InsiderAct vs SecForm4: Which Insider Trading Tracker Is Better? (2026)
SecForm4 is a free-to-browse site of insider, 13D/13G, and institutional filing lists. InsiderAct turns Form 4 filings into scored insider buying signals with alerts. Both read public SEC data. Here is where each fits.
Quick Answer
SecForm4 is best for browsing raw insider transactions alongside 13D/13G and institutional holdings. InsiderAct is best for finding which insider buys matter: it detects cluster buys, scores them, flags large purchases and dip buys, and offers email alerts on Pro. Many researchers use a free list site for lookup and InsiderAct for the shortlist.
Feature Comparison
| Feature | InsiderAct | SecForm4 |
|---|---|---|
| Focus | Scored SEC Form 4 insider signals | Form 4 lists plus 13D/13G and institutional holdings |
| Price | Free plan / Pro $9.99/mo or $99.99/yr | Free access to core pages; paid tiers not specified on homepage |
| Cluster buy detection | Automatic, with confidence score | Not described on their site |
| Alerts | Real-time email alerts (Pro) | Not mentioned on their site |
| Data timing | Indexed within hours of SEC submission | States filings update in real time as filed |
| Mobile | Responsive web | No app mentioned on their site |
| 13D / 13G filings | No | Yes |
SecForm4 details from secform4.com as of October 2026. Features not listed on its homepage may exist; verify on their site.
SecForm4: Best for Free Filing Lookup Across Filing Types
SecForm4 organizes filings into insider buys, insider sales, stock options, 13D and 13G lists, buy/sell ratios, a graph view, and an Insider Watch page, plus institutional investor reports and stock screeners. It resembles OpenInsider in spirit but covers more filing types.
- ✓Free access to insider buy and sell lists, with real-time filing updates per the site
- ✓Adds 13D/13G filings and institutional holdings in the same site
- ✓Insider Buy/Sell ratios, graph view, and a stock screener
- ✗Alerts, email, and RSS are not mentioned on the site
- ✗No documented cluster-buy scoring or explanation of why a trade matters
- ✗Which tools are free versus paid is not clearly stated
Best for: Researchers who want a free place to browse insider and 13D/13G filings and do their own filtering.
InsiderAct: Best for Prioritized Insider Signals
InsiderAct focuses on the filings most likely to carry information: cluster buys across multiple insiders, large open-market purchases, and buying after declines. The Signals page ranks them and shows why each qualified.
- ✓Automatic cluster buy detection with confidence scoring on the free plan
- ✓Large purchase and buying-the-dip signals, each with the reason it qualified
- ✓Real-time email alerts on Pro
- ✓Stock chart with insider buy and sell markers
- ✗No 13D/13G or institutional holdings coverage
- ✗US-listed companies only; free plan history is 7 days
Best for: Investors who want a short daily list of high-conviction insider buying and optional alerts.
Which should you use?
- 1You need 13D/13G or institutional filings: Use SecForm4 for those, and add InsiderAct for scored insider buying.
- 2You want to know which insider buys matter: Use InsiderAct. Start on the free plan and check the Signals page.
- 3You want to compare more options: See our guide to the 10 best OpenInsider alternatives, or the InsiderAct vs OpenInsider comparison.
See today's insider signals
The free plan includes cluster buy confidence scoring and 7 days of transaction history. No credit card required.
View today's insider signals →