Banco Santander repurchases 11.4M shares in buyback

Banco Santander details recent buyback trades, bringing total programme investment to about €305.9 million, or 16.8% of the authorised amount.

Rhea-AI Filing Summary

Banco Santander, S.A. (SAN) reports continued execution of its share buyback programme, disclosing purchases of its own ordinary shares between August 27 and September 2, 2026 under the previously announced Buyback Programme. During this period, the bank repurchased a total of 11,400,000 shares across multiple European trading venues.

The total cash amount invested in the Buyback Programme up to September 2, 2026 is €305,890,700, representing approximately 16.8% of the maximum investment amount authorised for the programme. Banco Santander states that, with these purchases, it has repurchased approximately 18.1% of its outstanding shares as of 2021.

Positive

• Significant progress in share buyback: Banco Santander has invested €305,890,700 in its Buyback Programme, reaching 16.8% of the authorised maximum and indicating that it has repurchased approximately 18.1% of its outstanding shares as of 2021.

Negative

• None.

Key Figures

Shares repurchased in period: 11,400,000 shares Cumulative buyback investment: €305,890,700 Share of maximum programme amount used: 16.8% +2 more

5 metrics

Shares repurchased in period 11,400,000 shares Own shares bought between August 27 and September 2, 2026 under the Buyback Programme

Cumulative buyback investment €305,890,700 Total cash amount invested in the Buyback Programme as of September 2, 2026

Share of maximum programme amount used 16.8% Portion of the Buyback Programme’s maximum authorised investment reached by September 2, 2026

Cumulative shares repurchased vs 2021 outstanding 18.1% Banco Santander’s statement on total shares repurchased as a percentage of outstanding shares as of 2021

Example weighted average price €12.6238 Weighted average purchase price for SAN on XMAD on August 27, 2026

Key Terms

Buyback Programme, inside information, Market Abuse, Commission Delegated Regulation (EU) 2016/1052, +1 more

5 terms

Buyback Programme financial

"relating to the buyback programme of own shares (the “Buyback Programme”)"

inside information regulatory

"notice of inside information of 10 August 2026"

Information not available to the public that, if known, would likely cause a company’s stock or bonds to rise or fall—for example, undisclosed earnings, deals, product results, or management plans. It matters because trading on that information gives an unfair advantage, can distort market prices, and is typically illegal or subject to strict rules, so investors watch for proper disclosure and compliance to protect fair, transparent markets.

Market Abuse regulatory

"Pursuant to article 5 of Regulation (EU) no. 596/2014 on Market Abuse"

Market abuse is illegal or unethical behavior that distorts the price or fairness of buying and selling financial assets, such as using secret information to trade, spreading false or misleading news, or creating fake buying and selling to give a false impression of demand. It matters to investors because it can cause unfair losses, unreliable prices and legal or reputational fallout; like cheating in a game or tampering with a scale, it destroys confidence that markets reflect true value.

Commission Delegated Regulation (EU) 2016/1052 regulatory

"and articles 2.2 and 2.3 of Commission Delegated Regulation (EU) 2016/1052"

weighted average price financial

"Number of shares | 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.

FAQ

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

What does Banco Santander (SAN) report in this Form 6-K?

Banco Santander reports transactions under its share Buyback Programme between August 27 and September 2, 2026, including the number of shares repurchased on each venue, total shares bought, and the cumulative cash amount invested in the programme to date.

How many Banco Santander (SAN) shares were repurchased in the reported period?

Between August 27 and September 2, 2026, Banco Santander repurchased a total of 11,400,000 ordinary shares under its Buyback Programme across XMAD, CEUX, TQEX and AQEU trading venues.

What is the total cash amount invested so far in the Banco Santander (SAN) Buyback Programme?

As of September 2, 2026, the cash amount invested in the Buyback Programme is €305,890,700, which the bank states corresponds to approximately 16.8% of the programme’s maximum authorised investment amount.

What proportion of its outstanding shares has Banco Santander (SAN) repurchased?

Banco Santander states that, with the reported purchases, it has repurchased approximately 18.1% of its outstanding shares as of 2021 in aggregate under its Buyback Programmes.

Where can investors find detailed trade data for the Banco Santander (SAN) buyback?

Detailed information for each transaction between August 27 and September 2, 2026 is provided in Annex I, available through a linked PDF on Santander’s website, listing trade-by-trade data within the Buyback Programme.

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

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Available on EDGAR 09/03/2026 - 06:12 AM EDT Accepted by SEC EDGAR 09/03/2026 - 06:11 AM EDT 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 3, 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 27 August and 2 September (both inclusive).

The cash amount of the shares purchased to 2 September 2026 as a result of the execution of the Buyback Programme amounts to 305,890,700 Euros, which represents approximately 16.8% 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 18.1% of its outstanding shares as of 2021.

Date	Security	Transaction	Trading venue	Number of shares	Weighted average price (€)
27/08/2026	SAN	Purchase	XMAD	1,950,000	12.6238
27/08/2026	SAN	Purchase	CEUX	888,587	12.6074
27/08/2026	SAN	Purchase	TQEX	239,953	12.6164
27/08/2026	SAN	Purchase	AQEU	421,460	12.5986
28/08/2026	SAN	Purchase	XMAD	1,170,524	12.6592
28/08/2026	SAN	Purchase	CEUX	198,213	12.6473
28/08/2026	SAN	Purchase	TQEX	44,538	12.6532
28/08/2026	SAN	Purchase	AQEU	86,725	12.6487
31/08/2026	SAN	Purchase	XMAD	877,379	12.7376
31/08/2026	SAN	Purchase	CEUX	183,649	12.7390
31/08/2026	SAN	Purchase	TQEX	57,484	12.7552
31/08/2026	SAN	Purchase	AQEU	81,488	12.7431
01/09/2026	SAN	Purchase	XMAD	2,300,000	12.5551
01/09/2026	SAN	Purchase	CEUX	451,215	12.5037
01/09/2026	SAN	Purchase	TQEX	208,479	12.5171
01/09/2026	SAN	Purchase	AQEU	240,306	12.5207
02/09/2026	SAN	Purchase	XMAD	1,600,000	12.6803
02/09/2026	SAN	Purchase	CEUX	225,254	12.6484
02/09/2026	SAN	Purchase	TQEX	66,505	12.6310
02/09/2026	SAN	Purchase	AQEU	108,241	12.6437
			TOTAL	11,400,000

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), 3 September 2026

ANNEX I

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 27/08/2026 and 02/09/2026 (both inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-27-agosto-a-02-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 3, 2026	By:	/s/ Pedro de Mingo Kaminouchi
			Name:	Pedro de Mingo Kaminouchi
			Title:	Head of Corporate Compliance