| Company Name | Type | Status |
|---|---|---|
| QUARTET FS HK LIMITED | Private company limited by shares | Live |
| Quartet BSG Company Limited | Private company limited by shares | Live |
| Quartet Limited | Live | |
| Quartet HK Limited | Live | |
| QUARTET LUCK LIMITED | Private company limited by shares | Dissolved |
| Quartetech Limited | Private company limited by shares | Live |
| QUARTETTE INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |