Economic analysis of the Viaducto Bicentenario concession title prepared by EY

May 20, 2015

The Company, OBRASCON HUARTE LAIN, S.A. (OHL), in compliance with current
legislation, hereby reports the following Significant Event:

Significant Event

Please find attached English translation of EY’s Executive Summary as a follow up to
the Significant Event published this morning (RNS Number: 7702N).

Download the Economic analysis of the Viaducto Bicentenario