Its many business interests include the construction of buildings and infrastructure, the energy and mining industries, and sanitation and highway services.

[9] [10] On December 22, 2017, the ad hoc Attorney for the Odebrecht case requested before the Judiciary that Graña y Montero be included in the investigation against former president Alejandro Toledo, because his partner in the Odebrecht project confessed to having made improper payments for US$20 million in exchange for obtaining the good offer in the tender for sections 2 and 3 of the Interoceanic highway.

[15] Jorge Barata stated that Graña y Montero paid 3 million dollars as a bribe for the award of the work; the company's management declared that it had no knowledge to corroborate or deny that information.

[17] The mayor of Lima, Jorge Muñoz, declared that the company was no longer going to execute the Vía Expresa Sur project due to this background.

[18] The Comptroller General of the Republic has calculated the cost overrun of this work executed by the Electric Train Consortium at 400 million dollars.