UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549   FORM 20-F/A   Amendment
No. 1  ☐
REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR  ☒
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR  ☐
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 OR  ☐
SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of event requiring this shell company report For
the transition period from  to Commission file number 001-35991   GRAÑA Y MONTERO S.A.A. (Exact name of Registrant as specified in its charter)   N/A (Translation of Registrants name into English) Republic of Peru (Jurisdiction of incorporation or organization) Av. Paseo de la República 4667 Surquillo Lima 34, Peru (Address of principal executive offices) Daniel Urbina Pérez, Chief Legal Officer Tel.
011-51-1-213-6565 relacion.inversionistas@gym.com.pe Av. Paseo de la República 4667 Surquillo Lima 34, Peru (Name, telephone, e-mail and/or facsimile number and address of company contact person) Securities registered pursuant to Section 12(b) of the Act:  Title of each class

Trading
Symbol

Name of each exchange
on which registeredCommon Shares, par value s/1.00 per share,American Depositary Shares, each representing five Common Shares

GRAM

New York Stock Exchange*New York Stock Exchange    *
Not for trading purposes, but only in connection with the registration on the New York Stock Exchange of the
American Depositary Shares representing those common shares. Securities registered pursuant to Section 12(g) of
the Act: None Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None   Indicate the number of
outstanding shares of each of the issuers classes of capital or common stock as of the close of the period covered by the annual report:  At December 31, 2019

871,917,855 shares of common stock Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities
Act.    Yes  ☐    No  ☒ If this report is an annual or transition report,
indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.    Yes  ☐    No  ☒ Note  Checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange
Act of 1934 from their obligations under those Sections. Indicate by check mark whether the Registrant (1) has filed all reports required to be
filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for
the past 90 days.    Yes  ☐    No  ☒ Indicate by check mark whether the
Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such
shorter period that the Registrant was required to submit such files).    Yes  ☒    No  ☐ Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated
filer, or an emerging growth company. See definitions of large accelerated filer, accelerated filer, and emerging growth company in Rule 12b-2 of the Exchange Act. (Check
one):  Large accelerated filer  ☐

Accelerated filer  ☒

Non-accelerated filer  ☐

Emerging growth company  ☐ If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if
the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting
standards provided pursuant to Section 13(a) of the Exchange Act.    ☐  
The term new or revised financial accounting standard refers to any update issued by the Financial
Accounting Standards Board to its Accounting Standards Codification after April 5, 2012. Indicate by check mark whether the
registrant has filed a report on and attestation to its managements assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered
public accounting firm that prepared or issued its audit report.    ☒ Indicate by check mark which basis of accounting the
Registrant has used to prepare the financial statements included in this filing:  U.S. GAAP   ☐



International Financial Reporting Standards as issued
by the International Accounting Standards Board  ☒

Other   ☐ If Other has been checked in response to the previous question, indicate by check mark which financial statement
item the Registrant has elected to follow. Item 17  ☐    Item 18  ☐ If this is an annual report,
indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒




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Explanatory Note This Amendment No. 1 to Form 20-F (this Amendment) is being filed to amend the annual report on Form 20-F for the fiscal year ended December 31, 2019 filed by Graña y Montero S.A.A. on June 15, 2020. The company is filing this Amendment solely to add disclosure that, in making the
original filing, the company relied on the order of the U.S. Securities and Exchange Commission (the SEC) dated March 4, 2020 (Release No. 34-88318), as modified on March 25, 2020
(Release No. 34-88465), for an extension of the original due date. The company made the original filing on June 15, 2020, within 45 days after the original due date, as permitted under the order. The
disclosure under the heading Reliance on SEC Order below is hereby added as an explanatory note at the beginning of Part I. Introduction of the original filing. In addition, as required by SEC rules, certifications by the companys principal executive officer and principal financial officer are filed as exhibits
to this Amendment under Item 19 hereof. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Item 15. Controls and Procedures, paragraphs 3, 4 and 5 of the
certifications have been omitted. We are not including the certifications under Section 906 of the Sarbanes-Oxley Act of 2002 as no financial statements are being filed with this Amendment. Other than as expressly set forth herein, this Amendment does not, and does not purport to, amend, update or restate the information in the original filing or
reflect any events that have occurred after the original filing was made. Information not affected by this Amendment remains unchanged and reflects the disclosures made at the time the original filing was made and no changes have been made to the
financial statements of the company as contained in the original filing. Accordingly, this Amendment should be read in conjunction with the original filing and the companys other filings with the SEC. Reliance on SEC Order As previously disclosed on a Form 6-K furnished by the company on April 30, 2020, the company required additional time to file this annual report due to circumstances related to the COVID-19 pandemic. On March 15, 2020, due to the outbreak of the COVID-19 pandemic, the Peruvian government declared a national
state of emergency and enacted a mandatory quarantine, beginning March 16, 2020. The government closed all international borders and suspended all travel within Peru. The state of emergency also prohibits large gatherings, institutes a curfew,
and limits the use of private vehicles, among other limitations. As of the date of this annual report, these Peruvian government measures remain in effect until June 30, 2020, and persons in
non-compliance may face fines or detention. The extraordinary government measures have limited access to our facilities by executives, support staff and professional advisors. In addition, since early March
2020, management of the company has been focused on assessing and overcoming the unprecedented challenges posed by the COVID-19 pandemic and the extraordinary government measures for the companys
business and stakeholders. These factors resulted in a delay in the preparation of this annual report, including the completion of the companys audited consolidated financial statements for the 2019 year.




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ITEM 19.
EXHIBITS  ExhibitNumber

Description12.01

Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act12.02

Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act




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SIGNATURES The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that
it has duly caused and authorized the undersigned to sign this Amendment to the annual report on Form 20-F on its behalf.  GRAÑA Y MONTERO S.A.A.By:

/s/ Luis Francisco Díaz OliveroName:

Luis Francisco Díaz OliveroTitle:

Chief Executive OfficerBy:

/s/ Monica MiloslavichName:

Monica MiloslavichTitle:

Chief Financial Officer
 Date: June 22, 2020