From Traderpedia

Definition: An index comprising the thirty largest and most actively traded German companies that are listed on the Frankfurt Stock Exchange.

The DAX 30 Index reflects the German blue chip segment.

[edit] History

It was established as the benchmark German index in 1959 when it took over from the Borsen-Zeitung Index. Only the publicly available or "free float" stock issued is taken into account when assessing companies for inclusion in the index.

[edit] Calculation

The DAX is a total return index in so far as it represents the value of the dividend payments as well as the price of its constituents.