Press Room Annual Report Annual Report 2009 Annual Report 2009 Annual Report 2007 Annual Report 2006 Annual Report 2005 Annual Report 2004 Press Release 2010 Ecopetrol announces results for the Second Quarter and First Half of 2010 Ecopetrol´ s outlook upgraded from Stable to Positive by Standard & Poor´s Ecopetrol files its 2009 Annual Report on Form 20-F Ecopetrol S.A. extends its Strategic Plan until 2020 Peruvian Government approves the admission of Ecopetrol del Peru S.A. to Lot 117 in the Maranon Basin Ecopetrol takes over Cupiagua operations INCO grants Ecopetrol S.A. a 20-Year Port Concession at Pozos Colorados Maritime Terminal Ecopetrol submits highest bids for 9 blocks in Open Round Colombia 2010 The Castilla Field Reached a Record Production of 100,000 Barrels of Crude per Day Ecopetrol approves request to expand the commercial surface of the rubiales field Ecopetrol clarifies press reports concerning commencement of procedures to access Colombia's public securities market Ecopetrol hits record exports Standard & Poor's reaffirms the corporate risk rating for Ecopetrol S.A. Ecopetrol presents its results for the first quarter of 2010 Ecopetrol approves the commercial viability of the Quifa field Ecopetrol Announces Timing for First Quarter 2010 Earnings Release and Webcast Annual General Shareholder's Meeting 2010 Nigeria grants patents to Ecopetrol Ecopetrol announces dates for the first dividend payment and ex-dividend period Ecopetrol announces results of the Company's Annual General Shareholders' Meeting Ecopetrol clarifies information released in the media regarding the construction of an oil pipeline Ecopetrol increases its presence in the Gulf of Mexico (US) Dividend distribution policy for Ecopetrol and ex-dividend period Ecopetrol presents its fourth quarter and full year 2009 results Ecopetrol announces timing for fourth quarter and full year 2009 earnings release and webcast Ecopetrol announces change in accounting methodology for its Statement of Cash Flows Ecopetrol discovers hydrocarbons in the Tempranillo North-1 well Ecopetrol announces its proved reserves as of December 31, 2009 Ecopetrol announces approval of preliminary financing commitment on behalf of the U.S. Export-Import Bank, valued at U.S. $1 billion 2009 Rancho Hermoso-5 well extends the Rancho Hermoso field Ecopetrol S.A. modifies its Corporate Governance Code New Vice President of Supply and Marketing Ecopetrol S.A. announces US$6.93 Billion Investment Plan for 2010 Ecopetrol acquires Participation in Borojó North and Borojó South Offshore Blocks Ecopetrol's ADRs begin trading on the Lima Stock Exchange Ecopetrol Listing on the Lima Stock Exchange Ecopetrol confirms CB&I as leading contractor for Cartagena refinery expansion project Ecopetrol S.A. announces ex dividend period Ecopetrol S.A. received a communication from the colombian Ministry of Finance Ecopetrol Take over operations of the Cupiagua fields beginning july 2010 Details of pooled portfolios using the name Ecopetrol Ecopetrol will continue to assume the administrative and custodial costs associated with its shares on the colombian stock market Pacific Rubiales announced operational update at Quifa Block Ecopetrol S.A. announces Refineria de Cartagena´s modernization Project Ecopetrol presents its third quarter results 2009 Ecopetrol announces timing for Third Quarter 2009 Earnings Release and Webcast New Vice President of Strategy Appointments at Ecopetrol Ecopetrol received communication from the Ministry of Finance Ecopetrol S.A. Announces Delivery and NYSE Listing of its Registered 7.625% Notes Due 2019 Progress in Drilling and Testing Operations at the Quifa Block Ecopetrol S.A. Announces Exchange Offer Results Ecopetrol S.A. Notes Exchange Offer and Identification Codes Hydrocarbon expectations at Quifa-7 well Pacific Rubiales reports updated reserves of Rubiales and Pirirí fields Ecopetrol S.A. announces Exchange Offer Ecopetrol: Quifa-8 Well Progress Report Ecopetrol and its union, USO, sign five-year collective bargaining agreement Ecopetrol announces amounts of second and third 2009 dividend payments Ecopetrol and worker unions agree to continue negotiation talks Ecopetrol