Co-Issuance of U$S 250,000,000 Private Notes by Rio Energy S.A., UGEN S.A. and UENSA S.A. in the International Market

Legal counsel to Rio Energy S.A., UGEN S.A. y UENSA S.A, as Co-Issuers, in the co-issuance of Secured Floating Rate Private Notes worth U$S 250,000,000, due in 2023.

Pursuant to the Note Issuance Facility Agreement, J.P. Morgan Securities LLC acted as arranger; Citibank N.A. acted as notes agent, paying agent and registrar, and La Sucursal de Citibank, N.A., established in the Republic of Argentina, acted as collateral agent and trustee.