Insider Trading and Analyst Coverage: Testing the crowding out hypothesis and its implications on market efficiency
Sammanfattning: In this paper we study the relationship between insider trading and analyst coverage and test the hypothesis that insiders crowd out analysts in order to examine the effects of insider trading on market efficiency. The study is based on insider transactions taking place on the OMX Stockholm Stock Exchange between 1997 and 2007 and the impact of insider trading on analyst coverage is tested at the firm-wide level through zero-inflated Poisson (ZIP) and Tobit regressions including analyst coverage as the dependant variable and insider trading as an explanatory variable. Variables that in previous research have been proven to affect analyst coverage, such as firm size, liquidity and ownership structure, are also included as explanatory variables. We find evidence of a significant, negative relationship between insider trading and analyst coverage, indicating that insider trading has signaling effects.
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