Two business databases, ABI Inform Complete and Business Source Premier, are the best sources for locating articles a wide variety of articles on companies. LexisNexis is an excellent for locating articles in news sources both US and international.
Wall Street Journal (through Proquest/ABI)
Other useful resources include
Academic Search Complete (for interdisciplinary approaches)
Proquest Central (for interdisciplinary and news sources)
Google Scholar (interdisciplinary and scholarly)
Link to All Library Databases
Here is an example of a search for a company in ABI