Company: BCDRF
Filing Date: 2025-04-29
Form Type: 6-K
Source: 0000950103-25-005339
Chunk: 1

Company: Banco Santander, S.A.
Filing Date: 2025-04-29
Form: 6-K
Chunk 1
---
      | Purchase    | AQEU          |          128,585 |                     6.4893 |
|            |          |             | TOTAL         |       10,000,000 |                            |

Issuer name: Banco Santander, S.A. - LEI
5493006QMFDDMYWIAM13

Reference of the financial instrument: ordinary
shares - Code ISIN ES0113900J37

Detailed information of the transactions carried
out within the referred period is attached as Annex I.

Boadilla del Monte (Madrid), 29 April 2025

<div align='center'>ANNEX I</div>

Detailed
information on each of the transactions carried out within the context of the Buy-back Programme between 23/04/2025 and 28/04/2025 (both
inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-23-a-28-abr-2025.pdf)

<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: | April 29, 2025 |     | Banco Santander, S.A. 
 By:                   | /s/ Pedro de Mingo Kaminouchi |                              |
|:------|:---------------|:----|:----------------------|:------------------------------|:-----------------------------|
|       |                |     |                       | Name:                         | Pedro de Mingo Kaminouchi    |
|       |                |     |                       | Title:                        | Head of Corporate Compliance |