Insiders Trades Sigma vs GuruFocus
GuruFocus is a US value-investing classic since 2004: tracking great managers (Buffett, Klarman, Pabrai), Double/Triple Buy screeners combining guru and insider buys, deep fundamental ratios. It's a dense analytical platform, and a bit expensive. Sigma plays a different game: an insider-data platform, multi-market, API-first, scored and backtested, at a third of GuruFocus Premium's price.
| Criterion | GuruFocus | Sigma |
|---|---|---|
| Coverage | US + partial international | 28 live regulators unified in one API |
| Insider data | Form 4 since 2004, Double/Triple Buy screeners, politicians | Multi-market insiders since 2006, public 0-100 score |
| Price (May 2026) | Premium $424/yr (US, 30y data) · Premium Plus ~$1,398/yr · Professional on quote | Free · €19/mo Pro (~€228/yr) · €99/mo Quant (beta, waitlist) |
| Public API | Excel/API 2,000 req/mo (Premium) · 20,000 (Premium Plus) | REST included from Pro · 10,000 req/mo (Pro) · 100,000 (Quant) |
| MCP server | No | Yes (Claude, ChatGPT, Cursor) |
| Methodological backtest | Not published | Walk-forward + Bailey-LdP DSR + public portfolio Sharpe |
| History | Form 4 since 2004 (22y) | Since 2006 (20y on the oldest markets) |
Where GuruFocus wins
GuruFocus has 22 years of Form 4 history, 30 years of financial data and a fine-grained mapping between guru buys, buybacks and insiders. For a value investor wanting a complete fundamental screener and willing to pay $424/yr, it makes sense. Their Double/Triple Buy crossovers are a genuinely proprietary idea we do not duplicate.
Where Sigma wins
Sigma costs roughly €228/yr on Pro, half of GuruFocus Premium. You get 28 live regulators (vs US plus partial international), a REST API without a paid add-on, an MCP server callable by Claude/ChatGPT/Cursor, and a published walk-forward backtest with Bailey-Lopez de Prado adjustment. GuruFocus has none of those four. If you want to query "all CEO buys above €500k on the DAX over the past six months" from a Python script or an AI agent, Sigma makes that a three-line call.
Verdict
GuruFocus if you're a US value investor wanting 22 years of Form 4 archives. Sigma if you want 28 live regulators, an API, an MCP and a methodological backtest for half the price.