By the InsiderAlpha research team · Updated Jul 16, 2026 · Sourced from SEC EDGAR filings
Usually, no — at least not on its own. Insider buying has one plausible motive (the insider expects the stock to rise), but insider selling has many innocent ones. Treating every Form 4 sale as a bearish signal is one of the most common mistakes retail investors make.
Academic studies consistently find that aggregate insider buying predicts returns far better than insider selling. Routine sales contain little information; only the opportunistic, pattern-breaking sales carry a weak negative signal. This asymmetry is why InsiderAlpha's scoring is built around high-conviction buys and treats most selling as noise to be filtered.
Use selling as context, not a trigger: filter out 10b5-1 and tax-withholding events first, then ask whether what remains is unusual for that insider. Most of the time, it isn't.
How to read insider buying signals → · Filtering 10b5-1 noise →