This list is incorrect. The author asks "just where have most of the great software companies been started?", and proceeds to list headquarters. Three corrections, for US companies (yes, I checked the entire list):

  2. Microsoft: Albuquerque, New Mexico
  6. First Data: Omaha, Nebraska
  11. Computer Sciences Corporation: El Segundo, California

So make that 7, for what it's worth. The list really isn't worth looking at, though. The other problems mentioned here are trivial, compared to the problem of a sample size of 20 being too damn small to have any meaning.

I hate lists like this, and the stupid conclusions drawn from them. Exercise for the reader my ass.