Form 3 is an SEC filing

SEC filing

An SEC filing is a financial statement or other formal document submitted to the U.S. Securities and Exchange Commission . Public companies, certain insiders, and broker-dealers are required to make regular SEC filings. Investors and financial professionals rely on these filings for information...

 filed with the US Securities and Exchange Commission to indicate a preliminary insider transaction by an officer, director, or beneficial (10%) owner of the company's securities. These are typically seen after a company IPOs when insiders make their first transactions. After a Form 3 is filed, future filings of the same nature are filed under Form 4

Form 4

Form 4 is a United States SEC filing that relates to insider trading. Every director, officer or owner of more than ten percent of a class of equity securities registered under Section 12 of the Securities Exchange Act of 1934 must file with the United States Securities and Exchange Commission a...

 (standard disclosure) or Form 5

Form 5

Form 5 is an SEC filing submitted to the Securities and Exchange Commission on an annual basis by company officers, directors, or beneficial owners, which summarizes their insider trading activities. This form is simply a combination of year's Form 4 filings, which are mandatory filings made...

(annual disclosure).