Overnight Returns and Firm-Specific Investor Sentiment

We explore the possibility that overnight returns can serve as a measure of firm-specific investor sentiment by analyzing whether they exhibit characteristics expected of a sentiment measure. First, we document short-term persistence in overnight returns, consistent with existing evidence of short-term persistence in share demand of sentiment-influenced retail investors. Second, we find that short-term persistence is stronger for harder-to-value firms, consistent with evidence that sentiment plays a larger role when there is less objective data available for valuation. Third, we show that stocks with high (low) overnight returns underperform (outperform) over the longer-term, consistent with evidence of temporary sentiment-driven mispricing