SEC Form 4 Insider Buying - Cluster Signal Scanner

Find clusters of insider open-market buying from SEC Form 4 filings - scored and ranked for research and screening. When multiple company insiders (CEO, CFO, directors) buy their own stock within a short window, it's a widely studied pattern in quantitative-finance research. This Actor scans real-time SEC EDGAR Form 4 filings, groups open-market purchases by company, and returns ranked, scored insider buy clusters - not a raw data dump.

Insider cluster buying has a larger price impact than isolated insider buys. This Actor surfaces those clusters automatically.

Real example (from live SEC data): AADX - 4 insiders including the CFO bought $1.17M of stock on the same day -> score 71.7 (MODERATE). That is the kind of pattern this Actor surfaces for you, ranked and scored.

Why this is different

Most insider-trading scrapers give you raw Form 4 rows - every grant, tax-withholding and option exercise mixed together - and leave the analysis to you. This Actor delivers the signal:

• Filters to open-market purchases only (transaction code P) - the buys most relevant for screening.
• Detects clusters: ≥ N different insiders buying the same stock within your lookback window.
• Scores each cluster 0-100 (with a STRONG / MODERATE / WEAK label) by number of insiders, total USD value, and seniority (a CEO/CFO buy weighs more than a junior officer).
• Returns clean, ranked JSON ready for your dashboard, model or alert.
• Includes a sec_url with every cluster, so you can verify the raw filings on SEC EDGAR in one click.

A self-serve, pay-per-result alternative to premium platforms like InsiderScore and Fintel (which run $99-$499/month).

Who it's for

• Retail quants & algo traders - a ready-made insider-buying dataset for research and screening.
• Fintech & trading apps - drop scored insider signals into your product.
• Research & newsletters - surface notable insider clusters daily.

Input

Field	Type	Default	Description
daysLookback	integer	3	Trading days of Form 4 filings to scan.
minInsiders	integer	2	Minimum distinct insiders buying the same stock to count as a cluster.
minClusterValue	integer	0	Only return clusters worth at least this much (USD).
maxFilings	integer	500	Upper bound on filings scanned (controls run time & cost).

Output

Each item is one scored insider-buy cluster:

{
 "ticker": "AADX",
 "issuer": "Applied Aerospace & Defense, Inc.",
 "cik": "0002118195",
 "num_insiders": 4,
 "total_value": 1170000.0,
 "num_buys": 4,
 "avg_seniority": 0.6,
 "score": 71.7,
 "label": "MODERATE",
 "buys": [
 { "owner": "McRae Jeffrey L.", "role": "Chief Financial Officer",
 "shares": 25000, "price": 20.0, "value": 500000.0, "date": "2026-06-04" },
 { "owner": "Katzman James C", "role": "Director",
 "shares": 25000, "price": 20.0, "value": 500000.0, "date": "2026-06-04" }
 ]
}

(Real cluster detected by this Actor in live SEC data: 4 insiders incl. the CFO bought $1.17M of the same stock on the same day.)

How the score works (transparent)

score = insiders (up to 55 pts) + log10(total $) (up to 30 pts) + seniority (up to 15 pts)
labels: STRONG ≥ 75 · MODERATE ≥ 50 · WEAK < 50

No black box: more distinct insiders, more dollars, and more senior buyers (CEO/CFO) push the score up.

Pricing

Pay-per-event - you pay only for each delivered cluster signal. No subscription, no charge when there are no clusters. Run it on a schedule (e.g. daily) and only pay for real, scored signals.

Data source & compliance

• Source: SEC EDGAR Form 4 filings - public-domain U.S. regulatory data, free and legal to use.
• No personal/contact data is collected - only public corporate filing facts (issuer, insider name & role as disclosed in the filing, transaction details).
• Respects SEC fair-access (descriptive User-Agent, rate-limited).

FAQ

Why are some runs empty? Open-market insider buy clusters are genuinely rare - that's exactly why they're a signal. Run daily on a schedule and let signals accumulate, or increase daysLookback.

Does it include sells? No - it covers cluster buying (code P). Sells, grants and option exercises are intentionally excluded.

Real-time? Form 4 filings appear on EDGAR within seconds of submission; this Actor reads the latest daily filings each run.

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Keywords: SEC Form 4, insider trading, insider buying, insider cluster, cluster buying signal, SEC EDGAR scraper, insider buy alerts, insider buying data, insider transactions API, insider screening data, quant research data.

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Note: Provided as data for research, screening and monitoring - not investment advice. Historical patterns do not guarantee future results.