Ecopetrol(EC) - 2018 Q4 - Annual Report

As filed with the Securities and Exchange Commission on April 5, 2019 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 Commission file number: 001-34175 ECOPETROL S.A. (Exact name of Registrant as specified in its charter) N/A (Translation of Registrant's name into English) REPUBLIC OF COLOMBIA (Jurisdiction of incorporation or organization) Carrer ...