The CNBV authorize Magenta Infraestructura’s extension of the term of the CTO of OHL Mexico’s

July 11, 2017

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

Significant Event

OHL announces that it Mexican subsidiary OHL MEXICO, S.A. de C.V. has notified the market the following statement:

“The CNBV Issues Authorization in connection with Magenta Infraestructura’s Extension of the Term of the Cash Tender Offer to Acquire 100% of OHL Mexico’s Public Shares to July 26th, 2017 – Reduction of Minimum Percentage of Acquisition from 95% to 85%

Mexico City, July 10, 2017 – OHL Mexico S.A.B de C.V. (“OHL Mexico”) (BMV: OHLMEX) has been notified by Magenta Infraestructura, S.L., (the “Offeror”), that on the same date hereof, the CNBV has authorized the publication of, among others, a notice for information purposes (the “Notice for Information Purposes”), whereby the Offeror announced a modification to the offer launched over the public shares of OHL México (the “Offer”), as mentioned in the Relevant Event published this morning.

In view of the foregoing: (A) the Minimum Percentage of Acquisition set forth in the Offering Memorandum of the Offer was reduced from 95% to 85%; and (B) the term was extended for a period of 5 (five) business days, and thus, the following dates have been extended (1) the maturity date of the Offer to July 26, 2017; (2) the date on which the result of the Offer will be published to July 27,2017; (3) the registry date before the BMV to August 1, 2017; and (4) the settlement date of the Offer to August 4, 2017.

Except for the aforementioned modifications, the terms and conditions of the Offer remain unchanged as set out in the Offering Memorandum of the Offer, which in our understanding will not be amended because of the modification and extension of the term of the Offer mentioned above.

The Offering Memorandum of the Offer, the Offer Notice of the Offer and the Notice for Information Purposes may be consulted on the webpage of the BMV, www.bmv.com.mx, the webpage of the CNBV, www.gob.mx/cnbv, and the webpage of the Issuer, www.ohlmexico.com.mx”