| Quantum Nexus Limited | | Live |
| Quantum Nourish Limited | | Live |
| OMEGA QUANTUM LIMITED | Private company limited by shares | Live |
| Oriental Quantum Optoelectronics Co., Limited | Private company limited by shares | Live |
| Quantum Charity Organization Company Limited | | Live |
| QUANTUM PACIFIC LIMITED | Private company limited by shares | Dissolved |
| QUANTUM PACIFIC COMPANY LIMITED | | Live |
| QUANTUM PACIFIC CAPITAL LIMITED | Private company limited by shares | Live |
| QUANTUM NETWORKS ASIA PACIFIC LIMITED | Private company limited by shares | Dissolved |
| Quantum Packaging Limited | Private company limited by shares | Live |
| Quantum Partners Limited | | Live |
| Quantum Capital Partners Limited | | Live |
| China Quantum Partners Limited | Private company limited by shares | Live |
| Quantum Leaps Capital Partners Co. Limited | Private company limited by shares | Live |
| QUANTUM TRADE PARTNERS COMPANY LIMITED | Private company limited by shares | Dissolved |
| Quantum Venture Partners Limited | Private company limited by shares | Live |
| Quantum Peak Investment Limited | Private company limited by shares | Live |
| QUANTUM PETROLEUM INVESTMENT LIMITED | Private company limited by shares | Live |
| QUANTUM PHARMACEUTICALS LIMITED | Private company limited by shares | Live |
| Quantum Group Photoelectric ( Hong Kong ) Limited | Private company limited by shares | Live |
| QUANTUM PICTURE (HONG KONG) LIMITED | | Live |
| Quantum Public Entrepreneurship Platform Co., Limited | Private company limited by shares | Live |
| Quantum Platform Holding Group Company Limited | | Live |
| Quantum Power Limited | Private company limited by shares | Live |
| Quantum Prep Limited | Private company limited by shares | Live |
| Quantum Prime Trading Limited | | Live |
| QUANTUM PRODUCT SOLUTIONS GROUP LIMITED | Private company limited by shares | Live |
| Quantum Safety Product Limited | Private company limited by shares | Live |
| QUANTUM PRODUCT SOLUTIONS LIMITED | Private company limited by shares | Live |
| QUANTUM PRODUCTION LIMITED | | Live |
| Quantum Lighting Products (Hong Kong) Limited | Private company limited by shares | Live |
| QUANTUM LIGHTING PRODUCTS LIMITED | Private company limited by shares | Live |
| QUANTUM PROFESSIONAL MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| QUANTUM PROFESSIONAL MANAGEMENT HOLDING LIMITED | Private company limited by shares | Dissolved |
| Lead Quantum Prosper Limited | Private company limited by shares | Live |
| QUANTUM PROTECTION LIMITED | | Live |
| QUANTUM RESEARCH & PUBLISHING LIMITED | Private company limited by shares | Dissolved |
| QUANTUM ASSET MANAGEMENT (QAM) LIMITED | Private company limited by shares | Dissolved |
| CHINA QIANHUI QUANTUM BIOMEDICAL TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Quantum Real Estate Limited | Private company limited by shares | Live |
| Quantum Relations Limited | Private company limited by shares | Dissolved |
| Quantum Renaissance Limited | Private company limited by shares | Live |
| Quantum Repair Service Limited | | Live |
| Quantum Wisdom Research Limited | Private company limited by shares | Live |
| FUSION QUANTUM RESONANCE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| QUANTUM RESOURCE ASIA LIMITED | Private company limited by shares | Live |
| QUANTUM RESOURCES LIMITED | Private company limited by shares | Dissolved |
| Quantum River Limited | Private company limited by shares | Live |
| QUANTUM RUNNERS COMPANY LIMITED | Private company limited by shares | Dissolved |
| China Quantum Science Academy Co., Limited | Private company limited by shares | Live |
| QUANTUM SCIENCE INT'L EDUCATION INSTITUTE LIMITED | | Live |
| QUANTUM ENERGY SCIENCE AND TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| Quantum Life Science Limited | Private company limited by shares | Live |
| HK QUANTUM SCIENCE APPLIED RESEARCH LIMITED | Private company limited by shares | Live |
| CHINA QUANTUM SCIENCE AND TECHNOLOGY CENTER LIMITED | Private company limited by shares | Live |
| Quantum Scientia Limited | Private company limited by shares | Live |
| QUANTUM PACIFIC SECURITIES (H.K.) CO., LIMITED | Private company limited by shares | Dissolved |
| Quantum Semiconductor HK Limited | Private company limited by shares | Live |
| Quantum Semiconductor Asia Limited | | Live |
| QUANTUM SENSES HK LIMITED | Private company limited by shares | Live |
| Quantum Service Provider Limited | Private company limited by shares | Live |
| QUANTUM SERVICES LIMITED | Private company limited by shares | Dissolved |
| QUANTUM CONSULTING SERVICES LIMITED | Private company limited by shares | Dissolved |
| Quantum Corporate Services Limited | | Live |
| QUANTUM SERVICES TRADING & DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| QUANTUM ENGINEERING & SERVICES LIMITED | | Live |
| Quantum Financial Services Limited | Private company limited by shares | Live |
| QUANTUM FINANCIAL SERVICES GROUP LIMITED | Private company limited by shares | Live |
| Quantum Global Services Limited | Private company limited by shares | Live |
| QUANTUM MANAGEMENT SERVICES LIMITED | Private company limited by shares | Dissolved |
| Quantum Shift Limited | Private company limited by shares | Live |
| SINGLE QUANTUM (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| Social Quantum Limited | Private company limited by shares | Live |
| Humanities Social Quantum Technology Limited | Private company limited by shares | Live |
| QUANTUM SOLUTION LIMITED | Private company limited by shares | Live |
| Quantum Solutions Limited | Private company limited by shares | Dissolved |
| Quantum Solutions Co. Limited | Private company limited by shares | Live |
| Quantum Solutions Limited | | Live |
| QUANTUM ASIA SOLUTIONS LIMITED | Private company limited by shares | Live |
| Quantum Business Solutions Limited | Private company limited by shares | Live |
| Quantum Horizon Solutions Limited | | Live |
| QUANTUM UNIT SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| Quantum Sparkle Enterprise Limited | Private company limited by shares | Live |
| QUANTUM SPORT LIMITED | Private company limited by shares | Dissolved |
| Quantum Sports Limited | Private company limited by shares | Live |
| Start Quantum Limited | Private company limited by shares | Live |
| Quantum Station Technology Limited | Private company limited by shares | Live |
| Quantum Strategic Limited | | Live |
| Quantum Strategy Limited | Private company limited by shares | Live |
| Quantum Space Studio Limited | Private company limited by shares | Live |
| QUANTUM STUDIOS LIMITED | Private company limited by shares | Dissolved |
| Quantum Creative Studios Limited | Private company limited by shares | Live |
| Sunshine Quantum Investment Limited | Private company limited by shares | Live |
| QUANTUM SUPPLIES CO. LIMITED | Private company limited by shares | Live |
| Quantum Synergy Solutions Limited | | Live |
| QUANTUM SYSTEM SOLUTIONS LIMITED | Private company limited by shares | Live |
| Quantum Systems Limited | Private company limited by shares | Live |
| Green Tech Agarwood Quantum Research Limited | Private company limited by shares | Live |
| Quantum Communicational Tech Share (HK) Limited | Private company limited by shares | Live |
| QUANTUM TECH SOLUTIONS LIMITED | Private company limited by shares | Live |