Its shares, 52.7% of them owned by the Swiss cantons and cantonal banks, are listed on the Swiss stock exchange.

ECONOMIST: The Swiss National Bank

Switzerland's other major bank, Credit Suisse - with over a trillion dollars in total assets and another trillion in clients' money - remains under investigation by the US authorities, as does another high profile bank, Julius Baer, which is about a fifth of the size of Credit Suisse, as well as 11 other mainly local, cantonal banks.

BBC: Swiss bank Wegelin to close after US tax evasion fine