With over 100 years of history, Atac is Rome's municipal utility for public transport services and Italy's leading urban mobility operator, as well as being one of the largest Local Public Transport companies in Europe.

From the historical centre to the outskirts, Atac’s network covers a territory of about 1,300 km2: 15 operational sites among workshops and vehicle depots, over 8,200 bus, tram and metro stops, more than 300 surface terminals, 2,750 validators that allow contactless payment on the entire transport network, around 88,000 parking stalls (on-street and in park&ride car parks), over 2,000 Pay&Go and Pay&Go+ parking meters with digital payment - all integrated into a historical framework built over thousands of years - merge into a complex industrial and citizen services system. Atac carries over 940 million passengers per year (pre-pandemic data), of which around 3 million residents, as well as commuters, city users and tourists (over 58 million per year).

With approximately 10 thousand employees, Atac operates a fleet of over 2,000 vehicles - buses, trams, trolleybuses, electric vehicles and metro trains. In addition to its official website atac.roma.it, the company has an active presence on all the main social channels.