For public companies, this will be the largest shareholder. Search the company's stock ticker symbol at
Morningstar.
Also check:
Forbes,
BusinessWeek,
Yahoo! Finance,
Biznar.
Tip: For smaller and privately held companies, you may need to search government incorporation records to find the names of owners or officers. With US companies, such records are usually held by the relevant Secretary of State's office.
Begin by checking
this directory of links to Secretary of State websites. Their corporation registries are listed in the far right-hand column
(example).
The layout and quality of these websites varies. (Some charge an access fee.) Most, however, will feature some sort of "corporation" or "business entity" search form
(example).
Within the actual filings, the owner may be listed as "member," "director" or "incorporator." If the records don't reveal company ownership, they will at least identify some of the people in company leadership roles. This is what you're looking for
(example).
(Note: The company's "registered agent" is not necessarily an employee. Sometimes, the agent is little more than a glorified post office box, or an attorney hired to answer the company's mail. But if all you can find is an agent, paste the name, address and title here.)