RNS Number : 4478S Banco Santander S.A. 27 August 2026  

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 24 and 26 August (both inclusive).

The cash amount of the shares purchased to 26 August 2026 as a result of the execution of the Buyback Programme amounts to 161,979,040 Euros, which represents approximately 8.9% 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 18% of its outstanding shares as of 2021.

Date

Security

Transaction

Trading venue

Number of shares

Weighted average price (€)

24/08/2026

SAN

Purchase

XMAD

3,766,794

12.6456

24/08/2026

SAN

Purchase

CEUX

643,998

12.6476

24/08/2026

SAN

Purchase

TQEX

189,866

12.6199

24/08/2026

SAN

Purchase

AQEU

199,342

12.6562

25/08/2026

SAN

Purchase

XMAD

3,600,000

12.6545

25/08/2026

SAN

Purchase

CEUX

1,496,810

12.6185

25/08/2026

SAN

Purchase

TQEX

283,158

12.6458

25/08/2026

SAN

Purchase

AQEU

620,032

12.6313

26/08/2026

SAN

Purchase

XMAD

1,150,000

12.7146

26/08/2026

SAN

Purchase

CEUX

396,403

12.7113

26/08/2026

SAN

Purchase

TQEX

189,241

12.7057

26/08/2026

SAN

Purchase

AQEU

264,356

12.7112

TOTAL

12,800,000

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), 27 August 2026

ANNEX I

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 24/08/2026 and 26/08/2026 (both inclusive)

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