Bank Systems & Technology: Banco Santander in Mexico has awarded Wincor Nixdorf the service contract for its nearly 4,000 ATMs. Santander is one of Mexico's four largest banks while its Madrid-based parent, with $1.23 trillion in assets, is Europe's biggest and the world's ninth-biggest bank.Wincor Nixdorf will service Santander's Mexican ATMs from an office in Mexico City, and has established a new center there and in Monterrey.