announces results for the second quarter Ecopetrol S.A. Clarifies Information on Reserves and Production from the Rubiales Field Ecopetrol announces terms of international notes due 2019 Ecopetrol clarifies information on its financial results published by the media Ecopetrol announces benchmark transaction of debt securities Ecopetrol S.A. files its 2008 Annual Report on Form 20-F Ecopetrol S.A. transfers assets to its affiliate in Spain Ecopetrol reports final loan terms Ecopetrol and Glencore closed negociation on Reficar S.A. Hocol becomes an affiliate of the Ecopetrol Entrepreneurial Group Ecopetrol enters into loan agreement for COL$2.2 trillion with local banks Ecopetrol will be the new operator of OCENSA Ecopetrol registers its corporate holding situation Ecopetrol Reports its Results for the First Quarter of 2009 First step in the negotiation of new Collective Bargaining Agreement of Ecopetrol S.A. Ecopetrol reports the Gibraltar 3 well drilling results Ecopetrol clarified information published by the media concerning bond issuances Ecopetrol Announces State Council Ruling on Income Tax for Fiscal Year 1996 Ecopetrol and Talisman increase their oil exploratory activity in Peru Ecopetrol and Anadarko signed an agreement for exploration in Brazil Ecopetrol Confirms Oil Discovery at Well in Putumayo Ecopetrol announces results of the company's Annual General Shareholders' Meeting Second call for the Annual General Shareholders' Meeting of Ecopetrol S.A. 2009 Ecopetrol submitted the best proposals for 26 blocks in the Gulf of Mexico (USA) Ecopetrol closed the purchase of Enbridge shares in Ocensa Ecopetrol and Petrobras reached agreements for exploration and production in Perú Ecopetrol S.A. agrees to acquire Enbridge's share in OCENSA Agreement on Acquisition of Hocol Colombia by Ecopetrol S.A Progress in negotiations between Ecopetrol and Glencore in regards to the Cartagena refinery Dividend distribution project for Ecopetrol S.A. and Ex-dividend period Ecopetrol clarifies state of conversations with Glencore Ecopetrol Reports Fourth Quarter and Full Year 2008 Results Ecopetrol Reschedules Release Date of 4th Quarter 2008 results for February 17 Ecopetrol and KNOC acquire Petro-Tech Ecopetrol increases its Participation in Fuerte Norte and Fuerte Sur Offshore Blocks Amendments to the Corporate Governance Code at Ecopetrol Ecopetrol reports oil-producing well in the department of Meta 2008 Ecopetrol and StatoilHydro enter into an agreement for exploration activities in the Gulf of Mexico (USA) Ecopetrol announces an investment plan of US$6.2 billion for 2009 Ecopetrol submits the most competitive bids for 4 blocks in the ANH 2008 Mini Round Evidence of hydrocarbons in the quifa-5 well Comments by Ecopetrol on legal procedure initiated by Llanos Oil Duff & Phelps de Colombia S.A. rated Ecopetrol S.A.'s corporate debt as AAA Ecopetrol and BP will conduct joint exploration work in the Gulf of Mexico Ecopetrol and Eni will drill 5 prospects in the USA Gulf of Mexico Ecopetrol enters into ethanol market Ecopetrol Lists American Depositary Shares on the New York Stock Exchange Ecopetrol participates in heavy crude round Ecopetrol presents highest offer for four blocks in Colombia Round Ecopetrol's third quarter 2008 results Laboratory certifies the quality of the diesel distributed by Ecopetrol Quality Certificates for Ecopetrol Agreement between Ecopetrol and Pacific Rubiales to explore the Alicante block Ecopetrol discovers hydrocarbons in the Tempranillo-1 well Ecopetrol closed transaction to acquire Propilco Ecopetrol's net earnings grew 174% in the first quarter of 2008 Partial Commutation Authorized for Ecopetrol's Pension Liabilities Production starts at the Pacandé Sur 2 development well Results from the drilling of the Balcón 22 development well Ecopetrol signed six exploration agreements in Brazil Profit Distribution Starting in July, the Colombian diesel will have less than 500 parts per million Ecopetrol improves the quality of diesel in Bogotá Ecopetrol S.A.' exports of oil and derivates Tenax-1 Well yields crude and gas production in preliminary tests 2007 Ecopetrol defines agreement to acquire Propilco Ecopetrol supports