Germany 40 index futures CFD, which is based on the DAX index futures, tracks the 40 largest companies with the highest trading volume on the Frankfurt Stock Exchange. It is considered a highly popular financial instrument among day traders. Germany 40 is a capitalisation-weighted index, meaning its value is determined by summing up the components of the index based on the market capitalisation of their freely tradable shares, and then dividing that figure by the total number of companies. As a result, large-size companies in the index have a higher impact on the price then small-size companies.