Company: BCDRF
Filing Date: 2025-01-16
Form Type: 6-K
Source: 0000950103-25-000553
Chunk: 0

Company: Banco Santander, S.A.
Filing Date: 2025-01-16
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 January, 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., ("Santander"
or the "Offeror") in accordance with the provisions of the securities market legislation, communicates the following:

<div align='center'>INSIDE INFORMATION</div>

Santander announces that it is inviting
holders (subject to the offer restrictions set forth below) of its outstanding GBP 600,000,000 1.50 per cent. Fixed Rate Senior Non-Preferred
Instruments due 14 April 2026 (ISIN: XS2331739750) (the "Notes") to tender any and all of such Notes for purchase by
the Offeror for cash, subject to applicable law and regulation, the offer and distribution restrictions and the other conditions described
in the tender offer memorandum dated 16 January 2025 (the "Tender Offer Memorandum") (the "Offer").
Below is a table with the characteristics of the Notes and the Offer conditions for its holders:

| Description of Notes                                           | ISIN         | Outstanding Nominal Amount | Maturity Date | Benchmark Security                                                     | Purchase Spread | Amount subject to the Offer |
| GBP 600,000,000 1.50 per cent. Fixed Rate Senior Non-Preferred 
 Instruments due 14 April 2026                                  | XS2331739750 | GBP 600,000,000            | 14 April 2026 | 0.125 per cent. UK Treasury Gilt due January 2026 (ISIN: GB00BL68HJ26) | + 75 bps.       | Any