Articles can be a good, unbiased source for news and background about companies, especially small or private companies.
There are several databases that can be used. The results will vary because each database gathers the information differently and allows different ways to filter the results. It may be best to do the search in a couple and see which one gives the best results.
This Google table gives an indication of what is included in the most-used directory databases.
Provides in-depth histories of companies that are significant in an industry or geographic location. Useful for students, job seekers, historians and investors.