Abstract - The paper investigates the local public transport in Italy taking into account the reality of groups and agreements among firms. The results, obtained through the elaborations done on the AIDA data base, part of the Bureau Van Dijck, on 484 firms for the year 2007, allow a more accurate description of the real concentration of the local public transport market, which appears to be sensibly higher than usually assumed. Our results are so far merely descriptive, but they may bear policy implications, as local authorities responsible of transport policies shouldn’t disregard the links connecting firms, while defining the transport basins or choosing the local provider.