Buy Clusters — ≥2 insiders, same stock, last 14 days
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Trade date
Ticker
Insider
Role
Shares
Price
Value
Did It Work? — before & after every purchase
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Average abnormal return after following a purchase (buy at filing-day close, vs SPY)
Event Tracker — following each buy forward
Filed
Ticker
Insider
10d before
Since filing
+5d
+20d
Status
What this is. US corporate insiders (officers, directors, 10% owners) must report
their trades on SEC Form 4 within 2 business days. This feed shows only
open-market purchases (transaction code P) — the rare, deliberate act of an insider
spending their own cash — and ignores sales, which are usually diversification or
compensation noise. Clusters (several insiders buying the same stock at once) are the
signal with the strongest academic support.
Honest limits: the feed updates when the collector pushes (timestamp top-right),
not tick-by-tick; filings themselves lag trades by up to 2 days; and insider buying is a
slow, statistical tendency, not a trade trigger. Educational only — not investment
advice.
2026-08-05 correction: cluster dollar totals before this date were inflated by
duplicate feed rows (observed up to 123×) and could include IPO/placement
allocations. Totals are now summed over deduplicated filings, count open-market buying
only, and show placement/offering dollars separately. Dollar history before 2026-08-05
is not comparable.