Westpac Banking Corporation, more commonly known as Westpac, is an Australian bank and financial-services provider headquartered at Westpac Place in Sydney. It is one of Australia's "big four" banks. Its name is a portmanteau of "Western" and "Pacific". It is also Australia’s first and oldest bank, established in 1817.
As of March 2018, Westpac has 14 million customers, and employs almost 40,000 people. Westpac’s vision is to be one of the world’s great service companies, helping customers, communities and people to prosper and grow. In 2017, Westpac was recognised as the most sustainable bank globally in the Dow Jones Sustainability Index; the fourth year in a row.