Caixa Galicia is a major Spanish bank that has used IBM System z mainframes for over 40 years. The mainframes have enabled the bank to dramatically grow through acquisitions, launch innovative products, automate transactions, and achieve industry-leading low transaction costs. This case study examines how Caixa Galicia's world-class IT infrastructure, centered around the mainframes, has positioned it for continued success as the banking industry consolidates in Spain. Key executives explain how strategic investments in innovation and IT research have driven the bank's technological leadership among Spanish savings banks.