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Banco Santander, S.A.

For the period ended Sep 30, 2026. Filed Oct 28, 2026.

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What a company based outside the US has published at home or sent to its shareholders. It is how many foreign companies share results and news between annual reports.

Sep 30, 2026 · Filed Oct 28, 2026

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6-K 1 financieroq326ingles.htm 6-K

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, 2026

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. January - September 2026 Financial Report1
January - September2026

Index

3SIGNIFICANT EVENTS IN THE PERIOD
5KEY CONSOLIDATED DATA
7BUSINESS MODEL
8GROUP FINANCIAL INFORMATION
8General background
9Highlights of the period
11Income statement
19Balance sheet
22Solvency ratios
23Risk management
27The Santander share
29FINANCIAL INFORMATION BY SEGMENT
46SUSTAINABILITY
47CORPORATE GOVERNANCE
48APPENDIX
49Financial information
71Alternative performance measures
84Interim condensed consolidated financial statements
87Glossary
88Important information

This report was approved by the board of directors on 27 October 2026, following a favourable report from the audit committee. Important information regarding this report can be found on pages 88 and 89.

ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.