Intraday characteristics of stock price crashes

Manuel Ammann and Stephan Markus Kessler

Applied Financial Economics, 2009, vol. 19, issue 15, 1239-1255

Abstract: This article presents the first detailed analysis of the intraday characteristics of idiosyncratic stock price crashes. The analysis focuses on the impact of large crashes in single stocks on their intraday returns and liquidity in the US market. Furthermore, optimal intradaily behaviour during crashes is studied. Crashes are found to happen rather quickly, usually during a time interval of a few hours. In general, a strong increase in trading activity is observed during a crash, indicating that investors are able to sell their stocks even in distressed markets. The level of liquidity change is linked to the size of the crash. However, there is little evidence that the large sales volume during a crash drives down stock prices. After a stock price crash a significant momentum effect is found for several hours. Stock price crashes appear to reduce information asymmetries.

Date: 2009
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DOI: 10.1080/09603100802481804

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