Company: BCDRF
Filing Date: 2025-10-29
Form Type: 6-K
Source: 0000891478-25-000138
Chunk: 54

Company: Banco Santander, S.A.
Filing Date: 2025-10-29
Form: 6-K
Chunk 54
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 |        |                       |     — |       |                    |      — |        |                                                    |   1 |     |                                            |    — |      |                         |    — |      |       |  -3 |      |                                                       |     4 |        |
| Swaps                                                                         |     |                                                       |     6 |        |                       |     — |       |                    |      — |        |                                                    |   — |     |                                            |    — |      |                         |    — |      |       |  -3 |      |                                                       |     3 |        |
| Interest rate options                                                         |     |                                                       |     — |        |                       |     — |       |                    |      — |        |                                                    |   1 |     |                                            |    — |      |                         |    — |      |       |   — |      |                                                       |     1 |        |
| Financial liabilities designated at fair value through profit or loss         |     |                                                       |    29 |        |                       |     — |       |                    |     -5 |        |                                                    |   — |     |                                            |    — |      |                         |  -10 |      |       |   — |      |                                                       |    14 |        |
| Liabilities under insurance contracts                                         |     |                                                       |   323 |        |                       |     — |       |                    |      — |        |                                                    | -19 |     |                                            |    — |      |                         |    — |      |       | -37 |      |                                                       |   267 |        |
| TOTAL LIABILITIES                                                             |     |                                                       |       |  1,227 |                       |       |   371 |                    |        |   -131 |                                                    |     | 185 |                                            |      |    — |                         |      | -227 |       |     |  -69 |                                                       |       |  1,356 |

| January - September 2025 |     | 53 |

#### 17. Explanation added for translation to English
These interim condensed consolidated financial statements are presented on the basis of the regulatory financial reporting framework applicable to Grupo Santander in Spain (see Note 1.b).

| 54 |     | January - September 2025 |

### 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, there