Company: BCDRF
Filing Date: 2025-02-14
Form Type: 6-K/A
Source: 0000950103-25-002014
Chunk: 0

Company: Banco Santander, S.A.
Filing Date: 2025-02-14
Form: 6-K/A
Chunk 0
---
<div align='center'>FORM 6-K/A

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 February, 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.

EXPLANATORY NOTE</div>

Banco Santander, S.A. is furnishing this Report on Form 6-K/A, to amend an error in the Report of Other Relevant Information dated February 13, 2025 included in Santander’s Report on Form 6-K furnished to the Securities and Exchange Commission on February 13, 2025 (accession no. 0000950103-25-001941) (the “Original 6-K”). The correct outstanding nominal amount of EUR 2027 Notes following the Settlement Date is €436,400,000. The remainder of the information contained in the Original 6-K remains unchanged.

<div align='center'>TABLE OF CONTENTS</div>

Item 1

Banco Santander, S.A., (“Santander”
or the “Offeror”) in accordance with the provisions of the securities market legislation, communicates the following:

<div align='center'>OTHER RELEVANT INFORMATION</div>

Further to the communication made on
6 February 2025 (registered under number 2585) regarding the invitation by Santander to holders of its outstanding €1,500,000,000
3.250 per cent. Subordinated Instruments due April 2026 (ISIN: XS1384064587) (the "EUR 2026 Notes") and €1,000,000,000
3.125 per cent. Subordinated Instruments due January 2027 (ISIN: XS1548444816) (the "EUR 2027 Notes" and, together with
the EUR 2026 Notes, the "