Every month, hundreds of corporate insiders file SEC Form 4 disclosures after buying their own company's stock. Most of these are routine. But when a CEO spends six or seven figures of personal cash on open-market shares, it's worth paying attention.
We filtered March 2026 filings for C-suite open-market purchases only — no option exercises, no grants, no plan-based buys. Then we scored each one across 6 factors: fundamental health, financial strength, technical setup, CEO purchase history, conviction level, and cluster buying activity.
What makes an insider purchase meaningful?
Not all insider buying is equal. The academic literature consistently identifies three characteristics that separate signal from noise:
- Role matters — CEO and CFO purchases generate higher abnormal returns than purchases by directors or VPs. C-suite officers have the deepest knowledge of company operations.
- Open-market only — Transaction code "P" (open-market purchase) means the executive chose to buy at market price with personal funds. Option exercises and plan-based acquisitions are compensatory, not conviction-driven.
- Size relative to salary — A $50K purchase from a CEO earning $500K/year is far more meaningful than a $500K purchase from someone earning $15M. The conviction score measures this ratio.
How we score each filing
Each factor is scored 0–100, then weighted to produce a composite score. Signals scoring above 70 receive a BUY rating. Above 80 is STRONG BUY.
Why insider buying outperforms
The evidence is extensive. A landmark study by Lakonishok and Lee (2001) found that insider purchases in small-cap stocks generated statistically significant abnormal returns over 12-month periods. More recent research by Cziraki, De Goeij, and Renneboog (2014) confirmed that CEO purchases specifically — not just any insider — are the strongest predictor.
We backtested 210 C-suite purchases over 3 months. The result: 89% win rate, +7.2% average return vs S&P 500's -2.83% over matched holding periods. Every position is timestamped and visible on our track record page.
How to use insider buying data
Insider buying works best as a confirmation signal rather than a standalone strategy. When a CEO buys and the fundamentals, financials, and technicals all align, the probability of a positive outcome increases significantly.
- Filter for C-suite open-market purchases — ignore option exercises, grants, and purchases by lower-level insiders.
- Check the fundamentals — is the company profitable? Growing revenue? What's the debt situation?
- Read the technicals — is the stock near support levels? Is it oversold? Insiders often buy after selloffs.
- Set mechanical exits — define your target and stop-loss before entering. We use +10% / -15%.
The hard part isn't finding the filings — SEC EDGAR is free and public. The hard part is filtering, scoring, and tracking every signal systematically. That's what CEO Trader automates.
The bottom line
Stocks that CEOs are buying with their own money deserve a closer look. Not because insiders are always right, but because they have an information advantage that no analyst report can replicate. When someone who knows every line item of the P&L decides to invest their own cash, it tells you something that quarterly earnings calls don't.