Is there a free open database of all companies/businesses in the world? If not, how would you go about building one, what would you need to do?

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    Does this answer your question? Seeking global list of registered businesses Nov 5 '20 at 22:31
  • Not really, as far as I can tell the data there is not free. Nov 5 '20 at 22:33
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    Your approach would likely start at supporting the major countries. Australia, US (state-wise...), etc, and for all the work required it'd likely require remuneration to sell-on or make worth it. I once did a project for a specific state to capture business registrations, and I ended up having to learn how to parse old COBOL data formats, so the project would be scattered as far as resources would go. Write a generalized data capture library. Just some ideas.
    – Jack Hales
    Nov 12 '20 at 9:15

You can scrape the following Wikipedia-pages and use the opencorporate-API to build your own/ custom database. Otherwise, here are some limited but yet useful resources/ datasets:

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