Basically they were keeping history of buys and sells to try to find anomalies in individual insider’s activity.
Well, if these "anomalies" could indeed generate a big trading edge for the traders (like 20% return a year or more, with, say 5% maximum drawdown) these services would simply keep the info to themselves and quietly profit from it, don't you think?

In any case, the most important question is this : when Joe Insider buys tons of shares of XYZ company, how does the stock react?
Does the price go up (or down) after X days or weeks?
What is the typical increase in percentage, if any?
What is the average maximum drawdown in % before this (hypothetical) increase?
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