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.
Changes in ownership are reported on Form 4 and must be reported to the SEC within two business days. You can find the limited categories of transactions not subject to the two-day reporting requirement in the new rule.