Reading the Rhythm of Insider Trades
Insiders time not just what they trade but how long they take, and the pattern reveals who is trading on information.
Studies of insider trading usually treat each trade as an isolated event. This research starts from a different premise: an insider with a long-lived informational advantage should spread trading over an extended period, while one whose edge is about to expire should strike quickly.
Taking the duration of trading strategies seriously produces robust new evidence that both insider purchases and insider sales predict abnormal returns. That is a notable result, since sales are usually dismissed as routine moves for liquidity or diversification.
The study also uncovers a disclosure tactic. Some insiders report their trades after the market has closed. These after-hours reporters are more likely to run longer sequences of trades, they trade more shares overall, and their trades earn larger abnormal returns, a pattern consistent with insiders managing disclosure to preserve their edge.
For regulators and researchers screening for informed trading, the practical payoff is a sharper filter: watch the rhythm of the trades and the timing of the paperwork, not just the trades themselves.
The Takeaway
The shape of an insider's trading, how long it runs and how it is disclosed, reveals information that single-trade analysis misses. Even sales predict returns once patterns are considered.