Cluster event

A cluster event in congressional trading is defined by Disclosed Capitol as three or more members of Congress trading the same ticker within a 72-hour window. The threshold (3 / 72-hour) is calibrated to filter out coincidental overlap while catching the kind of coordinated activity that historically preceded notable price moves.

Cluster events are weighted by combined dollar volume — a $3M cluster across five members is treated as more significant than a $30K cluster. The five-member-defense-stock cluster is the canonical example: when multiple senators on the Armed Services Committee buy the same defense contractor in the same week, that's the kind of pattern that gets surfaced.

Disclosed Capitol publishes every cluster event in real time to: - The cluster alert email (subscribers can configure) - The /alerts public feed - The per-ticker overlap page

Cluster events do not imply illegality — there are legitimate reasons multiple members might trade the same name (sector rotation, broker advisory, news catalyst). They are however the highest-signal class of congressional-trade pattern available from public data alone.