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An empirical study of impact of inclusion and exclusion from an Index on stock prices
Vellechová, Karolína ; Vozárová, Pavla (advisor) ; Fanta, Nicolas (referee)
This thesis studies the effect of index components changes on the stock prices of added and deleted components. Specifically, the thesis follows two market indexes from Western Europe, CAC 40 and DAX 30, in the period from financial crisis in 2008 to 2020. The theory of Efficient Market Hypothesis suggests that index components change should not impact firm's price, because the index membership is supposed to have no new information, the findings of various researchers found out the opposite. There are several hypotheses, which try to explain these effects. In this thesis three methods were used to estimate the effect of addition and deletion, these were abnormal return, abnormal trading volume and close open difference calculation. The results obtained by all three methods were mostly consistent with the results of previous studies of the US indexes. The calculation of abnormal volume reported significant and expected results for both indexes, which suggested that the day before the change has the highest abnormal volume. Also, the results for close open differences discovered expected pattern, that the highest change happens usually on the day after announcement, which informs about how fast investors reply to index change. The abnormal returns for the CAC 40 index show expected significant...
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