This paper shows that firm-specific uncertainty as measured by the estimated conditional idiosyncratic volatility (Eivol) is the most significant determinant of the initial market reaction to revisions in analysts’ recommendations. The mean three-day abnormal return following recommendation downgrades among the firms in the highest Eivol decile is -7.90%, as compared to -1.26% for the firms in the lowest Eivol decile. Similarly, for upgrades, the highest and the lowest Eivol deciles of stocks earn 5.22% and 1.29% three-day abnormal returns, respectively. This result is robust to controlling for firm size, book-to-market, systematic risk, past return performance, and lagged idiosyncratic volatility. This paper further shows that the higher perceived value of information provided by all-star analysts is significant in all Eivol groups, and that it is significantly related to the level of Eivol for downgrades. Finally, we find that the herding among analysts is greater for stocks with higher conditional idiosyncratic volatility. Overall, the finding that revisions are perceived to be more valuable for firms with greater firm-specific uncertainty is consistent with the notion that analysts mostly provide firm-specific information.
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