| 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 |
| Quantumbro Co., Limited | | Live |
| QUANTUMCODE LIMITED | | Live |
| QuantumCyte Technology Limited | Private company limited by shares | Live |
| Quantumdots Limited | | Live |
| QuantumFabless Limited | Private company limited by shares | Live |
| QUANTUMFACTORY CO. LIMITED | Private company limited by shares | Live |
| QuantumFlow Limited | | Live |
| QuantumForge Limited | | Live |
| QUANTUMIZE LIMITED | | Live |
| QuantumKDB Limited | Private company limited by shares | Live |
| Quantumlink Limited | Private company limited by shares | Dissolved |
| QuantumMeta Limited | | Live |
| QUANTUMMIND SOLUTIONS HONG KONG LIMITED | | Live |
| QuantumNova Limited | | Live |
| QuantumPharm Limited | Private company limited by shares | Live |
| QUANTUMPLAN LIMITED | Private company limited by shares | Dissolved |
| QuantumPulse Enterprises Limited | | Live |
| QuantumS Limited -The- | Private company limited by shares | Live |
| QUANTUMSIL LIMITED | Private company limited by shares | Live |
| Quantumsis Co., Limited | | Live |
| Quantumspace Limited | | Live |
| SHENZHEN QUANTUMSTAR TECHNOLOGY CO., LIMITED | Private company limited by shares | Dissolved |
| QuantumTech Limited | | Live |
| Carl Quantum-Tech Co., Limited | | Live |
| QUANTUMTEK CO., LIMITED | Private company limited by shares | Live |
| Quantumtime Limited | Private company limited by shares | Live |
| QuantumTrust Solutions Limited | | Live |
| QuantumTX Hong Kong Limited | | Live |
| Quantumverse Limited | | Live |
| QuantumWhale Limited | | Live |
| QUANTURN LIMITED | Private company limited by shares | Live |
| QUANTUS LIMITED | Private company limited by shares | Live |
| Quantus Inc Limited | Private company limited by shares | Live |
| Quantweb Limited | Private company limited by shares | Live |
| QUANTWIN LIMITED | Private company limited by shares | Live |
| QUANTZ LIMITED | Private company limited by shares | Dissolved |
| QUAN-V ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| QUANVAST LIMITED | Private company limited by shares | Dissolved |
| QUANVAST DEVELOPMENTS LIMITED | Private company limited by shares | Dissolved |
| QUANVAST INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| QUANVIEW INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Quanwang Trade Im & Ex Limited | Private company limited by shares | Live |
| QUANWAY COMPANY LIMITED | Private company limited by shares | Live |
| QUANWELL LIMITED | Private company limited by shares | Dissolved |
| QUANWEN TRADING CO., LIMITED | Private company limited by shares | Live |
| QUANWIN LIMITED | Private company limited by shares | Dissolved |
| QUANWIN ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| QUANWIN INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| QUANWITS GROUP LIMITED | Private company limited by shares | Live |
| QuanX Lab Limited | | Live |
| QuanX Lab Custody Limited | | Live |
| Quanxi Group Co., Limited | | Live |
| Quanxi International Limited | | Live |
| QUANXI EDUCATION INTERNATIONAL GROUP (CHINA) LIMITED | Private company limited by shares | Live |
| HK QUANXI INT'L FOOD CO., LIMITED | Private company limited by shares | Dissolved |
| JAPAN QUANXI REFLEXOTHERAPY COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUANXI INVESTMENT MANAGE LIMITED | Private company limited by shares | Live |
| HK TIANYING QUANXI TECHNOLOGY LIMITED | Private company limited by shares | Live |
| QUANXI WORLD TECHNOLOGY (HONG KONG) LIMITED | Private company limited by shares | Live |
| QUANXILI CO., LIMITED | Private company limited by shares | Live |
| Li Quanxin Limited | | Live |
| QUANXIN TRADE CO., LIMITED | Private company limited by shares | Live |
| QUANXIN TECHNOLOGY LIMITED | | Live |
| HK QUANXIN TRADING LIMITED | Private company limited by shares | Live |
| QUANXIN SHOES TRADING LIMITED | Private company limited by shares | Dissolved |
| QUANXING TOY GIFT CO., LIMITED | Private company limited by shares | Dissolved |
| HK QUANXING ENTERPRISES LIMITED | Private company limited by shares | Live |
| QUANXING GROUP LIMITED | Private company limited by shares | Live |
| HK QUANXING GROUP HOLDING LIMITED | Private company limited by shares | Live |
| HONG KONG QUANXINGMEIFU UNIFIED GROUP LIMITED | Private company limited by shares | Live |
| Quanxingtong Co., Limited | Private company limited by shares | Live |
| Quanxinyuan International Co., Limited | Private company limited by shares | Live |