| 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 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 |
| QUANTUM POWER TECHNICAL COMPANY LIMITED | Private company limited by shares | Live |
| Quantum Technologies Pte Limited | Private company limited by shares | Live |
| Quantum Digital Technologies Limited | | Live |
| Quantum Health Technologies Limited | Private company limited by shares | Live |
| QUANTUM TECHNOLOGIES HOLDING COMPANY LIMITED | Private company limited by shares | Live |
| QUANTUM INNOVATION TECHNOLOGIES LIMITED | Private company limited by shares | Live |
| QUANTUM TECHNOLOGIES SYSTEMS LIMITED | Private company limited by shares | Live |
| QUANTUM TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| QUANTUM TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| QUANTUM KEY TECHNOLOGY LIMITED | Private company limited by shares | Live |
| QUANTUM BEAN MASTER TECHNOLOGY LIMITED | | Live |
| CHINA BEIDOU QUANTUM TECHNOLOGY GROUP LIMITED | Private company limited by shares | Live |
| China quantum biology technology Co., Limited | Private company limited by shares | Live |
| CHINA QUANTUM TECHNOLOGY LIMITED | Private company limited by shares | Live |
| China Quantum Technology Group Limited | Private company limited by shares | Live |
| China 33 Princess Quantum Technology Limited | Private company limited by shares | Live |
| Quantum Technology Enterprise Limited | Private company limited by shares | Live |
| Quantum Exploration Technology Co., Limited | | Live |
| FUNWOO QUANTUM TECHNOLOGY LIMITED | Private company limited by shares | Live |
| QUANTUM RADIO TECHNOLOGY (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| CHINA QUANTUM TECHNOLOGY INDUSTRY GROUP LIMITED | Private company limited by shares | Live |
| Quantum Interactive Technology Limited | | Live |
| Quantum Leap Financial Technology Limited | Private company limited by shares | Live |
| QUANTUM MATRIX TECHNOLOGY LIMITED | | Live |
| Quantum Music Technology Limited | | Live |
| Quantum Smart Technology LIMITED | Private company limited by shares | Live |
| Quantum Star Micro-electronics Technology Co. Limited | Private company limited by shares | Live |
| Super Quantum Innovation Technology Co., Limited | | Live |
| Yangpu Quantum Technology Company Limited | Private company limited by shares | Live |
| Zhongbao Quantum Technology Limited | | Live |
| QUANTUM TECNOLOGIA S.A. LIMITED | Private company limited by shares | Live |
| QUANTUM TELECOM LIMITED | Private company limited by shares | Dissolved |
| QUANTUM TEXTILE ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| Quantum Group Thermal ( Hong Kong ) Limited | Private company limited by shares | Dissolved |
| QUANTUM CREEK TIRES LIMITED | Private company limited by shares | Live |
| QUANTUM TRADE COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUANTUM TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUANTUM TRADING LIMITED | Private company limited by shares | Live |
| Quantum Trading Limited | Private company limited by shares | Live |
| Quantum Capital Trading Limited | Private company limited by shares | Live |
| QUANTUM METAL TRADING LIMITED | Private company limited by shares | Live |
| Quantum Wisdom Trading Limited | | Live |
| QUANTUM TRAINING LIMITED | Private company limited by shares | Live |
| Quantum Trust Limited | | Live |
| UNIVERSAL QUANTUM ENERGY LIMITED | Private company limited by shares | Live |
| Universal Holographic Quantum Extracts Limited | Private company limited by shares | Live |
| Quantum Universe (HK) Limited | Private company limited by shares | Live |
| Quantum Capital Unlimited HK Limited | Private company limited by shares | Live |
| Vaultavo Quantum Limited | | Live |
| Quantum Ventures Limited | | Live |
| Quantum Mining Ventures Limited | Private company limited by shares | Live |
| Quantum Vortex Limited | Private company limited by shares | Live |
| Quantum Water Technologies Limited | Private company limited by shares | Live |
| QUANTUM WINSOME LIMITED | Private company limited by shares | Dissolved |
| QUANTUM WORLD LIMITED | Private company limited by shares | Live |
| QUANTUMAX INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| AMCHI QUANTUMBIO SCIENCE (HK & MACAU) LIMITED | Private company limited by shares | Live |
| Quantumbit Limited | Private company limited by shares | Live |