Ecopetrol : Mónica Jiménez González is the new General Secretary of Ecopetrol S.A.

MATERIAL INFORMATION

Ecopetrol S.A. (BVC: ECOPETROL; NYSE: EC) ("Ecopetrol" or the "Company") reports that Mrs. Mónica Jiménez González assumed her functions as the company's new Secretary General.

Mrs. Jiménez is an attorney with a degree from University de los Andes, with more than 15 years of experience in her profession. She is a specialist in Liability and Recoverable Damage from Universidad Externado, and she has a Master's Degree in Science in Development Studies from the London School of Economics and Political Science (LSE), with a scholarship granted by the British Council for academic and professional excellence.

She most recently worked as a legal advisor at Fasken Martineau DuMoulin LLP, Canadian firm where she specialized in international arbitration and corporate social responsibility issues applied to Mining and Oil & Gas.

Previously, she worked at Thomas & Partners Barristers and Solicitors, a Canadian law firm specialized in investment arbitration. Her experience in Colombia was as an attorney advising the Minister and the Vice Minister of Defense in matters of international law, and for the law firm Gómez-Pinzón Zuleta Abogados.

Mrs. Jimenez takes on the process of governance, legal counsel and coordination with the President and the Board of Directors, as well as the coordination of relations with the different control and monitoring entities and the routing of corporate.

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Ecopetrol is the largest company in Colombia and is an integrated oil & gas company; it is among the top 50 oil companies in the world and among the four top ones in Latin America. Besides Colombia - where it generates over 60% of the national production - it has exploration and production activities in Brazil, Peru & the US (Gulf of Mexico). Ecopetrol owns the largest refinery in Colombia and most of the pipeline and multi-product pipeline network in the country, and is significantly increasing its participation in bio-fuels.

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

MATERIAL INFORMATION

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.

Lina María Contreras Mora Phone: (+571) 234 5190

E-mail: investors@ecopetrol.com.co

Jorge Mauricio Tellez Phone: + 571-234-4329

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