The change in the DAX will be effective from June 21, the exchange operator said.
The sale of a majority stake in HeidelbergCement by industrial heir Ludwig Merckle last year boosted the group’s free float, helping it meet a basic criterion for entry onto the index.
The revisions are important for index-tracking funds, whose portfolios mirror the composition of an index.
Thanks to a ’Fast Entry Rule’ on the Frankfurt Stock Exchange, a company can enter the DAX index ahead of the stock exchange’s periodic review if it ranks within the 25 biggest companies both in terms of market capitalisation and turnover.