Thanks for the list of Phoenix-based companies.
Here’s an even wider list of Arizona-based companies:
http://en.wikipedia.org/wiki/List_of_Arizona_companies
The big hitters are...
Allied Waste
Best Western
Coldstone
Dial (soap)
Discount Tire
Fender
GoDaddy.com
PF Changs
PetSmart
U-Haul
US Airways
Thanks and BTTT! :)