Company: BCDRF
Filing Date: 2025-09-30
Form Type: 6-K
Source: 0000950103-25-012515
Chunk: 0

Company: Banco Santander, S.A.
Filing Date: 2025-09-30
Form: 6-K
Chunk 0
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<div align='center'>FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

For the month of September, 2025

Commission File Number: 001-12518

Banco Santander, S.A.

(Exact name of registrant as specified in its charter)

Ciudad Grupo Santander

28660 Boadilla del Monte (Madrid) Spain

(Address of principal executive office)</div>

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

| Form 20-F | X |     | Form 40-F |

<div align='center'>Banco Santander, S.A.

TABLE OF CONTENTS</div>

Item 1

Banco Santander, S.A.(“ Banco Santander” or the “ Bank”), in compliance with the Securities Market legislation, hereby communicates the following:

<div align='center'>inside information</div>

In application of the Bank’s current shareholder remuneration policy, consisting of a total shareholder remuneration target of c. 50% of the Group’s underlying profit 1, split approximately in equal parts in cash dividend payments and share buybacks, the board of directors today approved the payment of an interim cash dividend against 2025 results of 11.5 euro cents per share, equivalent to c. 25 % of the Group’s underlying profit 2in the first half of 2025.

| § | The                                                          
 interim cash dividend will be paid from 3 November 2025; and |

| § | The                                                                                           
 last day to trade shares with a right to receive the interim cash dividend will be 29 October 
 2025, the ex-dividend date will be 30 October 2025 and the record date will be 31 October     
 2025.                                                                                         |

This distribution, together with the on-going share buyback programme that was announced on 30 July 2025, represents the interim shareholder remuneration against the Group underlying profit 3in the first half of 2025.

The implementation of the remainder of the shareholder remuneration policy for 2025 is subject to the appropriate corporate and regulatory approvals and decisions.

Boadilla del Monte (Madrid), 30 September 2025

1