ATAC S.p.A.

ATAC (Azienda Tramvie e Autobus del Comune di Roma) is the principal public transport operator serving the city of Rome. It manages the operation of bus, tram, metro and urban railway lines that form the core of the city’s mobility network. The agency is responsible for scheduling, maintenance and customer information across these modes. In addition to running vehicles, ATAC oversees the integrated ticketing system that allows passengers to transfer seamlessly between services.

ATAC’s service area covers the municipal territory of Rome and extends into the surrounding metropolitan zone. It operates a large number of lines that connect residential neighbourhoods, business districts and major cultural sites. The network provides daily mobility for a substantial portion of the city’s population and visitors.

As a municipal entity, ATAC functions under a public service contract with the Commune di Roma, which defines its obligations for service quality and coverage. The organisation places emphasis on integrated fare structures, real‑time passenger information and efforts to reduce environmental impact. In March 2023, ATAC experienced a distributed denial‑of‑service attack that disrupted its online ticketing portal and official website. Technical teams restored the digital platforms while confirming that bus, tram and metro services continued to operate without interruption, safety concerns, or reported data compromise.

Legally, ATAC is structured as a joint‑stock company (ATAC S.p.A.) whose sole shareholder is the Municipality of Rome. Its headquarters are situated in Italy, reflecting its status as a locally controlled public enterprise. The company’s governance includes a board of directors appointed by the municipal council, ensuring alignment with local transport policy. This ownership model allows ATAC to pursue long‑term infrastructure investments while remaining accountable to the city’s residents and administrators.