Utrata wartości aktywów a kształtowanie kursów akcji polskich spółek sektora energetycznego
Relation Between Impairment of Assets and the Shaping of Share Prices of Polish Energy Sector Issuers

Summary/Abstract: Main purpose of this paper is an examination how information about impairment of assests affects on the market valuation of selected issuers listed on Warsaw Stock Exchange. I focused my research on issuers grouped in the sectoral index WIG – Energy. To verificiation of mentioned impact has been used an event study methodology. Based on the abnormal returns, method allows to estimate the importance of various types of information flowing into the market on the shaping of share prices. Obtained results in this way will allow to indicate how the announcement of impairment of assets affects the short-term prices of Energy sector companies. They can pose one factor of investment decision making on Warsaw Stock Exchange. The obtained research results were verified with the non-parametric Wilcoxon matched-pairs test. It indicated the lack of statistical significance of the averaged abnormal returns for each of the days of the event window. Therefore, it should be noted that reporting impairment of assets in the case of issuers grouped in the WIG-Energy index does not cause a statistically significant short-term decrease in their market valuation.

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