Company: CIB
Filing Date: 2025-09-30
Form Type: 6-K
Source: 0002058897-25-000041
Chunk: 0

Company: Grupo Cibest S.A.
Filing Date: 2025-09-30
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 September,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 Septemeber, 29, 2025 |     | By:               |     | /s/ MAURICIO BOTERO WOLFF.             |
|                           |     | Name:             |     | Mauricio Botero Wolff                  |
|                           |     | Title:            |     | Vice President of Strategy and Finance |

September 29, 2025

Medellin, Colombia

<div align='center'>GRUPO CIBEST S.A. ANNOUNCES A CORPORATE REORGANIZATION OF BANISTMO S.A. AND OTHER SUBSIDIARIES OF GRUPO CIBEST IN PANAMA</div>

Grupo Cibest S.A. (“Grupo Cibest”) announces that the Superintendency of Banks of Panama has authorized the implementation of a corporate reorganization involving its Panamanian subsidiary, Banistmo S.A. (“Banistmo”), and other subsidiaries of Grupo Cibest in Panama.

The reorganization includes the following transactions (hereinafter, the “Corporate Reorganization”):