Company: CIB
Filing Date: 2025-06-18
Form Type: 6-K
Source: 0002058897-25-000018
Chunk: 0

Company: Grupo Cibest S.A.
Filing Date: 2025-06-18
Form: 6-K
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
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#### FORM 6-K
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### 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, 2025

#### Commission File Number 001-42656
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#### Grupo Cibest S.A.
<div align='center'>(Translation of registrant’s name into English)

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#### Cra. 48 # 26-85

#### Medellín, Colombia
<div align='center'>(Address of principal executive offices)

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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-Fþ |     | Form 40-Fo |

| 1 |

### 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.

|                   |     | Grupo CIBEST S.A. 
 (Registrant)      |     |                                        |
| Date June 18,2025 |     | By:               |     | /s/ MAURICIO BOTERO WOLFF.             |
|                   |     | Name:             |     | Mauricio Botero Wolff                  |
|                   |     | Title:            |     | Vice President of Strategy and Finance |

June 18, 2025

Medellin, Colombia

<div align='center'>GRUPO CIBEST S.A. ANNOUNCES THE ELECTION OF CHAIRMAN AND VICE-CHAIRMAN OF THE BOARD OF DIRECTORS AND THE APPOINTMENT OF THE MEMBERS OF THE SUPPORT COMMITTEES</div>

Grupo Cibest S.A. (“Grupo Cibest”) announced that its Board of Directors has elected Luis Fernando Restrepo Echavarría as Chairman of the Board of Directors, and Ricardo Jaramillo Mejía as Vice Chairman. In addition, it has appointed the members of the Support Committees of the Board of Directors, which are composed as follows:

#### Good Governance Committee
• Luis