Company: CIB
Filing Date: 2025-06-10
Form Type: 6-K
Source: 0002058897-25-000016
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

Medellin, Colombia

<div align='center'>GRUPO CIBEST S.A. ANNOUNCES APPROVAL OF SHARE REPURCHASE PROGRAM</div>

Grupo Cibest S.A. (“Grupo Cibest”) announced that, at today’s Extraordinary General Shareholders’ Meeting, the following decisions were approved with the required majorities :

1. The creation of a reserve for share buybacks.

2. The appropriation of the sum of one trillion three hundred and fifty billion Colombian pesos (COP $1,350,000,000,000) that are part of the legal reserve and, authorize its transfer to the reserve to execute the share buybacks.

3.