SEC Insider Cluster Buys Scanner

Find stocks where multiple insiders are buying their own company — the "smart money" signal hiding in plain sight in SEC filings.

Corporate insiders sell stock for a hundred reasons: taxes, diversification, buying a house. They only buy on the open market for one reason — they think it's going up. When two or more different insiders buy within the same window ("cluster buying"), academic research has repeatedly found it precedes outperformance, especially in small and mid caps.

This actor scans SEC EDGAR Form 4 filings directly (the primary source, not a delayed aggregator) and flags every ticker in your watchlist with recent cluster buying: who bought, how much, and across how many filings.

What you get

One dataset row per cluster-buy signal:

{
  "ticker": "SOFI",
  "num_insider_buyers": 3,
  "total_open_market_purchases_usd": 1250000.00,
  "buyers": [
    {"name": "NOTO ANTHONY", "purchases_usd": 1000000.00},
    {"name": "LAPOINTE CHRIS", "purchases_usd": 150000.00},
    {"name": "DOE JANE", "purchases_usd": 100000.00}
  ],
  "form4_filings_checked": 14,
  "lookback_days": 45,
  "signal": "CLUSTER_BUY",
  "scanned_at": "2026-08-15T04:30:00Z"
}

Only genuine open-market purchases count (Form 4 transaction code "P") — option exercises, grants, and awards are excluded, so you see conviction, not compensation.

Use cases

• Watchlist screening: run weekly on your portfolio + watchlist; a cluster is a research trigger
• Idea generation: scan a broad universe monthly and see where insiders are quietly accumulating
• Newsletters and Discords: pipe fresh cluster signals into your community content
• Quant research: build a historical panel of cluster events for backtesting

How to use

1. Enter tickers (or use the default watchlist)
2. Set the lookback window (45 days default) and minimum buyers (2 default; set 3 for only the strongest clusters)
3. Add your email (SEC requires a contact in the request header — it goes nowhere else)
4. Run. Schedule it weekly to turn this into a standing screen.

Data comes straight from SEC EDGAR with polite rate limiting. Not investment advice — signals are research candidates, not recommendations.