Westpac Banking Corporation, also known as Westpac, is an Australian multinational banking and financial services company headquartered at Westpac Place in Sydney. Established in 1817 as the Bank of New South Wales, it acquired the Commercial Bank of Australia in 1981 before being renamed to Westpac Banking Corporation in 1982. Westpac is one of Australia's Big Four banks, and is Australia's first and oldest banking institution. Its name is a portmanteau of "Western" and "Pacific". As of 2025, Westpac has 13 million customers worldwide, and employs around 35,000 people. Wikipedia