Ecopetrol : Results of the Fourth Auction of the Program to Transfer Ecopetrol’s Equity Interest in Empresa de Energía de Bogota S.A. E.S.P (EEB)

Ecopetrol S.A. (BVC: ECOPETROL; NYSE: EC) ("Ecopetrol" or the "Company") hereby reports today's results of the fourth auction corresponding to Stage Two of the Program to Transfer and Award its 28,465,035 shares of Empresa de Energía de Bogotá S.A. E.S.P.. The bidding session was declared void.

The documentation concerning the offer (available only in Spanish) can be found on Ecopetrol´s website www.ecopetrol.com.co, under the following link:

http://www.ecopetrol.com.co/wps/portal/es/ecopetrol-web/relacion-inversionistas/para-el- accionista/Enajenacion-adjudicacion-acciones-ISA

This announcement is not an offer of securities for sale in the United States. Securities may not be offered or sold in the United States absent registration under the U.S. Securities Act of 1933, or an exemption from registration. No public offering of securities has been or will be made in the United States and, accordingly, the securities will not be registered under the U.S. Securities Act of 1933. This announcement is being issued pursuant to Rule 135e of the U.S. Securities Act of 1933.

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This release contains statements that may be considered forward looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933 and Section 21E of the U.S. Securities Exchange Act of 1934. All forward-looking statements, whether made in this release or in future filings or press releases or orally, address matters that involve risks and uncertainties, including in respect of the Company's prospects for growth and its ongoing access to capital to fund the Company's business plan, among others. Consequently, changes in the following factors, among others, could cause actual results to differ materially from those included in the forward- looking statements: market prices of oil & gas, our exploration and production activities, market conditions, applicable regulations, the exchange rate, the Company's competitiveness and the performance of Colombia's economy and industry, to mention a few. We do not intend, and do not assume any obligation to update these forward-looking statements.

María Catalina Escobar Phone: (+571) 234 5190

E-mail: investors@ecopetrol.com.co

Jorge Mauricio Tellez Phone: (+571) 234 4329

E-mail: mauricio.tellez@ecopetrol.com.co