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The online version of two print directories: The Directory of American Firms Operating in Foreign Countries The Directory of Foreign Firms Operating in the United States.
The tools below allow users to generate their own lists of companies based on criteria such as industry, location, and size.
For those who are looking for key competitors in a major industry, regardless of location, then most databases which provide company information also include a list of key competitors within the profile. To this end, in addition to the resources below, users should also do a 'companies search' in the Standard and Poor's S&PNetAdvantage.
In the Advanced Search, use the tabs to generate a list of companies based on location, financials, ratios, stock pricing, or industry (SIC or NAICS).
UniWorld (Who Operates Where)
To keep result lists from becoming too unwieldy, try running two separate searches: one for public companies, and one for private companies.
Keep in mind, information about individual public companies will likely be available in databases such as Mergent, Mergent Intellect (Hoovers), and Lexis. Information about private companies can be difficult to find.