Insider transaction filings get widely reported whenever an executive buys or sells a meaningful block of shares, but the predictive value of these filings varies enormously depending on details that a simple headline transaction size rarely captures.

Routine sales, those occurring under a pre-established 10b5-1 trading plan set up months in advance for diversification or tax planning purposes, carry essentially no informational signal about an executive’s current view of the company, and treating every insider sale as a bearish indicator misreads a large share of the filings that actually occur.

Open market purchases, by contrast, are almost never automatic or pre-scheduled, since executives face no obligation to buy shares and generally do so only when they see genuine value at current prices, which makes a cluster of insider buying, particularly from multiple executives within a short window, a considerably more reliable signal than any single sale.

The size of a transaction relative to an insider’s overall existing holdings and total compensation matters more than the absolute dollar figure. A modest purchase representing a meaningful share of an executive’s liquid net worth signals more conviction than a much larger purchase that represents a small fraction of that same executive’s overall wealth.

Timing relative to upcoming known catalysts deserves scrutiny as well, since insider purchases made shortly before an earnings release or major regulatory decision carry different legal and informational weight than purchases made during a routine trading window with no imminent company-specific event on the calendar.

Research Notes that track insider transaction patterns alongside trading plan status and position sizing relative to overall insider wealth, rather than treating raw transaction totals as a standalone signal, such as the analysis published by BullScope, give investors a more reliable read on which insider transactions actually carry information worth weighing.