About National Australia Bank: We exist to serve our customers and help our communities prosper. We’re focused on what matters most and here to support you with your banking needs in any way we can. National Australia Bank is one of the four largest financial institutions in Australia in terms of market capitalisation, earnings and customers. NAB was ranked 21st-largest bank in the world measured by market capitalisation and 52nd-largest bank in the world as measured by total assets in 2019.