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 October, 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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Report of Other Relevant Information dated October 30,
2025 |
Item
1

Banco Santander, S.A., ("Santander")
communicates the following:
OTHER RELEVANT
INFORMATION
Santander has been
informed by the European Central Bank (“ECB”), after following its Supervisory Review and Evaluation Process (“SREP”),
of its decision regarding the minimum prudential capital requirements effective as of 1 January 2026.
The ECB’s
decision maintains an unchanged Pillar 2 requirement (“P2R”) of 1.74% at a consolidated level, of which at least 0.98%
must be covered with Common Equity Tier 1 capital (“CET1”). 9 basis points of P2R reflect the capital add-on due to
the ECB’s prudential expectations on calendar provisioning in connection with non-performing loans.
The following table
shows the minimum CET1 and total capital requirements applicable at the consolidated level as of 1 January 2025 and as of 1 January 2026,
as well as Santander's ratios1 as of 30 September 2025:
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Minimum
Requirement |
Data |
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| As
of 01/01/2025 |
As
of 01/01/2026 |
As
of 30/09/2025 |
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| CET1 |
9.652% |
9.85%3 |
13.09% |
|
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| Total
Capital |
13.912% |
14.11%4 |
17.43% |
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The increase in
the minimum requirements applicable both to CET1 and total capital as of 1 January 2026, compared to those in force since 1 January 2025,
amounts to 20 basis points. This increase is due to changes in the systemic risk buffer requirement (3 basis points) and the countercyclical
capital buffer requirement (17 basis points)3.
As described in
the table above, Santander maintains a surplus of capital over these requirements, both in CET1 and total capital terms.
Boadilla del Monte
(Madrid), 30 October 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.
Past performance
does not indicate future outcomes
Statements about
historical performance or growth rates must not be construed as suggesting that future performance, share price or results (including
earnings per share) will necessarily be the same or higher than in a previous period. Nothing in this document should be taken as a profit
and loss forecast.
______________________
1 Phased-in
ratios.
2 Requirements
as of 1 January 2025 considering final figures as of 31 December 2024.
3 The
minimum requirement ratio of CET1 at consolidated level consists of: (a) the minimum capital requirement of Pillar 1 (4.50%), (b) P2R
(0.98%), (c) the capital conservation buffer (2.50%), (d) the requirement arising from the consideration of Santander as Other Systemically
Important Institution (“OSII”), which has been fixed by Banco de España effective on 1 January 2026 (1.25%), (e) the
systemic risk buffer requirement (0.0628%) calculated as of 30 September, and (f) the countercyclical capital buffer requirement (0.4331%)
estimated as of 30 September, which must be increased from 1 October 2025 as a result of the activation of 0.50% over the exposures located
in Spain (0.12%), and again from 1 October 2026, due to an additional increase of 0.50% over such exposures.
4 In
addition to the CET1 requirement, the minimum total capital requirement at consolidated level includes: (i) Pillar 1 requirements of
Additional Tier 1 (1.5%) and Tier 2 (2%), and (ii) part of the P2R requirements which can be covered by Additional Tier 1 and Tier 2
(0.33% y 0.44%, respectively), remaining unchanged with respect to the minimum requirement applicable as of 1 January 2025, save for
the CET1 increase of 20 basis points specified above.
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: |
October 30, 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 |