Hi!
Much less people notice that among the most popular Wikipedia is the only one that doesn't sell them anything
We don't sell, we just hold reference material at ransom. Don't be too ecstatic, it comes with a cost.
As for Alexa, it has the list polluted by multiple mega-company properties (e.g. count multiples of Google) - so it doesn't really have a list of companies. And I'm sure that list has entities with less revenue.
Domas