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People ranked by the result of their open-market purchases against the S&P 500, 90 days after each was reported on Form 4: the median purchase (equal weight) or per dollar disclosed (by size). Only people with at least 10 measured purchases are listed, and corporate holders are left out.
Open-market insider purchases · measured against the S&P 500
Rebuilt Nov 14, 2026. Each purchase is measured from the first close after it was reported, against the S&P 500 (SPY), with every purchase weighted equally by default.
For each purchase an insider disclosed, the reference is the first close after the filing date (what anyone reading it could have seen). The result is the stock’s move over the next 30, 90 or 180 days minus the S&P 500’s (SPY) over the same days, from split-adjusted closes. People are ranked by the median 90-day result, and only those with at least 10 purchases old enough to be measured are listed. The “Mirror” puts the same $1,000 after each purchase disclosed in the last 12 months and values it at the latest close, next to the same stakes in SPY.
Two weightings are offered. Equal weight: every purchase counts once, and the figure is the median. By size: every purchase counts for its disclosed dollars, and the figure is the average per dollar, so a large purchase moves it more than a small one. In the Mirror by size, the same total is split in proportion to the size of each purchase.