Company: CIB
Filing Date: 2025-08-15
Form Type: 6-K
Source: 0002058897-25-000035
Chunk: 1

Company: Grupo Cibest S.A.
Filing Date: 2025-08-15
Form: 6-K
Chunk 1
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2025

Medellin, Colombia

<div align='center'>GRUPO CIBEST S.A. RELEASES QUARTERLY REPORT FOR THE SECOND QUARTER OF 2025</div>

On August 6th of 2025, Grupo Cibest S.A. (“Grupo Cibest”) furnished on Form 6-K a press release presenting financial information for the fiscal quarter ended June 30, 2025 (the “Press Release”).

The quarterly report for the fiscal quarter ended June 30, 2025 (the “Quarterly Report”) is furnished with this Form 6-K.

Readers should be aware that the consolidated financial information in the Press Release, and the consolidated financial information in the Quarterly Report for the fiscal quarter ended June 30, 2025, are the same, and the Quarterly Report is being furnished solely to fulfill a legal reporting requirement in Colombia. Readers should also be aware that all financial information of Grupo Cibest that is included in the Quarterly Report was prepared in accordance with international or U.S. standards.

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#### Quarterly Report

#### April - June2025

#### Grupo Cibest S.A.
<div align='center'>Address:</div>

#### Carrera 48 # 26-85

#### Medellín, Colombia
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#### ISSUER’S CURRENT SECURITIES

#### As of June 30, 2025
| Type of Share         |     |                   Common Share |     |                Preferred Share |
| Trading System        |     |                 Stock Exchange |     |                 Stock Exchange |
| Stock Exchanges       |     | Colombian Stock Exchange (BVC) |     | Colombian Stock Exchange (BVC) |
| Shares in Circulation |     |                    509,704,584 |     |                    452,122,416 |
| Shareholders          |     |                         20,116 |     |                         33,067 |
| Issuance amount       |     |                    509,704,584 |     |                    452,122,416 |
| Amount placed         |     |                    509,704,584 |     |                    452,122,416 |

Until May 16, the common and preferred shares of Grupo Cibest were listed on the Colombian Stock Exchange (BVC) under the issuer Bancolombia, with the ticker symbols BCOLOMBIA and PFBCOLOM. Following the corporate structure changes that took place