Company: CIB
Filing Date: 2025-06-10
Form Type: 6-K
Source: 0002058897-25-000014
Chunk: 0

Company: Grupo Cibest S.A.
Filing Date: 2025-06-10
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, 9, 2025 |     | By:               |     | /s/ MAURICIO BOTERO WOLFF.             |
|                    |     | Name:             |     | Mauricio Botero Wolff                  |
|                    |     | Title:            |     | Vice President of Strategy and Finance |

June 9, 2025

Medellín, Colombia

<div align='center'>GRUPO CIBEST S.A. ANNOUNCES APPOINTMENT OF MEMBERS TO ITS BOARD OF DIRECTORS AND APPROVAL OF THEIR REMUNERATION</div>

Grupo Cibest S.A. (“Grupo Cibest”) announced that today in the Extraordinary General Shareholders’ Meeting, the following members of the Board of Directors were appointed for the period June 2025 – March 2027, with the required majority:

• Ricardo Jaramillo Mejía

• Juan Esteban Toro Valencia

• Andrés Felipe Mejía Cardona

• Nicolás Zapata Zuluaga

• Luis Fernando Rest