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 April,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.

April 21, 2026

Medellin, Colombia

GRUPO CIBEST S.A. INFORMS CHANGES IN THE COMPOSITION OF ITS RISK COMMITTEE

Grupo Cibest S.A. (“Grupo Cibest”) informs that its Board of Directors approved changes in the composition of the members of its Risk Committee.

As a result of the foregoing, the Risk Committee will be composed of the following members:

Risk Committee

iiscAndrés Felipe Mejía Cardona

iiscSilvina Vatnick

iiscNicolás Zapata Zuluaga

The other committees of the Board of Directors did not undergo any changes and continue to have the same members reported to the market on the 6-K dated June 18, 2025, as follows:

Audit Committe

iiscSilvina Vatnick

iiscAndrés Felipe Mejía Cardona

iiscNicolás Zapata Zuluaga

Good Governance Committee

iiscLuis Fernando Restrepo Echavarría

iiscSylvia Escovar Gómez

iiscSilvina Vatnick

Designation, Compensation and Development Committee

iiscSylvia Escovar Gómez

iiscLuis Fernando Restrepo Echavarría

iiscRicardo Jaramillo Mejía

The biography of the Directors can be accessed at this link: https://www.grupocibest.com/corporate/corporate-governance/board-of-directors-and-senior-management

Contacts