I'm not economist but I suspect that such concentration of tech companies in US is due to the fact that it was their home market from where they started. I thin

I'm not economist but I suspect that such concentration of tech companies in US is due to the fact that it was their home market from where they started. I think that the question was more along the lines: Is there any example of a company that started in EU and moved they main operations to US? Most companies that are on those lists have also strong EU presence.