Hoover's Online

Largest public and private US companies, with name, key personnel, address, sales, employees and ticker symbol, plus articles and links to company pages and business sites, including List of Lists rankings

Monster Research Companies

Company and industry profiles include news, public relations, overviews, competitors, executives, homepages, quarterly and annual financials, stock quotes and price graphs

VaultReports.com

Links to industry articles, career profiles, company pages and career advice about diversity, entrepreneurship, internships and interviewing