| QUAD CENTER ATV MADRID | MADRID |
| QUAD COMPETICION | MADRID |
| QUAD CONSULTING INITIATIVES | MADRID |
| QUAD GRAPHICS SPAIN 1 | MADRID |
| QUAD GRAPHICS SPAIN 2 | MADRID |
| QUAD INTEGRAL | MADRID |
| QUAD OFF ROAD | MADRID |
| QUADERNNA INNOVACION | MADRID |
| QUADRA PANIS | MADRID |
|
|
| QUADRAGENIA INVERSIONES | MADRID |
| QUADRATS EVENTOS | MADRID |
| QUADRATURA ARQUITECTOS | MADRID |
| QUADRATURA CONSULTING INMOBILIARIO | MADRID |
| QUADRAX CONSULTING | MADRID |
| QUADRE BUSINESS | MADRID |
| QUADRIFOGLIO IBERICA | MADRID |
| QUADRIFOGLIO PROJECT GROUP | MADRID |
|
|
| QUADRIFOGLIO VENTURE CAPITAL | MADRID |
| QUADRIGA ASSET MANAGERS SGIIC | MADRID |
| QUADRIGA BUSINESS ESPAÑA | MADRID |
