What are their home countries? Sorry I could do my own research, but since you made a comment that implied you had a piece of information at hand, I feel I may just get it easier this way.
Exyte (Germany) was a big one. I myself haven't been up to date with news in the industry for around 10 years since I abandoned all attempts to enter the industry.
Imagine, where they get their workers? They import them all from their home countries.