the Colombian education Ecopetrol conducts deep-water exploration in the Gulf of Mexico - United States Ecopetrol, present in Brazil with six blocks Ecopetrol confirms exploration agreements for 9 blocks in Peru $5.000 million to improve educational services in areas influenced by the oil industry Ecopetrol and Petro Rubiales agree to the construction of a pipeline in the Colombian Plainlands (Llanos) Ecopetrol, committed to the quality of fuels Over 480 thousand Colombians are now Ecopetrol shareholders Biodiesel reaches Transmilenio Ecopetrol participates in eight exploration blocks in the Ronda Caribe 2007 $1.400.000 minimum stock package of Ecopetrol shares $1.400.000 minimum stock package of Ecopetrol shares Ecopetrol and Shell close an alliance to explore the Colombian Plainlands Ecopetrol and Shell close an alliance to explore the Colombian Plainlands Ecopetrol explores in the deep water US Gulf. Ecopetrol launches its new brand Ecopetrol, Pdvsa and Chevron sign an agreement for gas interconnection 200 thousand gas-powered vehicles operating in Colombia Ecopetrol and Talisman get exploration block in Peru The Birth of Ecodiesel Colombia S.A. Alliance between Ecopetrol and Petroperu Ecopetrol will resume operations in Gibraltar Extensive testing in Condor 2007 Record figures for Ecopetrol in 2006 2006 Plan to improve the quality of fuels Tibú Field: Ecopetrol & Petrobras will develop it Javier Gutiérrez: New President Ecopetrol to operate exploratory block in Brasil Exports record 23 Million Dolars in Barrancabermeja Plant Partnership between Ecopetrol and Petrobras for development of biofuels Glencore and Petrobras after the Cartagena Refinery A Press Release from Colombian Government COP$826 Billion in profits Ecopetrol reported Col$3.25 trillion profits Four investors prequalified for PMD Project Triple A: The rating of Ecopetrol S.A. Colombia topped 100,000 vehicles converted PMD Closed Bids Process starts 2005 Ecopetrol doubles investments to increase production in Huila The Gobernor and the UIS to decorate the ICP Rebirth of La Cira - Infantas Ecopetrol made some 700 million dollars in the first semester of 2005 Carta Petrolera (Petroleum Newsletter) January - March 2010 September - October 2008 August - September 2008 January - February 2008 July - August 2007 October - November 2006 April - May 2006 December 2005- February 2006 September-October 2005 May-June 2005 October - November 2004 July - August 2004 Sustainability Report Sustainability Report 2009 Social Responsability Report 2008 Social Responsability Report 2007 Social Responsability Report 2006 Social Responsability Report 2005-2006 Other Publications Brouchure CT&F - Science Technology & Future Ecopetrol announces results for the Second Quarter and First Half of 2010 Ecopetrol announced today its unaudited unconsolidated and consolidated financial results for the second quarter and first half of 2010. The net income for the second quarter of 2010 of COL$1.8 trillion with a 136.8% increase over the second quarter of 2009. See complete report. Ecopetrol´ s outlook upgraded from Stable to Positive by Standard & Poor´s Ecopetrol S.A.announced that the risk-rating agency Standard & Poor´s released a report on July 9, 2010, upgrading the outlook on the Company from stable to positive, while affirming the Company´s corporate risk rating ´BB+´. Ecopetrol S.A. extends its Strategic Plan until 2020 The Board of Directors of Ecopetrol S.A. approved the 2011-2020 strategic plan for the companies comprising the Ecopetrol Corporate Group. The 2011-2020 strategic plan for the Ecopetrol Corporate Group was prepared from the perspective of new business targets, with a focus on sustainable development and a clear market orientation, resulting in profit-linked value goals. Ecopetrol takes over Cupiagua operations Ecopetrol S.A. will assume direct operation of the Cupiagua and Cupiagua Sur fields as of midnight, June 30. The fields are located in the municipality of Aguazul in the Casanare province, a major prospect region in Colombia. Indicators WTI Crude NYMEX 30/07/2010 USD / Barrel 78,95 ADR - Ecopetrol 30/07/2010 US$ 34,12

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