Banco Santander buyback spending reaches €696.8M

Purchases under the programme represented approximately 18.3% of shares outstanding as of 2021.

Rhea-AI Filing Summary

Banco Santander, S.A. (SAN) purchased 10,900,000 of its own shares between September 17 and September 23, 2026, under its board-approved buyback programme. Through September 23, the cash amount of shares purchased under the programme was €696,824,000, approximately 38.2% of the programme’s maximum investment amount. The bank stated that purchases under the programme represented approximately 18.3% of its outstanding shares as of 2021. Trades were reported across multiple dates and trading venues.

Key Figures

Shares purchased: 10,900,000 shares Cash amount of shares purchased: €696,824,000 Maximum investment amount used: approximately 38.2% +1 more

4 metrics

Shares purchased 10,900,000 shares Between September 17 and September 23, 2026

Cash amount of shares purchased €696,824,000 Through September 23, 2026

Maximum investment amount used approximately 38.2% Buyback programme through September 23, 2026

Shares repurchased relative to outstanding shares approximately 18.3% Outstanding shares as of 2021

Key Terms

Buyback Programme, weighted average price, maximum investment amount

3 terms

Buyback Programme financial

"the buyback programme of own shares"

weighted average price financial

"Weighted average price (€)"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

maximum investment amount financial

"38.2% of the maximum investment amount"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many shares did SAN repurchase between September 17 and September 23, 2026?

Banco Santander purchased 10,900,000 of its own shares during that period under its buyback programme.

How much had SAN spent on its buyback programme by September 23, 2026?

The cash amount of shares purchased through September 23, 2026 was €696,824,000, approximately 38.2% of the programme’s maximum investment amount.

What were SAN’s weighted average buyback prices on September 23, 2026?

The reported weighted average prices were €12.6638 on XMAD, €12.6527 on CEUX, €12.6542 on TQEX, and €12.6532 on AQEU.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 6-K: How Foreign Companies Report to the SEC →

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Available on EDGAR 09/24/2026 - 06:09 AM Accepted by SEC EDGAR 09/24/2026 - 06:09 AM Learn about SEC filing dates

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 September, 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 X Form 40-F 

Banco Santander, S.A.

TABLE OF CONTENTS

Item
1	Report of Other Relevant Information dated September 24, 2026

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 10 August 2026 (official registry number 3336) (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 17 and 23 September (both inclusive).

The cash amount of the shares purchased to 23 September 2026 as a result of the execution of the Buyback Programme amounts to 696,824,000 Euros, which represents approximately 38.2% 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 18.3% of its outstanding shares as of 2021.

Date	Security	Transaction	Trading venue	Number of shares	Weighted average price (€)
17/09/2026	SAN	Purchase	XMAD	100,000	12.9668
18/09/2026	SAN	Purchase	XMAD	3,650,000	12.6700
18/09/2026	SAN	Purchase	CEUX	1,699,345	12.5928
18/09/2026	SAN	Purchase	TQEX	258,963	12.6166
18/09/2026	SAN	Purchase	AQEU	691,692	12.6149
21/09/2026	SAN	Purchase	XMAD	100,000	12.7150
22/09/2026	SAN	Purchase	XMAD	1,223,128	12.6744
22/09/2026	SAN	Purchase	CEUX	70,503	12.6526
22/09/2026	SAN	Purchase	TQEX	57,366	12.6552
22/09/2026	SAN	Purchase	AQEU	49,003	12.6524
23/09/2026	SAN	Purchase	XMAD	2,200,000	12.6638
23/09/2026	SAN	Purchase	CEUX	436,742	12.6527
23/09/2026	SAN	Purchase	TQEX	128,068	12.6542
23/09/2026	SAN	Purchase	AQEU	235,190	12.6532
			TOTAL	10,900,000

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), 24 September 2026

ANNEX I

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 17/09/2026 and 23/09/2026 (both inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-17-a-23-septiembre-2026-es.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:	September 24, 2026		By:	/s/ Pedro de Mingo Kaminouchi
				Name:	Pedro de Mingo Kaminouchi
				Title:	Head of Corporate Compliance