Corporate insiders – meaning a company's officers and directors, and any beneficial owners of more than ten percent of a class of the company's equity securities registered under Section 12 of the Securities Exchange Act of 1934 – must file with the SEC a statement of ownership regarding those securities.
The initial filing is on Form 3. An insider of an issuer that is registering equity securities for the first time under Section 12 of the Exchange Act must file this Form no later than the effective date of the registration statement. If the issuer is already registered under Section 12, the insider must file a Form 3 within ten days of becoming an officer, director, or beneficial owner.