Company: BCDRF
Filing Date: 2025-02-06
Form Type: 6-K
Source: 0000950103-25-001676
Chunk: 0

Company: Banco Santander, S.A.
Filing Date: 2025-02-06
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 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.

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 €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 27 Series Notes, the "Notes"
and each a “Series”) 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 6
February 2025 (the "Tender Offer Memorandum") (the "Offers"). Below is a table with the characteristics
of the Notes and the Offers conditions for its holders:

| Description of Notes                                                     | ISIN         | Outstanding    
 Nominal Amount | Maturity        
 Date            | Bloomberg Reference Page             | Reference Benchmark                 | Purchase Spread | Amount subject to the Offers |
| €1,500,000,000 3.250 per cent. Subordinated Instruments due