PETRO RIO S.A. ADR /1

PRIO SA is a holding company, which engages in the exploration and production of oil and natural gas through its subsidiaries. It holds interest in other companies as partner, shareholder, or quotaholder, in Brazil and abroad. Its projects include the Polvo Field, Tubarao Martelo Field, Frade Field, Wahoo Field, Albacora Leste Field and Peregrino Field. The company was founded by Marcio Rocha Mello on October 13, 2008 and is headquartered in Rio de Janeiro, Brazil.