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 March, 2017

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.

In accordance to what is established by the Regulation for Relevant Information Communications and Reserved Information, we hereby inform you that in line with the Relevant Information Communications released on February 27 and February 28, 2017, the Company has replaced the law firm Smyser, Kaplan & Veselka, LLP for the US law firm Simpson Thacher & Barlett, LLP, as legal counsel to provide legal defense and legal representation in connection to the civil lawsuit filed in the federal courts of the United States of America.

In this regard, it is important to note that the Company has waived its right to receive a formal notice, and this has been made known to the Court of the Federal District of East New York of the United States of America. In that sense, we comply with informing that this class action seeks monetary compensation plus interests for alleged damages caused to plaintiffs. If the claim is granted, the compensation amount would be determined by the Court in the civil proceeding.

Finally, we reiterate our commitment to disseminate the relevant events that are generated in relation to the Graña y Montero Group in a timely manner and before any person or media.

___________________________
/s/ Claudia Drago Morante
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.

GRAÑA Y MONTERO S.A.A.

By: /s/ CLAUDIA DRAGO MORANTE
Name: Claudia Drago Morante
Title: Stock Market Representative
Date: March 14, 2017