Banco Santander S.A.

Transaction in Own Shares • Dec 4, 2025

National Storage Mechanism | Additional information

RNS Number : 2979K

Banco Santander S.A.

04 December 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 27 November and 3 December 2025 (both inclusive).

The cash amount of the shares purchased to 3 December 2025 as a result of the execution of the Buyback Programme amounts to 1,437,943,994 Euros, which represents approximately 84.6% 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 15.1% of its outstanding shares as of 2021.

Date	Security	Transaction	Trading venue	Number of shares	Weighted average price (€)
27/11/2025	SAN	Purchase	XMAD	1,710,697	9.2196
27/11/2025	SAN	Purchase	CEUX	121,426	9.2298
27/11/2025	SAN	Purchase	TQEX	24,635	9.2342
27/11/2025	SAN	Purchase	AQEU	43,242	9.2193
28/11/2025	SAN	Purchase	XMAD	1,311,569	9.2332
28/11/2025	SAN	Purchase	CEUX	92,748	9.2347
28/11/2025	SAN	Purchase	TQEX	39,940	9.2361
28/11/2025	SAN	Purchase	AQEU	55,743	9.2403
01/12/2025	SAN	Purchase	XMAD	1,877,422	9.2446
01/12/2025	SAN	Purchase	CEUX	128,253	9.2362
01/12/2025	SAN	Purchase	TQEX	26,350	9.2375
01/12/2025	SAN	Purchase	AQEU	67,975	9.2401
02/12/2025	SAN	Purchase	XMAD	1,772,623	9.4259
02/12/2025	SAN	Purchase	CEUX	144,082	9.4300
02/12/2025	SAN	Purchase	TQEX	30,579	9.4240
02/12/2025	SAN	Purchase	AQEU	52,716	9.4309
03/12/2025	SAN	Purchase	XMAD	1,855,974	9.4422
03/12/2025	SAN	Purchase	CEUX	128,122	9.4530
03/12/2025	SAN	Purchase	TQEX	38,918	9.4405
03/12/2025	SAN	Purchase	AQEU	76,986	9.4527
			TOTAL	9,600,000

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), 4 December 2025

ANNEX I

Detailed information on each of the transactions carried out within the context of the Buy-back Programme between 27/11/2025 and 03/12/2025 (both inclusive)

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