Company: BCDRF
Filing Date: 2025-06-10
Form Type: 6-K
Source: 0000950103-25-007199
Chunk: 1

Company: Banco Santander, S.A.
Filing Date: 2025-06-10
Form: 6-K
Chunk 1
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| Boadilla                                                                                                                                     
 del Monte (Madrid), 10 June 2025                                                                                                             |

1

<div align='center'>SIGNATURE</div>

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.

| Date: | June 10, 2025 |     | Banco Santander, S.A. 
 By:                   | /s/ Pedro de Mingo Kaminouchi |                              |
|:------|:--------------|:----|:----------------------|:------------------------------|:-----------------------------|
|       |               |     |                       | Name:                         | Pedro de Mingo Kaminouchi    |
|       |               |     |                       | Title:                        | Head of Corporate Compliance |