For prominent companies whose stock is publicly traded, you can't beat a Business Source Complete database company profile. You'll find an extensive company history, plants/locations, summary of products/services, a SWOT analysis and much more.
Step One: Click on the More tab in the blue top toolbar. Select Company Profiles from the drop-down options.
Step Two: Enter company name. TIP: If a report doesn't pop up, try using the "Match Any Words" button.
The database Nexis Uni is the best place to start if unsure of your company's, your prospect company's, or a close competitor's ownership status. Start your search in the Get Company Information box at the bottom of the home screen. Note headquarters address and ownership status. Pick from the short list or click on the View All Companies button to find a better match.