[6-K] Banco Santander, S.A. Current Report (Foreign Issuer)

Rhea-AI Filing Summary

Banco Santander, S.A. reports further progress on its share buyback programme. Between 13 and 19 November 2025, the bank repurchased 12,000,000 ordinary shares on several European trading venues, including XMAD, CEUX, TQEX and AQEU, at weighted average prices generally between €8.78 and €9.57 per share.

The total cash amount invested in the buyback to 19 November 2025 has reached €1,255,460,584, which is about 73.9% of the programme’s maximum investment amount. With these purchases, Banco Santander states it has repurchased approximately 15% of its outstanding shares as of 2021.

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 November, 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:

Form 20-F X Form 40-F

Banco Santander, S.A.

TABLE OF CONTENTS

Item
1	Report of Other Relevant Information dated November 20, 2025

Item 1

 

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 30 July 2025 (official registry number 2844) (the “Buyback Commencement Communication”), relating to the buyback programme of own shares (the “Buyback 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 November 2025 (both inclusive).

The cash amount of the shares purchased to 19 November 2025 as a result of the execution of the Buyback Programme amounts to 1,255,460,584 Euros, which represents approximately 73.9% of the maximum investment amount of the Buyback Programme. The programme was announced together with its other characteristics through the Buyback Commencement Communication. With these purchases, the Bank has repurchased approximately 15% of its outstanding shares as of 2021.

Date	Security	Transaction	Trading venue	Number of shares	Weighted average price (€)
13/11/2025	SAN	Purchase	XMAD	1,210,000	9.5683
13/11/2025	SAN	Purchase	CEUX	384,318	9.5663
13/11/2025	SAN	Purchase	TQEX	97,452	9.5647
13/11/2025	SAN	Purchase	AQEU	208,230	9.5631
14/11/2025	SAN	Purchase	XMAD	1,390,000	9.3137
14/11/2025	SAN	Purchase	CEUX	415,569	9.3032
14/11/2025	SAN	Purchase	TQEX	129,355	9.2930
14/11/2025	SAN	Purchase	AQEU	265,076	9.2983
17/11/2025	SAN	Purchase	XMAD	900,319	9.1987
17/11/2025	SAN	Purchase	CEUX	870,171	9.1550
17/11/2025	SAN	Purchase	TQEX	193,249	9.1541
17/11/2025	SAN	Purchase	AQEU	336,261	9.1523
18/11/2025	SAN	Purchase	XMAD	2,460,000	8.8373
18/11/2025	SAN	Purchase	CEUX	699,160	8.8141
18/11/2025	SAN	Purchase	TQEX	206,359	8.8363
18/11/2025	SAN	Purchase	AQEU	234,481	8.8047
19/11/2025	SAN	Purchase	XMAD	1,866,805	8.8817
19/11/2025	SAN	Purchase	CEUX	58,527	8.7865
19/11/2025	SAN	Purchase	TQEX	29,986	8.7800
19/11/2025	SAN	Purchase	AQEU	44,682	8.7763
			TOTAL	12,000,000

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 November 2025

 

ANNEX I

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 13/11/2025 and 19/11/2025 (both inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-13-a-19-11-2025.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:	November 20, 2025		By:	/s/ Pedro de Mingo Kaminouchi
				Name:	Pedro de Mingo Kaminouchi
				Title:	Head of Corporate Compliance

FAQ

What does Banco Santander (SAN) report in its November 2025 Form 6-K?

The Form 6-K reports share repurchases made under Banco Santander's ongoing buyback programme, including trades between 13 and 19 November 2025 and the cumulative cash invested so far.

How much has Banco Santander invested in its share buyback programme so far?

Banco Santander states that, as of 19 November 2025, it has invested €1,255,460,584 in its buyback programme, equal to approximately 73.9% of the programme's maximum investment amount.

How many Banco Santander shares were repurchased between 13 and 19 November 2025?

Between 13 and 19 November 2025, Banco Santander repurchased a total of 12,000,000 ordinary shares across several trading venues, including XMAD, CEUX, TQEX and AQEU.

At what prices did Banco Santander buy back its shares in this period?

During this period, Banco Santander executed purchases at weighted average prices generally ranging from about €8.78 to €9.57 per share, depending on the trading venue and date.

What portion of Banco Santander's share capital has been repurchased through the programme?

Banco Santander indicates that, with these latest purchases, it has repurchased approximately 15% of its outstanding shares as of 2021 under the buyback programme.

What type of shares is Banco Santander buying back under the programme?

The bank is buying back its ordinary shares, identified with ISIN code ES0113900J37 and traded under the ticker SAN on the referenced European trading venues.