When a company's CEO buys $2 million of their own stock with personal money, that is one of the strongest signals in all of finance. They know the business better than any analyst on Wall Street. If they are putting their own cash on the line, they believe the stock is undervalued.
The good news: every one of these transactions is publicly disclosed within two business days. The SEC requires it. The data is free. Most investors just do not know where to look or what to look for.
This guide explains exactly how to track insider filings, which ones matter, which ones to ignore, and how to get automatic alerts without checking EDGAR manually every day.
What Is SEC Insider Trading (the Legal Kind)?
The term "insider trading" has two meanings. The illegal kind involves trading on material non-public information — tips from employees, leaked earnings, etc. That is illegal and what gets people arrested.
The legal kind — what this guide covers — is when corporate insiders (executives, directors, 10%+ shareholders) buy or sell their own company's stock and disclose it to the SEC within two business days. This is not only legal, it is mandatory. The SEC publishes every transaction at edgar.sec.gov for anyone to see.
Key distinction: Illegal insider trading = trading on secrets. Legal insider disclosures = executives publicly reporting their own trades. This guide covers the legal, public disclosures only.
The Three Forms You Need to Know
When an insider buys or sells stock, they file one of three forms with the SEC:
| Form | What It Means | How Often | Signal Value |
|---|---|---|---|
| Form 3 | Initial ownership statement — filed when someone becomes an insider for the first time | Once (on appointment) | Low — no transaction yet |
| Form 4 | Change in beneficial ownership — filed every time an insider buys or sells | Within 2 business days of each trade | Very high — this is the one to watch |
| Form 5 | Annual catch-up for small transactions exempt from Form 4 | Once per year | Low — historical only |
Form 4 is the one that matters. It captures every open-market purchase and sale by every executive, board member, and major shareholder — filed within two business days.
How to Find Insider Filings on EDGAR (Manual Method)
Go to EDGAR Full-Text Search
Navigate to efts.sec.gov/LATEST/search-index?q=%22form+4%22&dateRange=custom&startdt=2026-01-01&enddt=2026-12-31&forms=4 — or simply go to efts.sec.gov and filter by form type "4".
Search a Specific Company
On the EDGAR company search page, type the company name or ticker. Select "4" from the form type dropdown. You will see every insider transaction for that company, most recent first.
Read the Filing
Open a Form 4. Table I shows non-derivative securities (common stock). Look at column 4 (transaction type) — "P" means open-market purchase, "S" means sale. Column 5 shows the number of shares. Column 6 shows the price per share.
Check Who Filed
The top of the form lists the reporting person's name and relationship to the company. CEO purchases carry the most weight. Director purchases are meaningful. Automatic stock plan purchases (coded "A") are less significant.
Calculate Dollar Size
Multiply shares (column 5) by price (column 6). A $500K purchase by a CEO earning $3M per year is meaningful. A $10K purchase is a footnote. Dollar size relative to the insider's compensation is the key metric.
Not All Insider Trades Are Signals
The biggest mistake retail investors make is treating every insider transaction as a buy signal. Most insider transactions are noise. Here is how to separate signal from noise:
Open-Market Purchase
The insider went to a broker and bought stock with personal cash. No obligation. Pure conviction.
CEO / CFO Buying
C-suite executives have the most complete view of the business. Their buys carry maximum weight.
Cluster Buying
Multiple insiders buying in the same week independently. Rare and historically very predictive.
Large Dollar Size
$1M+ purchase by an executive who earns $2M/year means they believe the upside is substantial.
Stock Comp Grants
Automatic awards granted by the board. The executive did not choose to buy. Low signal value.
10b5-1 Plan Sales
Pre-scheduled sales set up months in advance. Not a real-time signal — the decision was made earlier.
Director Selling
People sell for many reasons: diversification, taxes, mortgages. Selling is almost never a reliable signal.
Small Purchases (<$50K)
Token purchases by executives who earn millions. More symbolic than conviction-driven.
The Research Behind Why This Works
Academic research spanning decades consistently finds that insider purchases outperform the market. A landmark study published in the Journal of Finance found that open-market insider purchases generated excess returns of 6–11% in the 12 months following the filing date.
The intuition is simple: executives have access to information about their own company's pipeline, contracts, and competitive position that no outsider can fully replicate. When they put significant personal capital at risk in their own stock, the market should pay attention.
The timing problem: By the time a Form 4 is filed and published on EDGAR, the stock has often already moved. Many professional traders have automated systems that detect EDGAR filings within seconds of submission and trade immediately. Manual EDGAR checking puts retail investors significantly behind.
