Buenos Aires, August 17 2011.

Messrs.

ARGENTINE SECURITIES COMMISSION

Ref.: Relevant Event

Dear Sirs,

We are writing to you in order to inform that on day date, we have been reported by the Central Bank of Artgentina about the Board of Directors´s Resolution N° 139 dated on

08.11.11, in which it decided not to comment to the Sir. Juan Domingo Mazzón, to perform

as regular director.

Because of this approval, we attached the List of Authorities duly updated.

Yours very truly,

Guillermo F. Pedró

Head of

Market Relations

BANCO PATAGONIA S.A.