Ronaldo Batista Assuncao

Petrobras Argentina SA engages in the development and exploration of oil and gas properties. It operates through the following business segments: Generation, Distribution of Energy, Oil and Gas, Refining and Distribution, Petrochemicals, and Holding and Other Business. The Generation segment engages in generation through the following businesses: Central Térmica Genelba, Central Térmica Loma la Lata, Central Térmica Ingeniero White, Central Térmica Güemes, Central Térmica Piquirenda, Central Térmica Parque Pilar, EcoEnergía, Hidroeléctrica Nihuiles and Hidroeléctrica Diamante, HPPL, Corti, Pampa Energia WPP and De la Bahi WPP, and Enecor. The Distribution of Energy segment engages in the electricity distribution through its subsidiary Edenor. The Oil and Gas segment engages in oil and gas business directly through its investments in Oleoductos del Valle S.A. The Refining and Distribution segment engages in the refining and distribution business through its storage facility in Dock-Sud and Refinor. The Petrochemicals segment operates through its styrenics operations and the catalytic reformer operations conducted in its Argentine plants. The Holding and Other Business segment holds interest in Petrobras Hispano Argentina S.A and Transener. The company was founded in 1946 and is headquartered in Buenos Aires, Argentina.

Petrobras Energía Internacional SA operates as an investment holding company. The company was founded on November 14, 2000 and is headquartered in Buenos Aires, Argentina.

Petrolera Entre Lomas SA is a hydrocarbons exploration and exploitation Company. It is engaged in the production of Oil and Gas in Cuenca Neuquina. The company was founded in 1968 and is headquartered in Río Negro, Argentina.

Petrobras Hispano Argentina SA engages in the exploration and production of oil and gas. The company was founded on December 15, 2000 and is headquartered in Madrid, Spain.

Part of ConocoPhillips, Atalaya Energy SA is an Argentinean company that explores for, produces, and develops oil and gas properties. The company is based in Vicente Lopez, Argentina. Atalaya Energy was acquired by Burlington Resources Canada Ltd., part of ConocoPhillips from December 11, 2001 on September 10, 2001 for $13.37 million.