How to Get Automatic Insider Alerts
Manual EDGAR checking every day is not realistic for most people. These are the main options for automated alerts:
Option 1 — EDGAR RSS Feed (Free, Technical)
EDGAR publishes an RSS feed of all new filings at https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=4&dateb=&owner=include&count=40&output=atom. You can pipe this into an RSS reader or write a script that parses new Form 4s. Works but requires technical setup and the feed includes all filers globally — mostly noise.
Option 2 — OpenInsider.com (Free Web Tool)
OpenInsider.com aggregates Form 4 data into a searchable table with filters for transaction type, dollar size, and insider role. Good for manual research. Does not send real-time alerts automatically. Best used for looking up a specific company before you trade.
Option 3 — SEC EDGAR Alerts (Free, Per-Company)
On any company's EDGAR filing page, there is a "Get Email Alerts" option. You can subscribe to alerts for specific companies. The limitation: you need to know which companies to watch. It does not surface new meaningful insiders across the entire market.
Option 4 — SniperMachine (Free, Automatic, Signal-Ready)
SniperMachine monitors EDGAR continuously across the entire US stock universe. When a meaningful insider purchase is detected — filtered by transaction type (open-market only), role (C-suite weighted higher), and dollar size — it is scored against 7 other data sources (options flow, Reddit velocity, news sentiment, technical levels, etc.). If the combined AI score exceeds 65/100, a trading signal fires automatically.
The result is a pre-filtered, high-conviction alert — not a raw EDGAR dump. Signals include entry price, take-profit target, and stop-loss. Every signal and its outcome is published at snipermachine.com/track-record.
Get Insider Alerts Automatically — Free
SniperMachine monitors SEC EDGAR 24/7 and fires signals when insider buys converge with options flow, Reddit velocity, and 5 other sources. No manual checking required.
See Live Insider SignalsReading a Real Form 4 — Example
Here is how to interpret a real filing. Suppose you see a Form 4 from a CEO at a mid-cap biotech:
- Reporting Person: John Smith, Chief Executive Officer
- Transaction Type (Column 4): P (open-market purchase)
- Shares (Column 5): 250,000
- Price (Column 6): $4.20
- Total Dollar Value: $1,050,000
- Post-Transaction Ownership: 2,400,000 shares
This reads as: the CEO spent $1.05 million of personal cash buying shares in the open market at $4.20. That is the signal. Now check: does the CEO earn enough that $1M is meaningful? Is this a first purchase or part of a pattern? Have any other insiders filed Form 4s in the past 30 days? Are there any other catalysts visible in the data?
This is exactly the multi-source convergence that SniperMachine automates — cross-checking the EDGAR filing against options flow, price action, and social sentiment to determine whether a signal is worth acting on.
Common Mistakes When Following Insider Filings
- Acting on any purchase, regardless of size. A $5,000 director purchase from someone who earns $500K is noise. Filter by dollar size first.
- Ignoring transaction type. Always verify the code in column 4. "P" = open-market purchase. "A" = automatic grant. Only "P" transactions are conviction signals.
- Following insider selling. Executives sell for too many reasons. Selling data is unreliable as a timing signal.
- Ignoring the company's situation. An insider buying during a sector-wide crash is different from buying after the stock already ran 40%.
- Acting on stale data. Form 4 must be filed within 2 business days, but the transaction may have happened before that. A filing showing a purchase from 3 days ago during a fast-moving market may be significantly behind.
Frequently Asked Questions
Summary
SEC insider trading disclosures — specifically Form 4 open-market purchases — are among the most reliable leading indicators in public markets. Executives buying their own stock with personal cash is a clear vote of confidence that deserves attention.
The challenge is filtering the signal from the noise (grants, auto-plan sales, small token buys) and acting on it fast enough to matter. Manual EDGAR checking misses the timing. Automated monitoring with pre-filtering by transaction type, role, and dollar size is the practical solution.
SniperMachine does exactly this — monitoring EDGAR continuously, filtering for meaningful C-suite open-market purchases, and confirming against 7 other data sources before firing a signal. Every signal is published with its outcome at snipermachine.com/track-record.
See SniperMachine's Insider-Triggered Signals
100% free. No credit card. Every signal includes the data source that triggered it — including which executive bought and how much.
Open the App FreeDisclaimer: Nothing on this page constitutes financial advice. SEC insider filings are public information. All trading decisions are the responsibility of the individual trader. Past signal performance does not guarantee future results.