Form4insider filings, from the source

Analytics

Insider buy/sell ratios

Two honest ratios per trading day, computed from open-market filings only: how many buy filings per sale filing, and net dollars as a share of total dollars (+1 all buying, −1 all selling). No index overlay — that needs licensed market data.

1M3M6M1YAll data22 trading days · 1,192 buys / 3,440 sales · $2.92B bought / $17.77B sold
Buy : sale filing-count ratio (1.0 = as many buys as sales)
0.00.20.40.60.81.008-2709-0109-0409-1009-1509-1809-2309-28
Net dollars as a share of total dollars (+1 = all buying)
-1.0-0.50.00.51.008-2709-0109-0409-1009-1509-1809-2309-28
Daily filing countsbuy filingssale filings
05010015020025030008-2709-0109-0409-1009-1509-1809-2309-28
Daily open-market dollarsboughtsold
$0$1.0B$2.0B$3.0B$4.0B08-2709-0109-0409-1009-1509-1809-2309-28

Insiders sell for many reasons (compensation, diversification, taxes) but buy for mostly one. The count ratio typically sits well below 1.0 — its changes are the signal, not its level. Days are trading-day buckets with the 4:00 pm ET cutoff.