Which company has dozens of class A networks? The only one I'm aware of with two is HP who had 15/8 and 16/8, but I think they returned at least a significant amount of that.

BBN/successors may have held multiple class As at times, but being large ISPs probably used a lot of the space? Various clouds have a lot of space, but afaik, not in the form of whole class As.

Looks like IBM probably had multiple class As through acquisition, but I don't think they still hold them either?