LIMITED | Private company limited by shares | Live |
| China Quantum Chip Group Co., Limited | Private company limited by shares | Live |
| Quantum Financial Group Limited | | Live |
| Quantum Fintech Group Limited | | Live |
| Quantum Technology Group ( Hong Kong ) Limited | Private company limited by shares | Live |
| CHINA QUANTUM INDUSTRY GROUP CO., LIMITED | Private company limited by shares | Live |
| Quantum Investment Group Limited | Private company limited by shares | Live |
| QUANTUM LIGHTING GROUP LIMITED | Private company limited by shares | Dissolved |
| Social Quantum Group Limited | | Live |
| QUANTUM TALENT GROUP LIMITED | Private company limited by shares | Live |
| Jiaxin Quantum Technology Group Co., Limited | | Live |
| Quantum Software Technology Group Co., Limited | | Live |
| QUANTUM POWER GROUPS COMPANY LIMITED | Private company limited by shares | Live |
| Quantum Growth Limited | Company limited by guarantee | Live |
| QUANTUM GROWTH LAB LIMITED | | Live |
| QUANTUM GROWTH CO., LIMITED | | Live |
| Guodun Tianji Quantum Group Limited | Private company limited by shares | Live |
| QUANTUM HEALING CENTRE LIMITED | Private company limited by shares | Live |
| Quantum Health Limited | Private company limited by shares | Live |
| QUANTUM BEAUTY HEALTH CENTRE LIMITED | Private company limited by shares | Live |
| Quantum Health Centre Limited | Private company limited by shares | Live |
| Quantum Digital Health Limited | | Live |
| Quantum HealthTech Limited | Private company limited by shares | Live |
| Quantum Hedge Limited | Private company limited by shares | Dissolved |
| HIDDEN QUANTUM LIMITED | Private company limited by shares | Live |
| GERMANY QUANTUM HIGH TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| QUANTUM GE HIGHTECH LIMITED | Private company limited by shares | Live |
| Quantum Hi-Tech (HK) Biological Limited | Private company limited by shares | Live |
| QUANTUM DATA SYSTEMS (H.K.) LIMITED | Private company limited by shares | Live |
| QUANTUM ELECTRICAL (HK) CO., LIMITED | Private company limited by shares | Live |
| QUANTUM GOLD H.K. LIMITED | Private company limited by shares | Live |
| GoldPort Quantum (HK) Capital Management Co. Limited | Private company limited by shares | Live |
| Quantum Innovation Holding (HK) Limited | Private company limited by shares | Live |
| Quantum Innovation (HK) Limited | | Live |
| Krown Quantum (HK) Limited | Private company limited by shares | Live |
| QUANTUM LEAP (HK) CO. LIMITED | Private company limited by shares | Live |
| Quantum L.S. PR (HK) Limited | Private company limited by shares | Live |
| QUANTUM CAPITAL MANAGEMENT (HK) LIMITED | Private company limited by shares | Live |
| Quantum Medical Investment Group (HK) Limited | Private company limited by shares | Live |