This, by definition, cannot be an explanation, because what's in the DAX and what's not is based solely on the numbers of the listed companies. See https://de.wikipedia.org/wiki/DAX#Auswahlkriterien
This, by definition, cannot be an explanation, because what's in the DAX and what's not is based solely on the numbers of the listed companies. See https://de.wikipedia.org/wiki/DAX#Auswahlkriterien