EC Ecopetrol SA

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of June, 2016

Commission File Number 001-34175

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  x   Form 40-F  ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1)

Yes  ¨    No  x

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7)

Yes  ¨    No  x

Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  ¨    No  x

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- N/A

Ecopetrol S.A. hereby designates this report on Form 6-K as being incorporated by reference into its registration statement on Form F-3, as filed with the SEC on July 26, 2013 (File No. 333-190198).

Council of Ministers Issues Favorable Opinion on Planned Sale of Ecopetrol S.A.’s Equity Stake in Polipropileno del Caribe S.A.

Ecopetrol S.A. (BVC: ECOPETROL; NYSE: EC) reports that, on June 13, 2016, pursuant to the procedures required by Law 226 of 1995, the Council of Ministers has issued an opinion in favor of the planned sale of Ecopetrol S.A.’s direct and indirect equity stake in Polipropileno del Caribe - Propilco S.A., which was approved by Ecopetrol S.A.’s Board of Directors.

Ecopetrol S.A.'s direct and indirect equity stake in Polipropileno del Caribe - Propilco S.A. amounts to 414,649,961 shares of common stock (equivalent to 100% of the subscribed and paid-up shares). The proceeds from the planned sale will be used to financing Ecopetrol S.A.'s investment plan.

Bogota, June 14, 2016

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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 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.

For further information, please contact:

Head of Corporate Finance and Investor Relations (A)

Lina María Contreras Mora

Phone: (+571) 234 5190

E-mail: investors@ecopetrol.com.co

Media Relations (Colombia)

Jorge Mauricio Tellez

Phone: + 571-234-4329

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

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