New edition of the annual survey of 2,120 leading Italian companies which account for 48% of the aggregate sale of Italian manufacturing firms employing twenty or more staff. The survey also includes data for the leading companies operating in the public services, transport and distribution sectors. Aggregates are compiled on the basis of earnings results, balance-sheet data and other key indicators (capex, capital increases, dividends, exports, headcount, etc.). The aggregates are available by ownership (state-owned and private enterprises, non-Italian-owned companies), size (fourth capitalism) and sector of activity. The financial years covered by the survey run from 2010 to 2019. Historical series of data are provided for 980 companies, with data going back to 1968. The introduction contains a discussion of some of the main aspects.