With more than 210,000 employees and 2016 revenue exceeding $ 37.30bn , ACS stands as one of Europe ’ s most prominent construction companies . Under the leadership of CEO Florentino Pérez , ACS has grown divisions that include residential and non-residential construction , infrastructure , services , industrial companies and minority investments . In 2011 , it upped its stake in Hochtief to more than 50 %, effectively taking ownership . It ’ s major notable successes include the Alqueva Dam , Palau de les Arts Reina Sofia , Torre Agbar , LGV Perpignan – Figueres High Speed railway and the Portugués Dam in Ponce , Puerto Rico , among others . 46 January 2018