D&B Hoovers enables users to create custom lists and reports for researching US and international companies. Use the Search and Build a List link to identify target companies using filter categories such as company size, company type, financials and more. The resulting reports contain company information such as SEC filings, market research reports, analyst reports, SWOT analyses, and industry information from First Research. Use the Desktop link to assemble and "pin" lists and reports for easy access. NOTE: Pinned items are only saved to the desktop for the length of your session; sessions are subject to timeouts. Simultaneous access is limited to 50 users.
D&B Hoovers is a good resource for finding information on privately held companies. Use the Company Search box at the top of the page to find company reports.
Use ReferenceUSA (Data Axle) is a great resource for information on privately held companies.