| QUADRANT COMPUTER SERVICES LIMITED | Private company limited by shares | Dissolved |
| QUADRANT SHIPPING LIMITED | Private company limited by shares | Live |
| QUADRANT SYSTEMS LIMITED | Private company limited by shares | Live |
| Quadrant IV Technology Limited | | Live |
| HK QUADRANT TECHNOLOGY LIMITED | | Live |
| QUADRANT TRADING LIMITED | Private company limited by shares | Dissolved |
| United Quadrant Solution Limited | Private company limited by shares | Live |
| QUADRANT WEALTH LIMITED | Private company limited by shares | Live |
| Quadrant Link Worldwide Limited | Private company limited by shares | Dissolved |
| QUADRA-SCAN LIMITED | Private company limited by shares | Dissolved |
| 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 |
| QUADREP ELECTRONICS (H.K.) LIMITED | Private company limited by shares | Dissolved |
| CHINA QUADRI RESOURCE SERVICE CO., LIMITED | Private company limited by shares | Live |
| QUADRICH COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUADRICS LIMITED | Private company limited by shares | Dissolved |
| QUADRIFAITH LIMITED | Private company limited by shares | Dissolved |
| QUADRIGA HK LIMITED | Private company limited by shares | Live |
| Quadrige Consulting Limited | Private company limited by shares | Live |
| QUADRIGULAE CO., LIMITED | Private company limited by shares | Dissolved |
| QUADRILLIANT COMPANY (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| QUADRILLION CO. LIMITED | Private company limited by shares | Live |
| QUADRIPHARM COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUADRIUM HONG KONG LIMITED | Private company limited by shares | Live |
| QUADRIUNION COMPANY LIMITED | Private company limited by shares | Live |
| QUADRIUNION FINANCE COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUADRIVIA LIMITED | Private company limited by shares | Live |
| Quadrivio Asia Pacific Limited | Private company limited by shares | Live |
| Quadrivium Limited | | Live |
| QUADRO HK LIMITED | Private company limited by shares | Live |
| QUADROCOPTER HK LIMITED | Private company limited by shares | Live |
| QUADROLINK FINANCE LIMITED | Private company limited by shares | Live |
| QUADROLINK GROUP LIMITED | Private company limited by shares | Live |
| Quadrolink Asset Management Limited | Private company limited by shares | Dissolved |
| QUADROLINK RESOURCES LIMITED | Private company limited by shares | Live |
| QUADROLINK SHIPPING LIMITED | Private company limited by shares | Live |
| Quadrotel Limited | Private company limited by shares | Live |
| QUADROTRADE LIMITED | Private company limited by shares | Dissolved |
| Quadrum Investments Limited | Private company limited by shares | Live |
| QUADRUS TECHNOLOGY LIMITED | Private company limited by shares | Live |
| QUADRUTEC (CHINA) ENTERPRISES COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUADRUTEC ENTERPRISES LIMITED | Private company limited by shares | Live |
| QUADRUTEC ESTATE LIMITED | Private company limited by shares | Dissolved |
| QUADRUTEC INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| QUADRUTEC JEWELRY COMPANY LIMITED | Private company limited by shares | Dissolved |
| GUANGZHOU QUADRUTEC HOTEL MANAGEMENT & DEVELOPMENT COMPANY LIMITED | Private company limited by shares | Live |
| The Quads & Company Limited | | Live |
| QUADS MANUFACTURING LIMITED -THE- | Private company limited by shares | Dissolved |
| QUADS TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| New Quadsmart Technology Co., Limited | Private company limited by shares | Live |
| QUADSTAR CORPORATION (ASIA) LIMITED | Private company limited by shares | Dissolved |
| Quadtalent Hong Kong Limited | Private company limited by shares | Live |
| QUADTECH SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Quadtree Analytics Limited | Private company limited by shares | Live |
| Quadtron Limited | Private company limited by shares | Live |
| Quadtrooper Limited | Private company limited by shares | Live |
| QUADWEALTH DEVELOPMENT LIMITED | Private company limited by shares | Live |