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New Evidence on the Effects of the Insider Trading Sanctions Act of 1984

Jin Xu

Virginia Tech - Pamplin College of Business

February 20, 2008

This paper analyzes the effects of the Insider Trading Sanctions Act of 1984, the first federal level insider trading statute since 1934 which substantially increased the penalties of illegal insider trading. I find that, around the passage of the Act on July 25, 1984, there were positive abnormal returns for stocks heavily traded by insiders in the past. After the passage of the Act, insider trading frequency decreased significantly and insider trading volume also declined once firm characteristics are controlled for. I also explore insider trading behaviors in merger target firms before the merger announcements between 1979 and 1989 and find a significant decline in abnormal pre-announcement insider net purchases. After the enactment the odds ratio of a positive net insider purchase decreased from 0.08 to 0.04. The price run-up before merger announcements also attenuated after the ITSA enactment. The five-day pre-announcement abnormal return accounted for about 48% of the total price increase before the enactment, but only about 27% after the enactment. Overall, the evidence supports the hypothesis that the ITSA effectively reduced informed insider trading.

Number of Pages in PDF File: 50

Keywords: Insider Trading Sanctions Act, informed insider trading

JEL Classification: G34, G38

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Date posted: March 19, 2008  

Suggested Citation

Xu, Jin, New Evidence on the Effects of the Insider Trading Sanctions Act of 1984 (February 20, 2008). Available at SSRN: https://ssrn.com/abstract=1100641 or http://dx.doi.org/10.2139/ssrn.1100641

Contact Information

Jin Xu (Contact Author)
Virginia Tech - Pamplin College of Business ( email )
Department of Finance
880 West Campus Dr
Blacksburg, VA 24061
United States
HOME PAGE: http://www.finance.pamplin.vt.edu/faculty/jx/index.html
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