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Banco Santander, S.A. disclosed purchases of 20,457,881 own shares under its Buyback Programme between 12 and 18 March 2026 across XMAD, CEUX, TQEX, and AQEU trading venues, with weighted average prices from 9.5315 to 9.6919 Euros. Cumulative cash expended reached 2,140,850,510 Euros, or 42.6% of the maximum programme amount, equating to approximately 16.5% of outstanding shares as of 2021.