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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\nOctober, 2026

Commission File\nNumber: 001-12518

Banco Santander, S.A.

(Exact name of\nregistrant as specified in its charter)

Ciudad Grupo Santander

28660 Boadilla del Monte (Madrid) Spain

(Address of principal\nexecutive office)

Indicate by check mark whether the registrant\nfiles or will file annual reports under cover of Form 20-F or Form 40-F:

\n \n \n \n \n \n \n

Form 20-F

Form 40-F

Banco Santander,\nS.A.

TABLE OF CONTENTS

\n \n \n \n \n \n \n \n \n \n

Item

1\t	Report of Other Relevant Information dated October 21, 2026\n\n

Item\n1

$\"\"$

Banco\nSantander, S.A. (“Santander” or the “Bank”), in compliance with the Securities Market legislation,\nhereby communicates the following:

OTHER\nRELEVANT INFORMATION

Santander\nhereby announces that it shall disclose its financial results for the first nine months of 2026 next Wednesday, 28 October 2026.

To\nthis end, a presentation will be given to analysts via audio conference at 10:00 a.m. (Madrid time), which can be followed through the\nBank’s corporate website www.santander.com. The associated\ndocumentation will be made public prior to its commencement through a communication to the CNMV and publication on the aforementioned\ncorporate website.

Additionally,\na presentation for the media will be held via audioconference at 12:00 p.m. (Madrid time).

Boadilla\ndel Monte (Madrid), 21 October 2026

SIGNATURE

Pursuant to the\nrequirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned,\nthereunto duly authorized.

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

		Banco Santander, S.A.


Date:	October 21, 2026		By:	/s/ Pedro de Mingo Kaminouchi
				Name:	Pedro de Mingo Kaminouchi
				Title:	Head of Corporate Compliance

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