The
Borsa Italiana S.p.A., based in
Milan, is
Italy's main
stock exchange. It was privatised in 1997 and is a part of the
London Stock Exchange Group plc since 2007. In 2005, the companies listed on the Borsa were worth US$890 billion. It is also informally known as
Piazza Affari ("Business Square"), after the city square of Milan where its headquarters (the
Palazzo Mezzanotte building) is located.