Business Insights: Essentials: This database offers a great company search feature. Search any large publicly-traded US company and you'll get a ton of information. You'll find recent news on the company. Then there's company history and a list of rankings too.
Nexis Uni: This is a great business resource. Do a "Get Company Info" search for most any large public company. You'll be able to see if the company is involved in lawsuits, view stock prices, find company news, and so on.
Reference USA: Researching a smaller company in the United States? No problem. Reference USA has over 14 million US businesses in their database. Locating accurate data on smaller (or even large) privately held companies is sometimes tricky. For these types of companies, Reference USA is one of your better resources.