Company: CIB
Filing Date: 2025-07-23
Form Type: 6-K
Source: 0002058897-25-000026
Chunk: 0

Company: Grupo Cibest S.A.
Filing Date: 2025-07-23
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 July, 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 July, 23, 2025 |     | By:               |     | /s/ MAURICIO BOTERO WOLFF.             |
|                     |     | Name:             |     | Mauricio Botero Wolff                  |
|                     |     | Title:            |     | Vice President of Strategy and Finance |

July 23, 2025

Medellin, Colombia

<div align='center'>GRUPO CIBEST S.A. ANNOUNCES DECISIONS OF ITS BOARD OF DIRECTORS</div>

The Board of Directors of Grupo Cibest S.A. (“Grupo Cibest”) unanimously authorized Rodrigo Prieto Uribe, the company’s Risk Vicepresident to liquidate 63,736 of his units in the institutional investment fund managed by Protección S.A. (“Protección”), whose investment is primarily composed of Grupo Cibest shares.

Relatedly, the Board of Directors unanimously authorized Rodrigo Prieto’s spouse to acquire outstanding shares of Grupo Cibest for an amount equivalent to the proceeds obtained from