Banco Santander S.A.

Transaction in Own Shares • Oct 30, 2025

National Storage Mechanism | Additional information

RNS Number : 5226F

Banco Santander S.A.

30 October 2025

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 30 July 2025 (official registry number 2844 ) (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 23 and 29 October 2025 (both inclusive).

The cash amount of the shares purchased to 29 October 2025 as a result of the execution of the Buyback Programme amounts to 940,924,644 Euros, which represents approximately 55.3% 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 14.8% of its outstanding shares as of 2021.

Date	Security	Transaction	Trading venue	Number of shares	Weighted average price (€)
23/10/ 2025	SAN	Purchase	XMAD	2,118,440	8.4210
23/10/ 2025	SAN	Purchase	CEUX	159,694	8.4249
23/10/ 2025	SAN	Purchase	TQEX	83,569	8.4228
23/10/ 2025	SAN	Purchase	AQEU	38,297	8.4288
24/10/ 2025	SAN	Purchase	XMAD	2,661,005	8.3605
24/10/ 2025	SAN	Purchase	CEUX	84,491	8.3771
24/10/ 2025	SAN	Purchase	TQEX	28,921	8.3664
24/10/ 2025	SAN	Purchase	AQEU	25,583	8.3698
27/10/ 2025	SAN	Purchase	XMAD	1,991,538	8.4883
27/10/ 2025	SAN	Purchase	CEUX	125,959	8.4894
27/10/ 2025	SAN	Purchase	TQEX	38,574	8.4843
27/10/ 2025	SAN	Purchase	AQEU	43,929	8.4824
28/10/ 2025	SAN	Purchase	XMAD	1,778,122	8.5525
28/10/ 2025	SAN	Purchase	CEUX	139,178	8.5596
28/10/ 2025	SAN	Purchase	TQEX	51,772	8.5669
28/10/ 2025	SAN	Purchase	AQEU	30,928	8.5591
29/10/ 2025	SAN	Purchase	XMAD	2,650,000	8.8300
29/10/ 2025	SAN	Purchase	CEUX	273,706	8.7894
29/10/ 2025	SAN	Purchase	TQEX	88,482	8.8204
29/10/ 2025	SAN	Purchase	AQEU	187,812	8.8057
			TOTAL	12,600,000

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),30 October 2025

ANNEX I

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 23/10/2025 and 29/10/2025 (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. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact [email protected] or visit www.rns.com.

RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our Privacy Policy.

END

POSMMBBTMTMJBIA