Corporate insiders, by law, must report their stock trades to the SEC within two business days. This creates a public data stream that anyone can use. The challenge is knowing where to look, what matters, and how to separate signal from noise.
This guide covers every source of insider trading data available to retail investors in 2026, from free SEC filings to paid institutional tools.
There are three categories of "insider" activity worth tracking, each with different data sources and different signal quality:
When a CEO, CFO, board member, or 10% shareholder buys or sells their own company's stock, they file a Form 4 with the SEC. These filings are public and available within 48 hours of the trade.
Why it matters: A CEO buying $2M of their own stock with personal money is one of the strongest bullish signals in the market. They have the most information about the company's future. Insider selling is less useful because executives sell for many reasons (taxes, diversification, buying a house).
Key filter: Focus on open-market purchases by C-suite executives. Ignore option exercises, planned 10b5-1 sales, and small transactions under $100K. The signal is in discretionary buys.
Free tools for Form 4 data:
Members of Congress must disclose their stock trades within 45 days under the STOCK Act. Some members consistently outperform the market, leading many investors to track their trades as signals.
The data is public but arrives with a delay (up to 45 days after the trade). By the time you see the filing, the trade might already be priced in. The value is in identifying patterns: which members trade ahead of legislation, which sectors they favor, and whether their historical trades have been profitable.
Top-performing congressional traders by historical returns:
| Member | Avg Return | Win Rate | Style |
|---|---|---|---|
| Mark Green (R-TN) | +76.5% | 100% | Large concentrated bets |
| Dan Crenshaw (R-TX) | +26.9% | 78% | Tech + defense |
| Tommy Tuberville (R-AL) | +18.3% | 65% | High volume, mixed |
| Nancy Pelosi (D-CA) | +12.8% | 62% | Big tech, options |
Free tools for congress trades:
Large institutions (hedge funds, pension funds, banks) trade in dark pools to avoid moving the market price. These trades are reported to FINRA after execution, creating a delayed but valuable dataset.
A dark pool block trade of $10M+ in a mid-cap stock is a strong signal that someone with deep pockets has conviction. Combined with options flow data (unusual volume, large sweeps), institutional activity can confirm or contradict what insiders are doing.
Tools for institutional data:
The biggest mistake retail investors make is checking insider data reactively. By the time a Form 4 filing goes viral on Reddit, the trade is already crowded. The edge comes from systematic monitoring.
Track Congress Trades for Free
Updated daily with the latest congressional stock disclosures and historical performance data.
See This Week's TradesYes. Trading based on publicly available SEC filings is completely legal. What's illegal is trading on material non-public information (MNPI) before it's filed. Once a Form 4 is filed with the SEC, anyone can act on it.
SEC Form 4 filings must be submitted within 2 business days of the trade. Most appear on EDGAR within hours of filing. Congress trades have up to 45 days, though many members file within 1-2 weeks.
Academic research consistently shows that insider purchases (not sales) predict positive returns over the following 6-12 months. The strongest signal comes from cluster buys, where multiple insiders at the same company buy within a short window.
For informational purposes only. Market Signals provides publicly available market data organized for convenience. This is not financial advice. Past market activity does not predict future results. Always do your own research.