As a result of the semi-annual review of the Austrian indices by the Index Committee, the following changes will take effect on 21 September: Mayr-Melnhof Karton AG returns to Austria’s benchmark index ATX after one year, replacing SBO AG. Two key criteria are decisive for inclusion in the ATX: average daily share turnover (liquidity) and free float capitalisation of the company. In the ATX five, which comprises the five highest-weighted stocks in the ATX, Raiffeisen Bank International AG will be added to the index, replacing voestalpine AG.
In addition, the index review resulted in a change in the free float factor for Semperit AG Holding, which will be reduced from 0.4 to 0.3. The free float factor reflects the weighting of the free float – i.e. the proportion of freely tradable shares – in the indices of the Vienna Stock Exchange. Shareholdings of less than 4% are considered free float. The higher the free float and thus the factor, the greater the weight of the stock in the index. The next scheduled review of the composition of Austrian indices will take place in March 2027. The calculation parameters will be updated again in December 2026.
