Do Insider Trading Laws Work?
AbstractBy calculating an estimated measure of undetected insider trading, this paper shows that profits made by informed corporate insiders prior to tender offer announcements increase after the first enforcement of insider trading laws. I analyze the effects of Insider Trading regulation on a sample of 5,099 acquisitions in 56 different countries, and estimate the profits due to insider trading from the abnormal volume in the weeks prior to the announcement, under the assumption that insiders purchase those shares at the prevailing price and hold them until the public announcement. I find that laws that prosecute insider trading fail to eliminate profits made by insiders, and make acquisitions more expensive. Therefore, by increasing the market reaction to an acquisition, insider trading laws make it profitable to violate them.
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Bibliographic InfoPaper provided by Yale School of Management in its series Yale School of Management Working Papers with number ysm162.
Date of creation: 01 Nov 2000
Date of revision: 01 Jun 2005
Insider trading; takeovers; market regulation;
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