Use a directory to verify company name and address, and find information such as company size, products and services, SIC if available. See the business directories page for a list of directories. Search newspaper and journal indexes, especially those covering a company's hometown publications. Search trade journals and industry newsletters relevant to the company's line of business. Look at the company homepage.
Most companies have their own home pages.
If you are trying to locate information about a company, use their name in the URL address. Disclosure documents of these public firms sometimes mention private companies with which they do business. An easy way to identify whether your company is mentioned in a long financial report is to use the Edit command on your browser. In the pull-down menu, select 'Find in Page' and type in the company name in the blank. Click on 'Find Next' to highlight your company in the report.