Company: BCDRF
Filing Date: 2025-10-29
Form Type: 6-K
Source: 0000891478-25-000138
Chunk: 0

Company: Banco Santander, S.A.
Filing Date: 2025-10-29
Form: 6-K
Chunk 0
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#### FORM 6-K

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### Report of Foreign Issuer

#### Pursuant to Rule 13a-16 or 15d-16

#### of the Securities Exchange Act of 1934

#### For the month of October, 2025

#### Commission File Number: 001-12518

#### Banco Santander, S.A.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

#### Ciudad Grupo Santander

#### 28660 Boadilla del Monte (Madrid) Spain
<div align='center'>(Address of principal executive office)

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 ☐</div>

#### BANCO SANTANDER, S.A.
#### ________________________

### TABLE OF CONTENTS
| Part 1. Interim unaudited consolidated financial statements |     | 3 |

| Interim condensed consolidated financial statements |     |                                                                                                                              |
| 5                                                   |     | Condensed consolidated balance sheet                                                                                         |
| 7                                                   |     | Condensed consolidated income statements                                                                                     |
| 8                                                   |     | Condensed consolidated statements of recognised income and expense                                                           |
| 9                                                   |     | Condensed consolidated statements of changes in total equity                                                                 |
| 11                                                  |     | Condensed consolidated statements of cash flows                                                                              |
|                                                     |     | Explanatory notes to the interim condensed consolidated financial statements                                                 |
| 12                                                  |     | Note 1: Introduction, basis of presentation of the interim condensed consolidated financial statements and other information |
| 14                                                  |     | Note 2: Grupo Santander                                                                                                      |
| 15                                                  |     | Note 3: Shareholder remuneration system and earnings per share                                                               |
| 17                                                  |     | Note 4: Remuneration and other benefits paid to Banco Santander's directors and senior managers                              |
| 19                                                  |     | Note 5: Financial assets                                                                                                     |
| 22                                                  |     | Note 6: Non-current assets held for sale and liabilities associated with non-current assets held for sale                    |
| 24                                                  |     | Note 7: Tangible assets                                                                                                      |
| 25                                                  |     | Note 8: Intangible assets