 In 1791 he took over a Carmarthen bank established by a person named David Parry and operated it under the name of Morris & Sons

David Morris carried-on his banking business in Dark Gate, Carmarthen.As the business expanded, it moved to a larger house in King Street and finally to Spilman Street, where the bank remained until it was taken over, in 1871.It is likely that David Morris also acquired the Carmarthen Furnace Bank, amalgamating the two banks to form a successful business carried on under the name David Morris & Sons and it was probably after the failure of Carmarthen Bank, which was owned by Waters, Jones & Co., that David Morris & Sons changed its name to Carmarthen Bank.