INTERNATIONAL
- Ecuador State Bank
- European Commission
- PROACTIVA, Aguas del Archipielago (Colombia)
IN SPAIN
Public Administration
State Level
- MINISTRY OF PUBLIC WORKS: Directorate- General of Roads, Directorate-General of Railways, ADIF.
- MINISTRY OF THE ENVIRONMENT: Directorate – General of Coasts, National Park Autonomous Body
- MINISTRY OF DEFENCE
Autonomous Community Level
- Autonomous Community of Madrid
- Autonomous Community of Castile and Leon
- Autonomous Community of Castile La Mancha
- Government of Canary Islands
- Alava Regional Government
- Extremadura Regional Government
Local Level
- MADRID CITY COUNCIL
- Fuenlabrada City Council
- EMUVISA (Municipal Housing and Land Company in Arroyomolinos)
- Villanueva del Pardillo Town Council
- Valencia Regional Government
- Amieva Town Council
Private Companies
Construction Companies
- ACCIONA Infraestructuras
- ALDESA Construcciones
- AZVI
- Comsa
- Corsan-Corviam
- Coprosa
- DRAGADOS
- DRACE
- Ferrovial
- FCC Construccion
- OHL
- Pioder
- Sando
- SACYR
- Viasa y Construcciones
- Vera Construcciones
Major Corporations
- RENFE
- Canal de Isabel II
- Aguas de Valencia
Concessionaires
- AZVI Concesiones
- HENARSA
- OHL Concesiones
- Isolux – Corsan Concesiones
Developers
- Anida (Grupo BBVA)
- SERIN Servicios Inmobiliarios
Others
- Seville Chamber of Commercee