Banco Santander buyback reaches €1.25B by October 14

Q: How many shares did SAN repurchase between October 8 and October 14, 2026?

Banco Santander reported purchases totaling 6,100,000 of its own shares during that period.

Q: Which trading venues did SAN use for the reported buyback transactions?

The reported transactions took place on XMAD, CEUX, TQEX and AQEU.

By October 14, 2026, cash purchases under the programme had reached approximately 68.4% of its maximum investment amount.

Filing Impact

(Moderate)

Filing Sentiment

(Neutral)How Sentiment works

Sentiment and the balance of points

Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.

How Sentiment works How the balance works

Form Type

6-K

Rhea-AI Filing Summary

Banco Santander, S.A. (SAN) purchased 6,100,000 of its own shares between October 8 and October 14, 2026, as part of its buyback programme. Transactions were reported on October 8, 9, 12, 13 and 14, with weighted average prices shown for each reported transaction.

As of October 14, 2026, the cash amount of shares purchased under the programme totaled 1,248,734,451 Euros, approximately 68.4% of the programme’s maximum investment amount. Banco Santander also stated that, with these purchases, it had repurchased approximately 18.5% of its outstanding shares as of 2021.

Key Figures

Shares purchased: 6,100,000 shares Cash amount of shares purchased: 1,248,734,451 Euros Maximum investment amount reached: Approximately 68.4% +1 more

4 metrics

Shares purchased 6,100,000 shares October 8 to October 14, 2026

Cash amount of shares purchased 1,248,734,451 Euros Through October 14, 2026

Maximum investment amount reached Approximately 68.4% Buyback Programme, as of October 14, 2026

Repurchases as a share of outstanding shares Approximately 18.5% Outstanding shares as of 2021

Key Terms

Buyback Programme, weighted average price, outstanding shares

3 terms

Buyback Programme financial

"execution of the Buyback Programme"

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.

outstanding shares financial

"18.5% of its outstanding shares as of 2021"

Outstanding shares are the total number of a company's stock units that are owned by all external investors and insiders, excluding any shares the company holds itself. They matter to investors because they determine each shareholder’s slice of ownership, how company value is divided per share (affecting price and earnings-per-share calculations), and the weight of voting power—like how slicing a pizza into more or fewer pieces changes the size of each person’s share.

FAQ

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

How many shares did SAN repurchase between October 8 and October 14, 2026?

Banco Santander reported purchases totaling 6,100,000 of its own shares during that period.

How much had Banco Santander spent on its buyback by October 14, 2026?

The cash amount of shares purchased under the programme totaled 1,248,734,451 Euros, approximately 68.4% of the programme’s maximum investment amount.

Which trading venues did SAN use for the reported buyback transactions?

The reported transactions took place on XMAD, CEUX, TQEX and 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 10/15/2026 - 06:23 AM EDT Accepted by SEC EDGAR 10/15/2026 - 06:22 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 October, 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 October 15, 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 8 and 14 October (both inclusive).

The cash amount of the shares purchased to 14 October 2026 as a result of the execution of the Buyback Programme amounts to 1,248,734,451 Euros, which represents approximately 68.4% 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 18.5% of its outstanding shares as of 2021.

Date	Security	Transaction	Trading venue	Number of shares	Weighted average price (€)
08/10/2026	SAN	Purchase	XMAD	2,400,000	11.9875
08/10/2026	SAN	Purchase	CEUX	345,713	11.9997
08/10/2026	SAN	Purchase	TQEX	248,790	11.9873
08/10/2026	SAN	Purchase	AQEU	205,497	11.9935
09/10/2026	SAN	Purchase	XMAD	1,000,000	12.0926
12/10/2026	SAN	Purchase	XMAD	400,000	12.1982
13/10/2026	SAN	Purchase	XMAD	500,000	12.2341
14/10/2026	SAN	Purchase	XMAD	986,716	12.0832
14/10/2026	SAN	Purchase	CEUX	9,933	12.0805
14/10/2026	SAN	Purchase	AQEU	3,351	12.0770
			TOTAL	6,100,000

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), 15 October 2026

ANNEX I

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 08/10/2026 and 14/10/2026 (both inclusive)

(https://www.santander.com/content/dam/santander-com/es/documentos/cumplimiento/do-anexo-i-8-a-14-octubre-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:	October 15, 2026	By:	/s/ Pedro de Mingo Kaminouchi
			Name:	Pedro de Mingo Kaminouchi
			Title:	Head of Corporate Compliance

Source: View Original Filing on SEC EDGAR