UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER
PURSUANT TO RULE 13a-16 OR 15b-16 OF
THE SECURITIES EXCHANGE ACT OF 1934

For the month of November 2015

Commission File Number 001-35591

GRAÑA Y MONTERO S.A.A.

(Exact name of registrant as specified in its charter)

GRAÑA Y MONTERO GROUP

(Translation of registrant’s name into English)

Republic of Peru

(Jurisdiction of incorporation or organization)

Avenida Paseo de la República 4667, Lima 34,

Surquillo, Lima

Peru

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F:

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): [ ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): [ ]

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): Not applicable.

Hereby, we make reference to the Relevant Information Communication we presented on September 29, 2015 where we informed about the signing of an addendum to a Memorandum of Understanding in which the incorporation of Graña y Montero through its subsidiaries was agreed, with a participation of 20% in the Concesionaria del Gasoducto Sur Peruano, as well as with 29% in the construction consortium of the aforementioned project.

Such is the case that today, our subsidiary Negocios de Gas S.A., has participated in the Gasoducto del Sur Peruano S.A. General Shareholders’ Meeting subscribing an initial capital contribution of US$ 118’036,051.00 as part of the required approximate investment of US$ 215,000,000.00. With this investment, we acquire a 20% participation of the shareholder equity of Gasoducto Sur Peruano S.A, which is the concessionaire of the “Improvements to the country’s energy safety and development of the Southern Gas Pipeline Project”. Moreover, our subsidiary GyM S.A. has signed an addendum to the constitution contract of the construction consortium, for its incorporation with a participation of 29%.

In this regard, our participation in the Southern Gas Pipeline project is now formalized ratifying our strategy of being the Peruvian partner of choice in the major infrastructure projects in the country.

/s/ Dennis Gray Febres
Stock Market Representative
Graña y Montero S.A.A.

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.