Every insider trading tracker drinks from the same well: SEC Form 4 filings on EDGAR. What differs is the plumbing. Seven tools, ranked by what each one is actually good at.
- OpenInsider: the free workhorse: full Form 4 screener with transaction codes and ownership changes.
- InsiderScreener: 16 markets with unusual-activity detection and daily email reports.
- Fintel: institutional ownership plus insider data in one view.
- Quiver Quantitative: alt-data dashboards pairing insider flow with congressional trades.
- Unusual Whales: options flow first, insider data second, built for speed.
- WallStreetZen: Bullish Insider Buys inside broader quant ratings, best for part-timers.
- InsiderPulse (stockspro24.com): 5 free cluster-buy alerts a month plus the Form 4 feed; $9/mo unlimited with push and SMS; $12/mo Pro adds congressional trades.
Sources: [OpenInsider](http://openinsider.com/), [InsiderScreener alerts](https://www.insiderscreener.com/en/l/insider-trading-alerts)
Pick the one whose filters match your strategy. The data is the same everywhere; the interface is the product.