Pervasive underreaction: Evidence from high-frequency data
62 Pages Posted: 26 Oct 2015 Last revised: 23 Mar 2021
Date Written: March 22, 2021
We propose a novel high-frequency decomposition of daily stock returns into news- and non-news-driven components, and uncover evidence of pervasive stock market underreaction to firm news. Prices tend to drift in the same direction as the initial market response for several days after the news arrival without reversals. A trading strategy exploiting the return drift generates high abnormal returns and remains profitable after transaction costs. To understand the economic mechanism, we find that the return drift is stronger when investors are distracted. Analysts' slow adjustments of market expectations following firm news also contribute to the market underreaction.
Keywords: Underreaction; High-Frequency; News; Attention; Expectation Formation
JEL Classification: G10; G14; G17
Suggested Citation: Suggested Citation