Clydesdale Bank is a commercial bank in Scotland. Formed in Glasgow in 1838, it is the smallest of the three Scottish banks. Independent until it was purchased by Midland Bank in 1920, it formed part of the National Australia Bank Group (NAB) between 1987 and 2016. Clydesdale Bank was divested from National Australia Bank in early 2016 and its holding company, CYBG plc, trades on the London and Sydney stock exchanges.