Company: BCDRF
Filing Date: 2025-01-07
Form Type: 6-K
Source: 0001193125-25-002490
Chunk: 0

Company: Banco Santander, S.A.
Filing Date: 2025-01-07
Form: 6-K
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

### REPORT OF
FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16OR 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 ☒ Form 40-F ☐

Banco Santander, S.A. TABLE OF CONTENTS

Item 1 Santander Commences Offers to Purchase Certain of its Outstanding Debt Securities Madrid, January 7, 2025 – Banco Santander, S.A. (“Santander”) announced today the launch of four concurrent and separate 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”), 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 Notes subject to the Offers and the key economic terms of the Offers:

| Acceptance 
 Priority   
 Level      |     | Description of                                        
 the Notes                                             |     | CUSIP/ISIN   |     | Principal Amount 
      Outstanding |     | Maturity Date   |     | Reference                  
 U.S.                       
 Treasury Security          |     | Bloomberg      
 Reference Page |     |   Fixed Spread 
 (Basis Points) |
| 1          |     | 3.496% Senior Preferred Fixed Rate Notes due 2025     |     | 05964HAP0/   
 US05964HAP01 |