Company: CIB
Filing Date: 2025-06-24
Form Type: 6-K
Source: 0002058897-25-000020
Chunk: 0

Company: Grupo Cibest S.A.
Filing Date: 2025-06-24
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, 24, 2025 |     | By:               |     | /s/ MAURICIO BOTERO WOLFF.             |
|                     |     | Name:             |     | Mauricio Botero Wolff                  |
|                     |     | Title:            |     | Vice President of Strategy and Finance |

June 24, 2025

Medellin, Colombia

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

Today, the Board of Directors of Grupo Cibest S.A. (“Grupo Cibest”) approved the regulation for the repurchase program of the company’s common shares, preferred shares, and American Depositary Receipts – ADRs issued by Grupo Cibest, for an amount of up to one trillion three hundred fifty billion Colombian pesos (COP$1,350,000,000,000) and, for a period of up to one (1) year effective today from