Form 4

The near-real-time disclosure of insider stock buys and sells by executives, directors, and big holders.

Also known as: Insider Transaction, Section 16 Filing

What it is

A Form 4 reports transactions in a company's stock by insiders, officers, directors, and 10% owners, generally within two business days. It shows shares bought or sold, price, and remaining holdings. It is a Section 16 requirement.

What it does

Insider buying, especially open-market purchases by executives, is watched as a conviction signal, while clustered selling can flag concern. Investors screen Form 4s for meaningful, non-routine trades. Context (10b5-1 plans, option exercises) matters.

The evidence

Notable open-market insider purchases have preceded stock rallies and are tracked as sentiment signals.

Best for

Any single name; especially small and mid-caps where insiders own large stakes.

Pairs well with

8-k, 13f, catalyst

Use cautiously with

Sales are often for taxes or diversification under preset plans; reading all selling as bearish misfires.

Cautions

One insider trade is a weak signal on its own and needs corroboration.