Graña Y Montero Enters into New Construction Contract with Transportadora de Gas del Peru

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, informed that on September 16, through a consortium denominated Construcciones y Montajes – CCM, in which its subsidiary GyM S.A. has a 40.0% participation, it has entered into a contract with Transportadora de Gas del Peru S.A. for the supply of equipment and materials, construction and assembly of the Natural Gas Compression Plant KP 127.

The amount of the contract is US$ 131,889,769.00 and will be executed in 26 months and 15 days.

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 company specialized in providing services to the energy, oil and gas, cellulose and mining sector in Chile and Latin America; 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 Montero S.A.A.Juan Jose Arrieta, 511-213-6598Corporate Communications& Social Responsibility [e-mail] Gray F., 511-213-6583Investor Relations [e-mail]@gym.com.pe