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Stock Price Reaction to News and No-News: Drift and Reversal After Headlines

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Submitted By mrjulia2003
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Stock Price Reaction to News and No-News:
Drift and Reversal After Headlines
Wesley S. Chan∗
M.I.T.
First Draft: 8/28/2000
This Draft: 5/11/2001

Abstract
I examine returns to a subset of stocks after public news about them is released.
I compare them to other stocks with similar monthly returns, but no identifiable public news. There is a major difference between return patterns for the two sets. I find evidence of post-news drift, which supports the idea that investors underreact to information.
This is strongest after bad news. I also find some evidence of reversal after extreme price movements that are unaccompanied by public news. The patterns are seen even after excluding earnings announcements, controlling for potential risk exposure, and other adjustments. They appear, however, to apply mainly to smaller stocks. I also find evidence that trading frictions, such as short-sale constraints, may play a role in the post-bad-news drift pattern.



I wish to thank Kent Daniel, Ken French, Li Jin, S. P. Kothari, Jon Lewellen, Andrew Lo, Sendhil Mullainathan, Dimitri Vayanos, and Geoffrey Verter for many stimulating discussions, and the members of the MIT
PhD Finance seminar for their helpful comments. Please address all correspondence to me at wschan@mit.edu.

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Introduction

There is a large amount of evidence that stock prices are predictable. In the last decade, various studies have shown that stock returns exhibit reversal at weekly and 3-5 year intervals, and drift over 12-month periods.1 Some research shows that stock prices appear to drift after important corporate events for up to several months.2 This suggests that some of the drift is driven by underreaction to information. However, there are also numerous days when financial markets move dramatically, but without any apparent economic news or

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