| Quadrat (Hong Kong) Company Limited | Private company limited by shares | Live |
| QUADRATA INVESTMENTS LIMITED | Private company limited by shares | Live |
| QuadRate Limited | Private company limited by shares | Live |
| QUADRATIC CAPITAL LIMITED | Private company limited by shares | Live |
| HK THE QUADRATIC DRESS LIMITED | Private company limited by shares | Live |
| QUADRATIC INVESTMENT LIMITED | Private company limited by shares | Live |
| Quadratic Success Limited | Private company limited by shares | Live |
| QUADRATRON LIMITED | Private company limited by shares | Dissolved |
| QUADRATUS LIMITED | Private company limited by shares | Dissolved |