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REG — Banco Santander S.A. — Buyback programme: transactions 17 — 23sept

For best results when printing this announcement, please click on link below: RNS Number: 1843W Banco Santander S.A. 24 September 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 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 th

SAN.MC

A. 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.

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). 2% of the maximum investment amount of the Buyback Programme. The programme was announced together with its other characteristics through the Buyback Commencement Communication. 3% of its outstanding shares as of 2021.

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) This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom.

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