Company: CIB
Filing Date: 2025-07-16
Form Type: 6-K
Source: 0002058897-25-000024
Chunk: 0

Company: Grupo Cibest S.A.
Filing Date: 2025-07-16
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, 16,2025 |     | By:               |     | /s/ MAURICIO BOTERO WOLFF.             |
|                    |     | Name:             |     | Mauricio Botero Wolff                  |
|                    |     | Title:            |     | Vice President of Strategy and Finance |

July 16, 2025

Medellin, Colombia

<div align='center'>GRUPO CIBEST S.A. ANNOUNCES COMMENCEMENT DATE FOR ITS SHARE REPURCHASE PROGRAM</div>

Grupo Cibest S.A. (“Grupo Cibest”) announced that, in accordance with the Relevant Information disclosed on June 24 regarding the approval by the Board of Directors of the share repurchase program for common shares, preferred dividend shares without voting rights, and American Depositary Receipts – ADRs issued by Grupo Cibest (the “Repurchase Program”), the commencement date of the Repurchase Program has been determined.

The Repurchase Program will commence on Thursday, July 17, 2025