Form 4

A Form 4 is the filing company insiders, executives, directors, and anyone holding more than 10% of the company's shares, are required to submit to the SEC to disclose their own trades in the company's stock. It must generally be filed within two business days of the transaction, making it one of the fastest windows of public disclosure available on any company.

Each Form 4 records what was bought or sold, at what price, and whether the transaction was a genuine open-market purchase or sale, or something more routine like an option exercise or shares withheld to cover taxes on newly vested stock. It is filed through EDGAR and is publicly searchable by company or individual, and is the primary source behind any headline or tool reporting on insider buying or selling.