Insider Trading Calendar: March 2026 Director Buys
A monthly round-up of the most significant director purchases filed with the FCA and SEC — the buys worth following.
Every director buy is a statement of conviction — an insider using their own money to say the current price is too low. March 2026's filing calendar produced 23 notable director purchases across the LSE, AIM, NYSE and NASDAQ. We filtered for the ones worth following.
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.
| Exchange | Role | Value | % Existing | Signal |
|---|---|---|---|---|
| AIM | CEO | £487K | +18% | STRONG |
| NYSE | CFO + COO | $2.1M | +31% | CLUSTER |
| LSE | Chairman | £220K | +7% | MODERATE |
| NASDAQ | Director ×3 | $780K | +24% | CLUSTER |
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.
Disclaimer: Not financial advice. DipBuster is an information platform. Always do your own research before investing.