Global news aggregator database. Good in general for business news, but also has company dossier pages (all news connected to a company) and a good way to try to find info on a company if you're not finding it elsewhere (perhaps there are some news stories related to the company).
In-depth reports on industries, economies and consumers. You can view detailed information on markets at a national level, and of particular use is unique analysis content with outlook information, etc.
You will need a Columbus Metropolitan Library card to use this database, but you should probably have one anyway! Business directory search can be limited by county + industry and easily downloadable up to 500 records.
This database is focused on... eMarketing, but of note to you might be the fact that it breaks out B2B Marketing, Mobile, Sales and Social Media as focus industry areas. Potentially some useful analysis in there.
Private companies don't have to file almost anything other than filing Articles of Incorporation with the SOS (if they're a corporation). All this guarantees me is a name (who filed) and address, sometimes phone number, often dated.
Great source for in-depth company information; includes a 'Report Builder' tool for individual or comparison with competitor reports. Unique offering in 'Supply Chain' tab; see companies that are part of the supply chain in various lines.