Company: BCDRF
Filing Date: 2025-08-28
Form Type: 6-K
Source: 0000950103-25-010833
Chunk: 1

Company: Banco Santander, S.A.
Filing Date: 2025-08-28
Form: 6-K
Chunk 1
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| 27/08/ 2025 | SAN      | Purchase    | TQEX          |           36,377 |           8.0819 |
| 27/08/ 2025 | SAN      | Purchase    | AQEU          |           44,988 |           8.0628 |
|             |          |             | TOTAL         |        5,176,565 |                  |

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), 28 August 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 21/08/2025 and 27/08/2025 (both inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-21-a-27-ago-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: | August 28, 2025 | Banco Santander, S.A. 
 By:                   | /s/ Pedro de Mingo Kaminouchi |                              |
|:------|:----------------|:----------------------|:------------------------------|:-----------------------------|
|       |                 |                       | Name:                         | Pedro de Mingo Kaminouchi    |
|       |                 |                       | Title:                        | Head of Corporate Compliance |