Short selling and the price discovery process

• Main Authors: BOEHMER, Ekkehart, WU, Juan Julie
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2013
• Subjects: Informational efficiency of prices; Price discovery; Short selling; Business; Portfolio and Security Analysis
• Online Access: https://ink.library.smu.edu.sg/lkcsb_research/4688; https://ink.library.smu.edu.sg/context/lkcsb_research/article/5687/viewcontent/ShortSellingPriceDiscovery_2013.pdf
• Institution: Singapore Management University

We show that stock prices are more accurate when short sellers are more active. First, in a large panel of NYSE-listed stocks, intraday informational efficiency of prices improves with greater shorting flow. Second, at monthly and annual horizons, more shorting flow accelerates the incorporation of public information into prices. Third, greater shorting flow reduces post-earnings-announcement drift for negative earnings surprises. Fourth, short sellers change their trading around extreme return events in a way that aids price discovery and reduces divergence from fundamental values. These results are robust to various econometric specifications, and their magnitude is economically meaningful.