Overconfident Institutions and Their Self-Attribution Bias: Evidence from Earnings Announcements

Hsin-I Chou, Mingyi Li, Xiangkang Yin and Jing Zhao

Journal of Financial and Quantitative Analysis, 2021, vol. 56, issue 5, 1738-1770

Abstract: Institutional demand for a stock before its earnings announcement is negatively related to subsequent returns. The relation is not attributable to the price pressure of institutional demand and is stronger for stocks with higher information asymmetry and/or greater valuation difficulty. These findings support the notion that overconfident institutions misprice stocks. Following announcements, institutions’ behavior exhibits the outcome-dependent feature of self-attribution bias. Whether they become more overconfident and delay their mispricing correction depends on whether earnings news confirms their preannouncement trades. This behavioral bias also offers a new explanation for the well-known post-earnings-announcement drift.

Date: 2021
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