Company: BCDRF
Filing Date: 2025-05-14
Form Type: 6-K
Source: 0000950103-25-005980
Chunk: 1

Company: Banco Santander, S.A.
Filing Date: 2025-05-14
Form: 6-K
Chunk 1
---
 | Purchase    | AQEU          |           65,937 |            6.7473 |
| 13/05/2025 | SAN      | Purchase    | XMAD          |          852,823 |            6.7564 |
| 13/05/2025 | SAN      | Purchase    | CEUX          |          179,195 |            6.7596 |
| 13/05/2025 | SAN      | Purchase    | TQEX          |           73,918 |            6.7579 |
| 13/05/2025 | SAN      | Purchase    | AQEU          |           94,064 |            6.7625 |
|            |          |             | TOTAL         |        7,700,000 |                   |

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), 14 May 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 07/05/2025 and 13/05/2025 (both inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-07-a-13-may-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: | May 14, 2025 |     | Banco Santander, S.A. 
 By:                   | /s/ Pedro de Mingo Kaminouchi |                              |
|:------|:-------------|:----|:----------------------|:------------------------------|:-----------------------------|
|       |              |     |                       | Name:                         | Pedro de Mingo Kaminouchi    |
|       |              |     |                       | Title:                        | Head of Corporate Compliance |