Insider buying

Insider buying is the purchase of a company's shares by its officers, directors or more-than-10% shareholders using their own money. These legal trades must be reported on Form 4, generally within two business days, where an open-market purchase carries transaction code P.

How it works

Insiders can buy only when they are not in possession of material nonpublic information and, under most company policies, only during an open trading window, which usually opens a day or two after an earnings release and closes before the next quarter ends. Some purchases are made under Rule 10b5-1 plans, though plans are more common for selling.

Not every acquisition counts. Stock grants (code A), option exercises (code M) and dividend reinvestment are compensation or mechanics, not discretionary purchases.

Why it matters for traders

Academic studies have generally found that insider purchases carry more information than insider sales, since insiders sell for many reasons but buy for essentially one. Traders weigh:

• Cluster buys: several insiders buying within days of each other.
• Size: a purchase that is large relative to the insider's salary or existing stake.
• Role: CEO and CFO purchases are often weighted more heavily than those of a 10% holder or a director with a small stake.
• Context: buying after a sharp drop, or right after an earnings report, can signal management sees value the market is missing.

Common traps include token purchases sized for headlines, buys tied to a private placement at a discount, and purchases by a fund that is a 10% holder for its own portfolio reasons.

Example

After Harbor Freightline (ticker HRBF) falls 30% on weak guidance, its CEO buys 40,000 shares at $12.50 ($500,000), the CFO buys 10,000 shares at $12.40 ($124,000) and two directors buy a combined $300,000 within a week. That is a cluster buy of roughly $924,000 by four insiders.

FAQ

Is insider buying legal?

Yes, as long as the insider is not trading on material nonpublic information and reports the trade on Form 4.

Where can I see insider purchases?

They are public on EDGAR as Form 4 filings, and Quantisnow tracks them on its insider purchases feed.