11 September 2001: -7.57% - Attack on the Twin Towers

Piazza Affari fell 7.57% following the terrorist attacks in the US. These events triggered a wave of panic in global financial markets, causing significant losses in the major European stock exchanges. In particular, Frankfurt lost 10%, Paris 7.4% and London 5.4%. The prolonged closure of Wall Street contributed to the uncertainty, negatively affecting investors. Moreover, the economic environment was already fragile due to the bursting of the dot-com bubble, further aggravating market reactions.