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SAN 6-K

Banco Santander, S.A. (SAN)

6-K 2025-03-20 For: 2025-03-20
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Added on April 11, 2026

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 March, 2025

Commission File Number: 001-12518

Banco Santander, S.A.

(Exact name ofregistrant as specified in its charter)

Ciudad Grupo Santander

28660 Boadilla del Monte (Madrid) Spain

(Address of principalexecutive 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 X Form 40-F

Banco Santander,S.A.

TABLE OF CONTENTS

Item
1 Report of Other Relevant Information dated March 20, 2025
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Item1


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

OTHER RELEVANT INFORMATION

Reference is made to our notice of inside information of 5 February 2025 (official registry number 2584) (the “Buy-back Commencement Communication”), relating to the buyback programme of own shares (the “Buy-back Programme”) approved by the Board of Directors of Banco Santander.

Pursuant to article 5 of Regulation (EU) no. 596/2014 on Market Abuse of 16 April 2014, and articles 2.2 and 2.3 of Commission Delegated Regulation (EU) 2016/1052, of 8 March 2016, the Bank informs of the transactions carried out over its own shares between 13 and 19 March 2025 (both inclusive).

The cash amount of the shares purchased to 19 March 2025 as a result of the execution of the Buy-back Programme amounts to 512,284,850 Euros, which represents approximately 32.3% of the maximum investment amount of the Buy-back Programme. The programme was announced together with its other characteristics through the Buy-back Commencement Communication. With these purchases, the Bank has repurchased approximately 13.1% of its outstanding shares as of 2021.

Date Security Transaction Trading venue Number of shares Weighted average price (€)
13/03/2025 SAN Purchase XMAD 2,310,094 5.9823
13/03/2025 SAN Purchase CEUX 382,805 5.9956
13/03/2025 SAN Purchase TQEX 117,811 5.9960
13/03/2025 SAN Purchase AQEU 189,290 5.9901
14/03/2025 SAN Purchase XMAD 1,670,657 6.1114
14/03/2025 SAN Purchase CEUX 305,161 6.1296
14/03/2025 SAN Purchase TQEX 97,959 6.1398
14/03/2025 SAN Purchase AQEU 126,223 6.1453
17/03/2025 SAN Purchase XMAD 1,126,369 6.2765
17/03/2025 SAN Purchase CEUX 512,727 6.2768
17/03/2025 SAN Purchase TQEX 116,538 6.2866
17/03/2025 SAN Purchase AQEU 244,366 6.2826
18/03/2025 SAN Purchase XMAD 1,528,799 6.4981
18/03/2025 SAN Purchase CEUX 251,129 6.4844
18/03/2025 SAN Purchase TQEX 72,398 6.5067
18/03/2025 SAN Purchase AQEU 147,674 6.4793
19/03/2025 SAN Purchase XMAD 500,000 6.5578
TOTAL 9,700,000
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Issuer name: Banco Santander, S.A. - LEI 5493006QMFDDMYWIAM13

Reference of the financial instrument: ordinary shares - Code ISIN ES0113900J37

Detailed information of the transactions carried out within the referred period is attached as Annex I.

Boadilla del Monte (Madrid), 20 March 2025

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ANNEX I

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 13/03/2025 and 19/03/2025 (both inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-13-mar-a-19-mar-2025.pdf)

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.

Banco Santander, S.A.
Date: March 20, 2025 By: /s/ Pedro de Mingo Kaminouchi
Name: Pedro de Mingo Kaminouchi
Title: Head of Corporate Compliance