Ok, got you. I can answer these. Indeed, it is not representing all fast growing companies all around the world. However, it doesn't have to. Like I said in the post, there is no reason to believe that biases how many founders they have. Companies with two founders are not more likely to submit themselves to such a report. Anyway, almost all of them are businesses generating tons of revenue. A large percentage of them are public companies and many are 10-15 years old. Feel free to look them up.

A founder is someone listed as a co-founder either on the management page, Wikipedia, or in press mentions. It's not really slippery. It took so much time because I wanted to make sure I was doing it right.