I am likely to believe in parts of this. Even without sources, it tells a story that I can believe.

However, there is a big question that I would ask, about whether things are quite as lopsided as this would indicate.

What are the sizes of the companies in these various countries? And do each of them have the same criteria for what makes a company? If Great Britain has laws that make it easier for smaller companies to incorporate, there could be dozens of small companies to every big one in the US, drawing the average down. I could question the data many other ways like this. So while this might be true, I don't know exactly how the data would be determined.