A version of my full empirical research on insider outperformance can be read here.
Insiders are the executive managers and directors who are in front of the financial and strategic decision making of their firm.
Insider trading activity is very informative to follow because their trades tell us something about the valuation of a stock as insiders know their business better than anyone else.
As a consequence of having performed months of empirical research on insider outperformance, having read all papers covering the topic and having written a paper myself, my knowledge on this