Insider Trading Calendar: March 2026 Director Buys

Every director buy is a statement of conviction — an insider using their own money to say the current price is too low. This guide shows how to read the monthly flow of director purchases across the LSE, AIM, NYSE and NASDAQ, and how to tell a meaningful buy from noise. For live filings, always go to the primary source (SEC EDGAR / RNS); the table below is an illustrative example of how different buys rank by conviction.

How We Score Insider Buys

Not all director buys are equal. A CEO spending £5,000 when they already hold £10 million of stock is noise. The signal is in size relative to existing holdings, clustering (multiple insiders buying within a short window), and timing relative to recent price weakness. DipBuster weights all three.

The Cluster Effect

Academic research (Lakonishok & Lee, 2001) shows that insider buys outperform the market by an average of 11.1% over the following 12 months. But cluster buys — where two or more insiders purchase within a 30-day window — produce even stronger excess returns, averaging 14.8% in the year after the signal. DipBuster detects these clusters automatically and elevates them to the leaderboard.

What to Watch Next Month

Two themes dominate April's expected filing calendar: UK industrials ahead of H1 results season, and US mid-cap tech after the recent correction. Keep an eye on any Form 4 filings where the purchase price is materially above the insider's previous buy — it signals they believe valuation has improved despite a higher stock price.