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Insider transactions are a real signal, but not in every case — why selling isn't always bad, and buying isn't always good.
A senior executive or director who buys stock with their own money, while having access to internal information about the company's condition, sends a signal that's hard to fake: they're putting their money where their information is. That's why insider purchases (especially significant ones, from multiple different insiders in the same period) are considered a relatively reliable positive signal.
Executives sell shares for reasons that have nothing to do with the business outlook — exercising options that are about to expire, personal risk diversification (most of their personal wealth is 'locked' in company stock), paying taxes, buying a house. A single sale, especially one scheduled in advance (a 10b5-1 plan), carries far less meaning than an unscheduled purchase.
Multiple different insiders buying/selling in the same short window, the size of the transaction relative to their existing holding, and timing relative to upcoming events (earnings, announcements) — all of these improve signal quality. A single, relatively small transaction from one executive — less so.
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This research is intended for general educational purposes only, does not constitute investment advice, and is not a prediction. Full details on the disclaimer page.