The HDAX is an equity index calculated by Deutsche Börse. It summarizes the values ​​of all 110 companies from the German DAX, MDAX and Nasdaq together. He has over the German benchmark DAX index a broadened, cross-industry basis. It includes the largest values ​​from the Prime Standard of the German stock exchange.

The HDAX (ISIN DE0008469016, WKN 846 901 ) is the successor index of DAX100, (before reduction of the MDAX ) once comprised the 30 DAX stocks and the 70 MDAX. The history of HDAX was supplemented by that of the DAX100; the index has been normalized to a base value of 500 as of 30 December 1987.