Abstract

This paper tests the market reaction and the stock price change around rating announcements in Tunisian stock exchange using the event study methodology. We examine the impact of the change rating announcement on stock return firms from 2006 to 2010. The results show that only the negative rating with downgrades note which is associated to negative abnormal return. The market does not seem to be interested upgrades rating on the Tunisian market. The negative reaction of the market can be explained by leverage change, Book to Market ratio and the level of the rating fall.

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