What did Banco Santander (SAN) disclose about its share buyback in August 2026?

Banco Santander disclosed that between 6 and 12 August 2026 it repurchased 20,000,000 shares under its Buyback Programme, investing part of a total €4,650,490,891 used so far.

What portion of Banco Santander’s share capital has been repurchased under the programme?

Banco Santander reports that, through its Buyback Programme, it has repurchased shares equivalent to approximately 17.8% of its outstanding share capital as of 2021, indicating a sizable reduction in the share base.

Banco Santander nears completion of major share buyback

Q: How much has Banco Santander (SAN) invested in its current Buyback Programme?

By 12 August 2026, Banco Santander had invested €4,650,490,891 in share repurchases, which the bank states equals about 92.5% of the programme’s maximum authorised investment amount.

Banco Santander, S.A. reports continued execution of its share repurchase programme.

Filing Impact

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Filing Sentiment

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Form Type

6-K

Rhea-AI Filing Summary

Banco Santander, S.A. reports continued execution of its share repurchase programme. Between 6 and 12 August 2026 the bank bought back 20,000,000 of its own shares across Spanish (XMAD) and European (CEUX) trading venues at weighted average prices around €12.85–€12.97 per share.

The total cash amount invested in repurchases under the current programme reached €4,650,490,891 as of 12 August 2026, representing approximately 92.5% of the programme’s maximum investment amount. Cumulatively, the bank states it has repurchased roughly 17.8% of its outstanding shares as of 2021 through this programme.

Positive

€4.65B buyback nearly complete, with 92.5% of the authorised cash amount invested, signalling substantial capital return to shareholders.
The programme has led to repurchases equivalent to 17.8% of shares outstanding as of 2021, materially reducing share count and potentially enhancing per-share metrics.

Negative

None.

Key Figures

Buyback cash invested: €4,650,490,891 Share of max programme used: 92.5% Shares repurchased (6–12 Aug 2026): 20,000,000 shares +3 more

6 metrics

Buyback cash invested €4,650,490,891 Total amount invested in the Buyback Programme as of 12 August 2026

Share of max programme used 92.5% Portion of the Buyback Programme’s maximum investment amount already deployed

Shares repurchased (6–12 Aug 2026) 20,000,000 shares Total number of shares bought during the reported period

Buyback as % of 2021 shares 17.8% Cumulative repurchases relative to outstanding shares as of 2021

Weighted average price 06/08/2026 (XMAD) €12.9676 Average price per share for 3,000,000 shares repurchased on XMAD

Weighted average price 10/08/2026 (XMAD) €12.8452 Average price per share for 3,000,000 shares repurchased on XMAD

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

"Reference is made to our notice of inside information of 4 February 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 of 16 April 2014"

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"

ordinary shares financial

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

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

FAQ

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

How much has Banco Santander (SAN) invested in its current Buyback Programme?

By 12 August 2026, Banco Santander had invested €4,650,490,891 in share repurchases, which the bank states equals about 92.5% of the programme’s maximum authorised investment amount.

At what prices did Banco Santander (SAN) repurchase shares in early August 2026?

From 6 to 12 August 2026, the bank repurchased shares at weighted average prices between €12.84 and €12.97 per share across XMAD and CEUX trading venues, according to the disclosed transaction table.

On which trading venues did Banco Santander (SAN) conduct the August 2026 buybacks?

Banco Santander executed the reported August 2026 buybacks on the Spanish market XMAD and the European venue CEUX, purchasing blocks of between 1,000,000 and 3,500,000 shares per trading line.

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

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

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Accepted by SEC EDGAR 08/13/2026 - 06:08 AM EDT

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 August, 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

Form 40-F

Banco Santander, S.A.

TABLE OF CONTENTS

Item

1	Report of Other Relevant Information dated August 13, 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 4 February 2026 (official registry number 3077) (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 6 and 12 August (both inclusive).

The cash amount of the shares purchased to 12 August 2026 as a result of the execution of the Buyback Programme amounts to 4,650,490,891 Euros, which represents approximately 92.5% 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 17.8% of its outstanding shares as of 2021.

Date	Security	Transaction	Trading venue	Number of shares	Weighted average price (€)
06/08/2026	SAN	Purchase	XMAD	3,000,000	12.9676
07/08/2026	SAN	Purchase	XMAD	3,500,000	12.9057
07/08/2026	SAN	Purchase	CEUX	1,000,000	12.9058
10/08/2026	SAN	Purchase	XMAD	3,000,000	12.8452
10/08/2026	SAN	Purchase	CEUX	1,000,000	12.8441
11/08/2026	SAN	Purchase	XMAD	3,500,000	12.8846
11/08/2026	SAN	Purchase	CEUX	1,000,000	12.8830
12/08/2026	SAN	Purchase	XMAD	3,000,000	12.9112
12/08/2026	SAN	Purchase	CEUX	1,000,000	12.9110
			TOTAL	20,000,000

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), 13 August 2026

ANNEX I

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 06/08/2026 and 12/08/2026 (both inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-06-a-12-agosto-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:	August 13, 2026	By:	/s/ Pedro de Mingo Kaminouchi
			Name:	Pedro de Mingo Kaminouchi
			Title:	Head of Corporate Compliance

Source: View Original Filing on SEC EDGAR