6-K

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 November, 2025

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)

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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.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: November 11, 2025

Ecopetrol Announces Changes in Senior Management

Ecopetrol S.A. (BVC: ECOPETROL; NYSE: EC) announces that the Board of Directors appointed the following leadership positions , during its meeting on November 11, 2025, all of which will be effective as of November 16:

Juan Carlos Hurtado Parra as Executive Vice President of Hydrocarbons. Mr. Hurtado, who previously served as Vice President of Exploration, Development, and Production, holds a degree in Electrical Engineering from Universidad Industrial de Santander, a specialization in project evaluation and development from Universidad del Rosario, and a Master of Business Administration in Oil & Gas Management from the University of Dundee. He brings over 25 years of experience in the oil, gas, and energy sector, including approximately 23 years at Ecopetrol S.A., where he has held key positions such as Vice President Upstream, Vice President of Subsidiaries and Joint Ventures, and Technical Vice President, among others.

Rafael Ernesto Guzmán Ayala, will take on new professional challenges within the Ecopetrol Group. Mr. Guzmán has previously served as Executive Vice President of Hydrocarbons. The company extends its gratitude to Mr. Guzmán for his years of service, leadership, and strategic contributions in the Executive Vice Presidency of Hydrocarbons.

Rodolfo Mario García Paredes as Chief Compliance Officerand Compliance Officer. Mr. García is an attorney from Universidad del Rosario with a specialization in public management and administrative institutions from Universidad de los Andes. He has been acting in this role since June 2025. Additionally, he has served in Ecopetrol’s Corporate Legal Vice Presidency and General Secretariat for over 25 years, during which he has held leadership positions such as Legal Manager of Hydrocarbons, Legal Advisory Manager for Exploration, and Legal Manager for New Businesses and Corporate Affairs. He has previously acted as head of the Corporate Legal Vice Presidency and the General Secretariat.

The Ecopetrol Group wishes the appointed leaders great success in their new roles.

Bogota D.C., November 11, 2025

Ecopetrol is the largest companyin Colombia and one of the main integrated energy companies in the American continent, with more than 19,000 employees. In Colombia, itis responsible for more than 60% of the hydrocarbon production of most transportation, logistics, and hydrocarbon refining systems, andit holds leading positions in the petrochemicals and gas distribution segments. With the acquisition of 51.4% of ISA’s shares, thecompany participates in energy transmission, the management of real-time systems (XM), and the Barranquilla - Cartagena coastal highwayconcession. At the international level, Ecopetrol has a stake in strategic basins in the American continent, with Drilling and Explorationoperations in the United States (Permian basin and the Gulf of Mexico), Brazil, and, through ISA and its subsidiaries, Ecopetrol holdsleading positions in the power transmission business in Brazil, Chile, Peru, and Bolivia, road concessions in Chile, and the telecommunicationssector.

For more information, please contact:

Head of Capital Markets

Carolina Tovar Aragón

Email: [email protected]

Head of Corporate Communications

Marcela Ulloa

Email: [email protected]