What this shows: the dollar-weighted ratio of open-market insider purchases to total open-market activity (purchases + sales) across a 97-company technology universe, aggregated by ISO week. Each week v = P$ / (P$ + S$), where P$ and S$ are the summed dollar values of every Form 4 transaction coded P (open-market purchase) and S (open-market sale). All other transaction codes (M, F, G, J, U, …) — option exercises, tax withholdings, gifts — are excluded. The green line marks the BUY ZONE at 0.05. Readings above the BUY ZONE mean insiders are net buyers on a dollar-weighted basis.

Top panel: weekly closes of XLK (Technology Select Sector SPDR Fund, Yahoo Finance) for context — the price the insiders are trading against.

Reading the chart: zoom in (scroll / shift+drag) to isolate individual weeks; the two panels share one time axis. Data may be revised as filings are amended. Sources: chart data (JSON) · weekly source series (CSV) · SEC EDGAR Form 4