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
August, 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:
Banco Santander,
S.A.
TABLE OF CONTENTS
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1 |
Report of Other Relevant Information dated August 29, 2025 |
Item
1

Banco
Santander, S.A. (the “Issuer” or the “Bank”),
in compliance with the Securities Market legislation, hereby communicates the following:
OTHER
RELEVANT INFORMATION
In
relation to the “Issuance of Banco Santander, S.A. Internationalization Covered Bonds Series
4 – March 2026” (“Emisión de Cédulas de Internacionalización
Banco Santander, S.A. Serie 4 – Marzo 2026”), with ISIN code ES0413900707, for an amount of one billion dolars (USD 1,000,000,000),
whose Final Conditions were filed with the Spanish National Securities Market Commission (the “CNMV”)
on 4 March 2021 (hereinafter, as amended on the 3rd May 2023, the “Issuance” or
the “Series 4”)”, the Issuer has carried out a process to gather the consent
of each and every investor of the Issuance for the purpose of: (i) extending the maturity of the Issuance, and accordingly, (ii) modifying
the applicable interest rate which should be applicable from the next interest payment date (excluded) to the new maturity date (included).
In particular, once the consent of the
holders representing 100% of the Issuance has been obtained, the following modifications have been made:
| - | the maturity
date (previously being 4th March 2026) is extended up to the 4th September
2030; and |
| - | the interest
rate (previously being Compounded SOFR 6 months plus 53.826 basis points) applicable from
the next interest payment date (excluded), i.e., 4th September 2025, to the new
maturity date is: Compounded SOFR 6 months plus 55.942 basis points. |
In everything not
expressly described in the preceding paragraphs, the same terms and conditions that were established in the Final Conditions, prior to
this modification, will still apply.
New Final Conditions applicable to Series
4 can be found on the CNMV website.
Likewise,
it is hereby stated that all the necessary communications have been made to the relevant bodies.
The
foregoing is hereby disclosed as other relevant information for all relevant purposes.
Boadilla
del Monte (Madrid), 29 August 2025
IMPORTANT INFORMATION
Not a
securities offer
This document
and the information it contains does not constitute an offer to sell nor the solicitation of an offer to buy any securities.
SIGNATURE
Pursuant to the
requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned,
thereunto duly authorized.
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Banco Santander, S.A. |
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Date: |
August 29, 2025 |
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By: |
/s/ Pedro de Mingo Kaminouchi |
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Name: |
Pedro de Mingo Kaminouchi |
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Title: |
Head of Corporate Compliance |