the commonwealth bank of australia (cba), or commbank, is an australian multinational bank with businesses across new zealand, asia, the united states and the united kingdom. it provides a variety of financial services including retail, business and institutional banking, funds management, superannuation, insurance, investment and broking services. the commonwealth bank is the largest australian listed company on the australian securities exchange as of august 2015 with brands including bankwest, colonial first state investments, asb bank (new zealand), commonwealth securities (commsec) and commonwealth insurance (comminsure). commonwealth bank is also the largest bank in the southern hemisphere.