Watching Insider Action for Buy/Sell Signals

NYT: More Often Than Not, the Insiders Get It Right

And there is no evidence, he added, that insiders have lost their ability to tell when their own companies’ stocks are undervalued. In the late 1970s and early ’80s, for example, he found that the average stock bought by an insider outperformed the overall market by three percentage points in the 50 days after the purchase.

For the most recent 10-year period in his sample, through 2008, the comparable 50-day advantage for the insiders was 3.3 percentage points. That’s striking because it includes the bulk of the 2007-9 bear market.

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