The Community of Madrid is the corporate headquarters for many of Spain's largest multinationals (IBEX 35 index members) and international regional offices.
**Notable Companies Headquartered in Madrid:** * **Telefónica:** One of the largest telecommunications companies in the world, headquartered at the sprawling Distrito Telefónica campus. * **Repsol:** A global multi-energy company with its distinctive campus headquarters in the Méndez Álvaro district. * **Banco Santander & BBVA:** While traditionally rooted in Santander and Bilbao, both major banks have massive operational headquarters and corporate campuses in the Madrid region. * **Iberia:** Spain's flag carrier airline, operating its primary hub out of Madrid-Barajas Airport. * **ACS Group:** A major global civil engineering and construction company. * **Amadeus IT Group:** A major European IT provider for the global travel and tourism industry.