| Company Name | Type | Status |
|---|---|---|
| QuantumS Limited -The- | Private company limited by shares | Live |
| QuantumSailing Technologies Limited | Live | |
| QUANTUMSIL LIMITED | Private company limited by shares | Live |
| Quantumsis Co., Limited | Live | |
| Quantumsolve Limited | Live | |
| Quantumspace Limited | Live | |
| SHENZHEN QUANTUMSTAR TECHNOLOGY CO., LIMITED | Private company limited by shares | Dissolved |