(Vienna) Today's review of the Austrian stock indices results in a change in the composition of the ATX five as well as new free float factors for two Austrian stocks. The composition of the national index ATX remains unchanged. Andritz AG will replace voestalpine AG in the ATX five due to the higher free float capitalization. The free float factor of S Immo AG decreases from 0.6 to 0.3 according to major holdings notifications (CPI PROPERTY GROUP S.A. increased its stake). Flughafen Wien AG's free float factor will be lowered from 0.2 to 0.1 following acquisitions by Airports Group Europe S.à r.l.. The free float factor expresses how many of a company's shares are held by the public and influences its weighting in the index. All changes will be effective as of 19 September 2022. The composition of Austrian indices will be reviewed again in March 2023, the free float factors on 6 December 2022.
The calculation of the ATX is based on a purely quantitative procedure. According to “The Rules for the Austrian Indices of the Vienna Stock Exchange”, the inclusion or exclusion of stocks from the Austrian indices is reviewed twice a year (March and September). Decisions on new additions to the index are based on average daily trading volumes and the free float capitalization of companies. The Vienna Stock Exchange reviews the calculation parameters (number of shares, free float factors, representation factors) of the index on a quarterly basis. Once a month, the ATX watchlist is published. Representatives of institutional investors, financial institutions that issue financial products on the indices, trading members of the Vienna Stock Exchange, academics advisors and the Vienna Stock Exchange contribute their know-how to the Index Committee, which approves the index rules. A list of the Committee members is available online.
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