Insider trading screener

How this screener works

This screener lists SEC Form 4 insider transactions and lets you filter by filing window, insider role, minimum trade value, market cap, sector and disclosed 10b5-1 status. Each row links to the original SEC filing so you can confirm the transaction before acting on it.

How the cluster score is calculated

The 0–100 cluster score in the results table adds four components, capped at 100: breadth (15 points per distinct open-market buyer in the trailing 30 days, capped at 45), recency (20 points if the most recent purchase was under 7 days old, 15 under 14 days, 10 under 30 days, 0 otherwise), size (up to 25 points based on total purchase value as a percentage of market capitalization, at thresholds of 0.05%, 0.25%, 0.5% and 1%), and seniority (10 points if a CEO is among the buyers, 7 for another officer, 5 for a director).

Worked example

Suppose a company has 3 distinct insiders buying on the open market in the trailing 30 days, including the CEO, with a most recent purchase filed 5 days ago, total purchase value of $600,000 against an $80,000,000 market cap. Breadth: 3 × 15 = 45 (at the 45-point cap). Recency: under 7 days = 20. Size ratio: $600,000 ÷ $80,000,000 = 0.75%, which is above the 0.5% threshold = 25. Seniority: CEO present = 10. Total: 45 + 20 + 25 + 10 = 100, the maximum score.

Assumptions and limits

The score only counts codes classified as open-market or private purchases, so it excludes stock awards, option exercises and tax-withholding sales. Market-cap ratios use whatever market snapshot is loaded and may lag the filing date. A 10b5-1 flag reflects only what the filer disclosed in the filing; an unchecked flag does not prove no plan exists.

When to use this

Use the screener and score as a starting point for further reading of the original filings, not as a standalone buy or sell signal. A high score describes concentrated, recent, senior buying; it says nothing about valuation or future returns.

Common mistakes

Treating any Form 4 with an acquisition code as a cash purchase (many are option exercises or awards); ignoring the direct/indirect ownership distinction; comparing purchase dollar amounts across companies without adjusting for market cap; and treating a disclosed 10b5-1 plan as proof the purchase was not discretionary in intent.

Related guides and tools

• Form 4 transaction codes explained
• Cluster buying screen
• Full scoring methodology
• Data coverage and freshness

Sources

• SEC Form 4 (official form and instructions)
• SEC EDGAR full-text search