Company: BCDRF
Filing Date: 2025-01-15
Form Type: 6-K
Source: 0000950103-25-000489
Chunk: 0

Company: Banco Santander, S.A.
Filing Date: 2025-01-15
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER

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)

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 xForm 40-F ¨</div>

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

TABLE OF CONTENTS</div>

Item 1

<div align='center'>Santander Announces
Results of Offers to Purchase Certain of its Outstanding Debt Securities and Waiver of Maximum Purchase Consideration Condition</div>

Madrid, January 15, 2025– Banco Santander, S.A. (“Santander”) announced today the results, as of 5:00 p.m. (New York
City time) on January 14, 2025 (the “Expiration Time”), of its previously announced offers to purchase for cash (the “Offers”)
its outstanding 3.496% Senior Preferred Fixed Rate Notes due 2025, 2.746% Senior Non Preferred Fixed Rate Notes due 2025, 5.147% Senior
Non Preferred Fixed Rate Notes due 2025 and 1.849% Senior Non Preferred Fixed Rate Notes due 2026 (collectively, the “Notes”)
and that it has waived the maximum purchase consideration condition of $2,000,000,000. The Offers were made upon the terms and subject
to the conditions set forth in the offer to purchase dated January 7, 2025 (the “Offer to Purchase”) and the related notice
of guaranteed delivery (the “Notice of Guaranteed Delivery” and, together with the Offer to Purchase, the “Offer Documents”).

The following table sets forth the aggregate
principal amount of Notes validly tendered and not withdrawn in the Offers at or prior to the Expiration Time:

| Acceptance     
 Priority Level | Description                                    
 of the Notes