Guide · 5 min read
What insider buying actually signals in mining stocks
Cluster buys, executive ranks, open-market vs option exercises — how to separate a strong conviction signal from noise.
Not all insider buys are equal
An insider purchase shows up on SEDI (Canada) or EDGAR Form 4 (US) within 2–5 business days of the trade. It's tempting to treat every insider buy as bullish, but the signal varies a lot depending on the context.
What you want to see: open-market purchases by senior executives — CEO, CFO, COO — at material dollar amounts (typically >25% of their annual cash compensation), in a short window where multiple insiders buy at once. That's a cluster buy, and it's the strongest conviction signal in the data.
What's not really a signal
Option exercises followed by an immediate sale are not bullish — that's just monetizing comp. Some insider filings report 'acquired' shares that are actually grants vesting, not purchases. Read the transaction code: '10' / 'P' = open-market purchase; '11' / 'F' = grant; '53' / 'M' = option exercise.
Small purchases by directors that match a board-policy minimum-holding requirement also carry little signal. Directors often buy quarterly to maintain a target holding regardless of their personal view.
Executive rank and dollar amount
A CEO buying 200,000 shares on the open market for $400,000 is a meaningful conviction signal because that's typically a significant fraction of their post-tax annual cash. The same dollar amount from a non-executive director is a smaller signal — directors usually have more outside wealth and smaller exposure.
Rank also affects information access. Operating executives see project-level numbers daily. Independent directors see them at scheduled board meetings. The buying pattern of operating executives carries more information about near-term project performance.
What insider selling means
Insider selling is harder to interpret. Some insiders sell for personal reasons that have nothing to do with the company — tax, divorce, diversification. A planned 10b5-1 trading plan (US) or automated SEDI program (Canada) further muddies the signal.
What's worth watching: clustered insider selling across multiple senior executives in a short window — especially if it follows a price spike or precedes an information release window. That's the same pattern as a cluster buy, inverted — and it's the second-strongest signal in the data after open-market cluster buys.