Company: CIB
Filing Date: 2025-08-06
Form Type: 6-K
Source: 0002058897-25-000029
Chunk: 0

Company: Grupo Cibest S.A.
Filing Date: 2025-08-06
Form: 6-K
Chunk 0
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### 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

Comission File Number 001-32535</div>

#### Grupo Cibest 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.

<div align='center'>Form 20-F þ Form 40-F o</div>

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.

<div align='center'>Yes o No þ</div>

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-__________.

| 2Q25 |

<div align='center'>GRUPO CIBEST (NYSE: CIB; BVC: CIBEST Y PFCIBEST) REPORTS FINANCIAL RESULTS FOR THE SECOND QUARTER OF 2025</div>

• Net income attributable to shareholders for the second quarter of 2025 was COP 1.8 trillion. This value represents an increase of 3.1% compared to the previous quarter and 24.4% compared to 2Q24. The quarterly annualized return on equity (ROE) for Grupo Cibest was 17.5% for the quarter and 16.1% for the last twelve months.

• The net interest margin for the second quarter of 2025 was 6.57%,