Illegal insider trading has become front-page news in recent years. High profile court cases have brought to light the extensive networks of insiders surrounding well-known hedge funds, such as the Galleon Group and SAC Capital. Yet, we have little systematic knowledge about these networks. Who are inside traders? How do they know each other? What type of information do they share, and how much money do they make? Answering these questions is important. Augustin, Brenner, and Subrahmanyam (2014) suggest that 25% of M&A announcements are preceded by illegal insider trading. Similarly, the U.S. Attorney for the Southern District of New York believes that insider trading is “rampant.”
In my paper, Information Network: Evidence from Illegal Insider Trading Tips, which was recently made publicly available on SSRN, I analyze 183 insider trading networks to provide answers to these basic questions. I identify networks using hand-collected data from all of the insider trading cases filed by the Securities and Exchange Commission (SEC) and the Department of Justice (DOJ) between 2009 and 2013. The case documents include biographical information on the insiders, descriptions of their social relationships, data on the information that is shared, and the amount and timing of insider trades. The data cover 1,139 insider tips shared by 622 insiders who made an aggregated $928 million in illegal profits. In sum, the data assembled for this paper provide an unprecedented view of how investors share material, nonpublic information through word-of-mouth communication.