Company: CIB
Filing Date: 2025-08-15
Form Type: 6-K
Source: 0002058897-25-000035
Chunk: 0

Company: Grupo Cibest S.A.
Filing Date: 2025-08-15
Form: 6-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington D.C. 20549

#### FORM 6-K

### REPORT OF FOREIGN PRIVATE ISSUER

#### PURSUANT TO RULE 13a-16 OR 15d-16 OF

#### THE SECURITIES EXCHANGE ACT OF 1934
<div align='center'>For the month of Aug 2025

Commission File Number 001-32535</div>

#### Bancolombia S.A.
<div align='center'>(Translation of registrant’s name into English)

Cra. 48 

# 26-85
Medellín, Colombia

(Address of principal executive offices)</div>

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-F ☐ |     | Form 40-F ☐ |

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):___

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(2):___

Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

| Yes ☐ |     | No ☐ |

<div align='center'>If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-____________ .</div>

| 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 August 14, 2025 |     | BANCOLOMBIA S.A. 
 (Registrant)     
 By:              |     | /s/ MAURICIO BOTERO WOLFF.             |
|:---------------------|:----|:-----------------|:----|:---------------------------------------|
|                      |     | Name:            |     | Mauricio Botero Wolff.                 |
|                      |     | Title:           |     | Vice President of Strategy and Finance |

August 14,