Does Insider Trading Really Move Stock Prices?

Sugato Chakravarty () and John J. McConnell

Journal of Financial and Quantitative Analysis, 1999, vol. 34, issue 2, 191-209

Abstract: Prior studies have reported a positive correlation between insider trading and stock price changes implying that insider (i.e., informed) trades affect price discovery differently than non-insider (i.e., uninformed) trades. Based on these results, various scholars have argued for the legalization of insider trading to facilitate rapid price discovery. We analyze the trading activity of a confessed inside trader, Ivan Boesky, in Carnation's stock just prior to Nestle's 1984 acquisition of Carnation, and find that our tests are unable to distinguish the price effect of Boesky's (i.e., informed) purchases of Carnation's stock from the effect of non-insider (i.e., uninformed) purchases. Our conclusion survives extensive robustness tests and has methodological and public policy implications.

Date: 1999
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Working Paper: Does Insider Trading Really Move Stock Prices? (1998)
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