Does Insider Buying Predict Stock Returns?

The short answer. Insider buying means a company's own officers and directors purchasing shares on the open market with their own money, disclosed on SEC Form 4 within two business days. It is watched because it is the one transaction where the people with the most information are voluntarily taking risk. The strongest version of the signal is a cluster: three or more separate insiders buying the same company inside 90 days.

Does insider buying predict stock returns?

The academic answer is a qualified yes, and the qualification does most of the work. Studies going back to Lorie and Niederhoffer in the 1960s, and more carefully Lakonishok and Lee (2001) and Jeng, Metrick and Zeckhauser (2003), find a modest but persistent abnormal return following insider purchases — concentrated in smaller companies, stronger for clusters than single trades, and small enough that transaction costs matter.

Insider selling has almost no predictive content. Executives sell for university fees, divorces, diversification and because their compensation is paid in stock. Buying has one obvious motive; selling has fifty.

Which companies have insider cluster buying right now?

What counts as a cluster, and why filter so hard?

Three or more distinct insiders, open-market purchases only (transaction code P), within a rolling 90 days. The code filter is the important part and it is where most trackers go wrong: a batch of annual director grants looks identical to ten insiders "buying" on the same day if you only read the acquired/disposed flag. Grants (code A), option exercises (M) and shares withheld for tax (F) are compensation events, not decisions, and none of them count here.

What this cannot tell you

• Why they bought. Form 4 has no field for reasons.
• Whether they are right. Insiders are optimistic about their own companies by disposition and by selection.
• Anything about the size relative to their wealth. A $50,000 purchase means something different from a chief executive than from a non-executive director.

Educational information, not financial advice. Every figure on this page is read from the source filings when the page loads rather than written into the article, so what you are reading is today's data and not a snapshot of the day it was published.