There was a pretty big insider trading bust today, involving high level executives investor relations firms, and Raj Rajaratnam of the Galleon Group hedge fund. From what I've been able to gather from the charges, I compiled a set of charts for various of the insider trades. It excludes some in stocks that no longer trade publicly (such as Hilton). Judge the charts for yourself. It would be interesting to develop a more systematic study of trading patterns prior to big jumps, and see how insiders show their hands in the form of the stock's price.
The charges appear here.
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