We study how stock price informativeness changes with the presence of highfrequency trading (HFT). Our estimate is based on the staggered start of HFT participation in a panel of international exchanges. With HFT presence market prices are a less reliable predictor of future cash ows and...

This paper addresses the question of how the timing of corporate insider trading is related to the level of information asymmetry in a stock price. Our empirical analysis shows that, when buying their firm's shares, corporate insiders are likely to exploit their informational advantage through...

The paper explores the consequences of SEC detection of illegal insider trading on subsequent insider trading activities. We hypothesize that individuals with private information update their subjective probabilities of getting caught and are less likely to exploit material, non-public...

Do insiders trade on private information about earnings? We address this question exploiting the discontinuity in the term structure of option prices around the announcement date, to obtain a daily and forward-looking measure of the informativeness of the next earnings announcement. This measure...

This paper studies insider trading quantities and dollar profits to measure the benefits insiders extract from their superior information. We find that several empirical results depend critically on using dollar profits instead of percentage returns. Dollar profits are economically small for a...

This paper investigates whether corporate insiders trade when asymmetric information is high, using data on U.S. corporate insider transactions between 1986 and 2012. The key innovation of this paper is our proxy for asymmetric information relivol which measures deviations of idiosyncratic...