ATM SPA is an Italian Transport Operator based in Ravenna. They are running 150 buses with a 25 million lira turnover and 240 employees.

A new ticketing system (STIMER) is implemented in 2009. It is a regional project and one of the first multi-operators system to be installed in Italy and it will be based on the Calypso technology. 

By joining  Calypso Networks Association ATM SPA wants to be involved in the development process and to be well informed about evolution and new applications especially on the multiservices and payment methodologies.