Form D is a Securities and Exchange Commission form that is required to be filed within 15 days after a sale of securities relying on Regulation D. Because Regulation D is probably the most significant private placement exemption from the registration requirements of the Securities Act of 1933, a large number of private companies file Form Ds in connection with raising capital.
The form contains basic information about the company selling securities, its officers, directors, and promoters, as well as the securities offered and sold. The form also contains a voluntary item to disclose the company's revenue. A link to the form and its instructions is here.
In 2009 the SEC required companies to file Form Ds via its EDGAR system, rather than on paper. As a result, information from Form Ds filed subsequent to that date is readily available to the public at http://sec.gov/edgar/searchedgar/webusers.htm.