Company: BCDRF
Filing Date: 2025-10-29
Form Type: 6-K
Source: 0000891478-25-000132
Chunk: 80

Company: Banco Santander, S.A.
Filing Date: 2025-10-29
Form: 6-K
Chunk 80
---
, comprehensive or complete, nor are they obliged to keep them updated, nor to correct them in the case that any deficiency, error or omission were to be detected. Moreover, in reproducing these contents in by any means, Santander may introduce any changes it deems suitable, and may omit, partially or completely, any of the elements of this report, and in case of any deviation, Santander assumes no liability for any discrepancy.

Sale of 49% stake in Santander Bank Polska to Erste Group

All figures, including P&L, loans and advances to customers, customer funds and other metrics are presented on an underlying basis and include Santander Bank Polska, in line with previously published quarterly information, i.e. maintaining the same perimeter that existed at the time of the announcement of the sale of 49% stake in Santander Bank Polska to Erste Group (https://www.santander.com/content/dam/santander-com/en/documentos/informacion-privilegiada/2025/05/hr-2025-05-05-santander-announces-the-sale-of-49-per-cent-of-santander-polska-to-erste-group-bank-and-agrees-strategic-cooperation-across-cib-and-payments-en.pdf). For further information, see the 'Alternative performance measures' section of Banco Santander, S.A. (Santander) Q3 2025 Financial Report, published on 29 October 2025 (https://www.santander.com/en/shareholders-and-investors/financial-and-economic-information#quarterly-results).

| This document is a translation of a document originally issued in Spanish. Should there be any discrepancies between the English and the Spanish versions, only the original Spanish version should be binding. |

| 94 |     | January- September2025 |

### 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.

|                         |     | Banco Santander, S.A. |     |                         |
| Date:   29 October 2025 |     | By:                   |     | /s/ José García Cantera |
|                         |     | Name:                 |     | José García Cantera     |
|                         |     | Title:                |     | Chief Financial Officer |