Company: CIB
Filing Date: 2025-05-20
Form Type: 6-K
Source: 0002058897-25-000007
Chunk: 0

Company: Grupo Cibest S.A.
Filing Date: 2025-05-20
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 May,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.

| Date May 19, 2025 |     | Grupo CIBEST S.A. 
 (Registrant)      
 By:               |     | /s/ MAURICIO BOTERO WOLFF.             |
|:------------------|:----|:------------------|:----|:---------------------------------------|
|                   |     | Name:             |     | Mauricio Botero Wolff                  |
|                   |     | Title:            |     | Vice President of Strategy and Finance |

May 19, 2025

Medellín, Colombia

<div align='center'>GRUPO CIBEST S.A. ANNOUNCES CHANGES IN ITS CAPITAL OWNERSHIP</div>

Grupo Cibest S.A. (“Grupo Cibest”) announces that changes have occurred in its capital ownership as a result of the completion of transactions aimed at evolving the corporate structure of Bancolombia S.A. (“Bancolombia”) and its subsidiaries, particularly the distribution of certain assets and subsidiaries by absorption, by virtue of which Bancolombia, without being dissolved, transferred a portion of its assets in bulk to Grupo Cibest.

Bancolombia