Heidelberg Cement will probably join the blue-chip Dax index of the Frankfurt Stock Exchange in June, according to estimations of experts.

Under the "fast entry" rule provides for making changes to the indices not only on September 30, Heidelberg Cement may enter Dax if it is among the 25 biggest listed German companies in terms of market value of its free float and volume of traded shares. The company with the weakest ratios will drop out of the index. Currently, it is Salzgitter.

Analysts expect Heidelberg Cement to have met the criteria for a Dax entry by the end of May.