The SDAX (derived from small-cap DAX) is a German stock index, which was introduced on 21 June 1999 by Deutsche Börse AG. He is the selection index for 50 smaller companies, or small caps that follow the values ​​contained in the MDAX in terms of turnover and market capitalization. The rule here is the 110/110-Regel, that is only listed companies that belong on these criteria, each of the 110 largest behind the Dax may be included. The same criteria apply when they are missed or longer strong, for exclusion from the SDAX. The value selection is reviewed quarterly in early March, June, September and December.

The basis of assessment of the SDAX is December 30, 1987 with a value of 1000 points.

Until June 24, 2002 (see web link to the historical index composition) of the SDAX included the 100 most important companies in the SMAX segment. As part of the redesign of the SDAX index was reduced in March 2003 to 50.

In addition to the DAX, MDAX, the Nasdaq and SDAX part of the Prime Standard.

The SDAX based on the prices of the electronic trading system Xetra. Calculation commences trading day at 09:00 CET clock and ends with the prices from the Xetra closing auction that starts at 17:30 CET clock. Between 17:45 clock to 20:00 clock CET the German Börse calculates the L- SDAX. This late- index is an indicator of the performance of the German small caps after the Xetra trading end.


The following table shows the SDAX index associated companies and their weighting in the SDAX as of March 24, 2014. The table contains the data, as published by Deutsche Börse and authoritative are for weighting the SDAX. In particular, the market capitalization is based only on the detected by Deutsche Börse free float, not the total number of shares. The market capitalization does not correspond here to the market value of all shares of the company, but only the market capitalization of the free float.