Company information databases provide basic company information such as headquarters location and status (public/private/subsidiary) as well as significant activities, news and financials for public companies. Private company financials are estimates and not always available. Analyst reports from investment banks are available in Mergent Online under the Investext tab.
Forbes publishes lists of companies such as Best Employers, Most Trustworthy, Global 2000, Most Promising, Most Innovative, Asia's Best, etc.
Fortune annually publishes ranked lists of companies in various categories such as Most Admired, Fastest Growing, Best for Diversity, Best for ethnic groups, etc. Fortune 500 lists the largest, by revenue, American public companies and private companies that file financial documents with a government agency.
Inc 5000 is a list of the 5000 fastest growing private companies in America.