Company websites can be excellent sources of information on your company in certain areas. Location, products and services, mission statements and SEC filings can be located on the company website. However, this should not be the sole source of information on your company. Coming straight from the company, this is biased information and does not present a complete picture of the company. Information from reputable resources can help build a complete picture.
These resources are sources of basic information on companies such as company history, key competitors, and financial information.
SEC filings, in particular 10-K reports, can contain information on products, markets, R&D along with other important information on a company.