Abstract
The main purpose of this paper was the examination how the announcement report including information about assets write off has an influence on the market values joint stock companies. To this end applied an event study methodology created by Fama. Research has been performed by the case of industry companies listed on Warsaw Stock Exchange. For each announcement of these companies between 2013 and 2018 was made seven-day event window whereby counted day abnormal returns. The results of the calculation have indicated statistically significant values (confirmed by Wilcoxon signed-rank tests and modified t test) of abnormal returns in the day of announcement and the next day. That may be provide proofs that impairment of assets has a influence on short term returns of public companies. In the next days (until fifth day after announcement) of event window results do not show correlations.
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