EC 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 September, 2024

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

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: September 3, 2024

Decisions of the Board of Directors of Ecopetrol S.A.

Ecopetrol S.A. (BVC: ECOPETROL; NYSE: EC) (“Ecopetrol” or the "Company") announces that the directors Juan José Echavarría and Luis Alberto Zuleta presented their resignations as independent members of the Company's Board of Directors, in the terms of the communication that the media previously released to the public. This resignation was presented and made known to the Board of Directors on August 30, 2024. This resignation will become effective on the date that the minutes of the previous meetings of the Board of Directors and Support Committees in which they participated are approved.

The Company informs that the content of the following resignation letter corresponds exclusively to the opinions of the directors Juan José Echavarría and Luis Alberto Zuleta. Below is a convenience translation of their resignation letter:

“[Convenience Translation]

Bogota, August 30^th^, 2024

Sirs.

Ecopetrol S.A.

Attn. Board of Directors

Attn. Ricardo Roa, CEO of Ecopetrol

Attn. German Gonzalez, General Secretary, Ecopetrol

Attn. Nation – Ministry of Finance

Attn. Andres Velazco – President of Asofondos

Resignation from Ecopetrol's Board of Directors

After extensive deliberations, in February 2024,the Business and Audit Committees from Ecopetrol unanimously recommended to the Board of Directors that the company pursue the activitiesrelated to the acquisition of an amount between 20% and 30% of the assets of the Crownrock Project, owned by Occidental Petroleum Company(Oxy) in the Permian Basin in the United States.

The approval of this project considered the favorableimpact it would have on the company's net income, production, and reserves, and highlighted its minimal environmental impacts. It wasnoted that the level of indebtedness was considerable but manageable. In May 2024, the Board of Directors approved, by majority vote (sevenin favor and two against), the acquisition of 30% of this project, and on July 17th, it was announced to the market that negotiationswith Oxy were underway.

In the afternoon of July 31^st^, 2024,we were informed that during an informal meeting in Piedecuesta, Bucaramanga, President Gustavo Petro expressed to Ricardo Roa and variousmembers of the Board his disagreement with the project for three main reasons: it involved investment in fracking, it would increase Ecopetrol'sleverage, and it meant directing resources from Colombia abroad. The Board then decided, by majority, not to proceed with the deal (ourvote remained in favor, of course). Furthermore, it was considered impossible to execute the project without the Government's support.July 31^st^ was the last day to communicate our decision to Oxy without incurring in any penalties.

We believe that the project was essential to protectthe future of Ecopetrol and its more than 250,000 shareholders, for the reasons outlined in this document, and its rejection motivatesour resignation from the Board of Directors of Ecopetrol S.A.

Without the resources that the project would providein the future, Ecopetrol's finances will deteriorate, and the transfers to the National Government will be reduced. Ecopetrol currentlycontributes approximately 4 points of the GDP to the Nation through taxes, investment, royalties, and dividends—an amount equivalentto the Government's total spending on education, 1.5 times retirement expenses, and 2.1 times the healthcare expenditure. It contributesbetween 10% and 15% of the Nation's total revenues each year. The lack of contribution from Ecopetrol and the Oslo project will come outof the pockets of the Colombian citizens. Ecopetrol produces 80% of the natural gas used by more than 10 million consumers.

This resignation will become effective once wehave the opportunity to approve the minutes of the previous Board of Directors meetings, which we hope will be provided to us for approvalwithin the next month from the date of this notice.

We kindly request that, in compliance with applicablelaw, and given that these decisions have an evident material impact, this communication be released as relevant information.”

The Board of Directors will continue to be comprised of its other members, in accordance with current and applicable regulations.

Bogota D.C., August 30, 2024

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 (a)

Lina María Contreras Mora

Email: [email protected]

Head of Corporate Communications

Marcela Ulloa

Email: [email protected]