This paper lands the effect of information accountant publication on the output of society titles quoted. To fear the Moroccan stock operator behaviour at the time of the financial state announcement, us we are referred, on the methodological plan, to the technique of event survey. Our survey carries on several years 2014 to 2019. Listed companies may be interested in the fact that the publication of their accounting statements generally results in a market reaction. Financial reporting should be an important part of the company's strategy. It is through economic information that it is able to develop healthy and fruitful relationships with its various stakeholders, in particular financial investors.