Santander plans to acquire Banesto's minority shareholders in a merger valued at approximately €2.6 billion, offering a 25% premium over Banesto's closing price, with completion expected by May 2013. The merger aims to achieve annual synergies of €520 million in three years through cost reductions and improved revenue by integrating operations and resources. The transaction is positioned as beneficial for shareholders of both banks, enhancing product offerings and market presence while addressing challenges in the Spanish financial sector.