Graña y Montero S.A.A. Board of Directors Approve Issuance of Second Tranche of New Common Shares

Graña y Montero S.A.A. (“Graña y Montero” or the “Company”), the recently listed engineering and construction Peruvian company in the New York Stock Exchange, announced that in its Board of Directors Meeting dated August 22, it approved the issuance of the second tranche of new common shares derived from the ADS Initial Public Offering (the “Primary Offering”).

Pursuant to the exercise of the over allotment option granted to the underwriting banks of the Primary Offering, the Company will issue 4’095,180 common shares equivalent to 819,036 ADSs, at a sale price of US$ 21.13 per ADS. As a consequence, the total number of common shares issued for the first and the second tranche of the Primary Offering will be 101’769,600 equivalent to 20’353,920 ADSs.

The new common shares to be issued are initially represented by one or more provisional stock certificates which will be delivered on August 27, 2013 and will then be replaced by definitive certificates on the fifth business day after the Company communicates the registration of the increase of capital in Public Registry.

Finally, the Company’s share capital will increase from S/. 655'958,610.0 to S/. 660'053,790.0.

About Graña y Montero S.A.A.

Founded in 1933, Graña y Montero is the only Peruvian engineering and construction company listed on the Lima Stock Exchange since 1997 and now also the NYSE. The Company has participated in the development of major engineering and construction projects in Peru, including large-scale, complex projects in the energy, mining, construction and real estate sectors.

With 80 years of operations, the Company has leveraged its engineering and construction expertise into complementary lines of business, such as the development, ownership, operation and maintenance of infrastructure assets, real estate developments, and the provision of technical services. The Company has significant investments in infrastructure concessions, such as three toll roads and Line 1 of the Lima Metro.

The Company has also executed several projects outside Perú, and has acquired three companies in Chile: DSD Construcciones y Montajes, an engineering and construction specialized in providing services to the energy, oil and gas, cellulose and mining sector in Chile and Latin America company; Vial y Vives, a construction company specialized in the mining sector, and CAM, which is specialized in electric services, with operations in Chile, Peru and Colombia.

Graña y Montero is listed in the NYSE under ticker symbol “GRAM” and in the Lima Stock Exchange under ticker symbol “GRAMONC1”.

Graña y MonteroJuan Jose ArrietaCorporate Communications & Social Responsibility Officer(511) [e-mail] Gray F.Investor Relations Officer(511) [e-mail]@gym.com.pe