Whoa. Most of those lists are paid lists for placement as "we're one of the top", aren't they? You look at fifteen of them and they'll all be different. Check this Link of actual # of domains hosted by hosting company. And I believe WildWest is one of those "we register everything as a holding place" companies. 1and1.com doesn't buy up and host holding domains.
yeah but at least they give you the names of the companies