In Australia, the "big four banks" refers to the four largest banks by market share, who between them hold 80% of the home loan markets in the country. In 2012, their combined total asset is A$2.66 trillion, which is about 200% of Australian GDP in 2011. These are:
Being New Zealand's closest neighbour, with very close ties culturally and economically, has helped Australia dominate the banking sector there. Often referred to collectively as the 'big banks' or the 'big Aussie banks', the "Big Four" Australian banks also dominate the New Zealand banking sector in the form of:
Together they hold over 90% of gross loans and advances in New Zealand  as well as close to 90% of all mortgages.
These four subsidiaries are massively profitable and in some cases even outperform the Australian parent company. The extent to which they dominate the banking sector can be seen in profits: In the 2012/2013 financial year, the largest of the Big Banks, ANZ New Zealand, made a profit of NZ$1.37 billion. The smallest, BNZ, made a profit of NZ$695 million. State-owned Kiwibank, community trust-owned TSB Bank, SBS Bank (formerly Southland Building Society) and Heartland Bank, the next four largest banks by profit, made NZ$97 million, NZ$73.5 million, NZ$14 million and NZ$7 million (albeit with an underlying result of about NZ$30 million) respectively. In other words, the profit of New Zealand's next four largest banks (after the Big Four) is equal to less than 30% of the smallest of the Big Four, BNZ.
Ulster Bank - Subsidiary of The Royal Bank of Scotland Group since 2000/2001.
With the recent announcement that Danske Bank are to reduce their operations in the Republic of Ireland, many in the industry have argued that KBC Bank Ireland have replaced them as part of the Big Four Banks.
^Yao Sui: Chinese Finance History, High Education Publisher in 2007, Beijing. (in Chinese: 《中国金融史》，姚遂主编，高等教育出版社，2007年版)
^"Anglo Irish Bank Corporation (Executive Summary)". SME Financial. Retrieved 2012-01-17 "...The only banks with higher market capitalisation were Allied Irish Banks (AIB) and Bank of Ireland, both with strong retail and commercial presences. Ulster Bank and National Irish Bank are the other members of the ‘Big Four’ retail and commercial banks, both owned by overseas parents and not listed on the Irish Stock Exchange".Check date values in: |accessdate= (help)