Petro Rio S.A. (“PetroRio” or the “Company”), the new corporate name of HRT Participações em Petróleo S.A. as approved in a Special Shareholders Meeting held on May 15, 2015, today announced that the corporate name has now been formally changed. As of June 26, 2015, its common shares will begin trading on the São Paulo Stock Exchange, the BM&FBOVESPA S.A. Bolsa de Valores, Mercadorias e Futuros under the name PETRORIO and ticker symbol PRIO3.

The Company´s Global Depositary Shares (“GDS”), listed on the TSX Venture Exchange (“TSXV”) in Canada, are expected to start trading under the name PETRORIO and ticker symbol PRJ on completion of filings with the TSXV.

PetroRio was established with a dynamic new corporate culture focused on increasing production through the acquisition of production assets, the re-exploration of existing assets, the ongoing incorporation of operational efficiencies and improvements, the reduction of production costs and corporate expenses, as well as the mitigation of exploration risk. PetroRio´s main objective is to create value for its shareholders, with increasing financial discipline and preserving its liquidity, strengthening its position to develop as a large oil company in Brazil.

For further information, please contact PetroRio’s Investor Relations Department.

About PetroRio

PetroRio, through its subsidiaries, holds a 60% participating interest and it is also the operator of the Polvo Field, which is located in the southern portion of the Campos Basin, at 100km east of the city of Cabo Frio, Rio de Janeiro. PetroRio has Brazil's seventh largest daily production of barrels of oil equivalent (boe), with 20.3º API, deriving from three producing reservoirs. PetroRio is the owner, through its subsidiaries, of "Polvo A" fixed platform and a 3.000HP drilling rig, currently in operation in the field, being the platform connected to the "Polvo FPSO" vessel, with capacity to segregate hydrocarbons and water treatment, oil storage and offloading. Polvo Field license covers an area of approximately 134km2, with several prospects with potential for further explorations.

In January 2015, PetroRio announced the proposed acquisition of the Bijupira and Salema Fields located at the same basin, Campos Basin, at a distance of approximately 80 km from the Polvo Field, tripling its current daily production to more than 33,000 barrels of oil. Such acquisition is subject to the approval of Brazil’s National Agency of Petroleum, Natural Gas and Biofuels (ANP). Furthermore, PetroRio is born of a new corporate culture focused on increasing production through the acquisition of production assets, the re-exploration and optimization of the Polvo, Bijupirá and Salema Fields, increasing operational efficiency and reducing production costs and corporate expenses. The Company’s main objective is to create value for its shareholders, protecting its liquidity and increasing revenue and profits, with full respect for safety and the environment.

For more information, please visit the Company's website: www.petroriosa.com.br.