Banco Santander, Spain’s largest bank by market capitalization, has disclosed holding approximately $4.3 million in US-listed spot Bitcoin ETFs. The position appears in the bank’s regulatory filings, earning it a score of around 35% on the 2026 Bitcoin Bank Adoption Index, placing it in the middle tier alongside institutions like Société Générale. The bank’s digital subsidiary, Openbank, began offering crypto trading services to clients in Germany in September 2025, with expansion to Spain planned. This move is part of a measured integration strategy, as the bank has been developing crypto custody and digital asset capabilities across Europe for several years.
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