Around 10:15 (08H15 GMT) the title lost 9.33%.
The Italian government has already indicated that it intends to withdraw the concession, at least for the Genoa motorway where a viaduct collapsed over the city and killed 43 people.
Atlantia controls the company Autostrade del Italia, which is concession holder of the site as half of the Italian road network, announced that it is ready to release 500 million euros to help the city and rebuild the bridge.
The specialized site Milano Finanza mentions Monday the possibility of a nationalization of Autostrade per l & # 39; Italia.
A possible nationalization of Autostrade would be "advantageous", because the Italian state, which regains the turnover of this company via toll, assures the Italian Transport Minister Danilo Toninelli in an interview with the Corriere della Sera.
However, the La Repubblica newspaper, referring to a study by Fillea Cgil, the construction trade union, says that this nationalization would cost between € 15.8 and € 18.2 billion and that it would take at least 40 years for the Italian state to depreciate it.