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 OF

THE SECURITIES EXCHANGE ACT OF 1934

For the month of June, 2026

Commission File Number 001-42656

Grupo Cibest S.A.

(Translation of registrant’s name into English)

Cra. 48 # 26-85

Medellín, Colombia

(Address of principal executive offices)

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 þ	Form 40-F o
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SIGNATURE

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.

June 25, 2026

Medellin, Colombia

GRUPO CIBEST S.A. ANNOUNCES BOARD OF DIRECTORS RESOLUTION

The Board of Directors of Grupo Cibest S.A. (“Grupo Cibest”) unanimously authorized Luis Fernando Restrepo Echavarría, Chairman of the Board of Directors of Grupo Cibest, to partially settle his rights in the SVA Institutional Fund (the “SVA Fund”) managed by Protección S.A., whose investment is primarily in shares of Grupo Cibest. The authorization was granted with the favorable vote of all directors, with the abstention of Luis Fernando Restrepo Echavarría.

In carrying out these transactions, the procedure established in the Good Governance Code of Grupo Cibest for the settlement of contributions to the SVA Fund by administrators has been complied with.

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