Oh, it's easy to figure out. The US top 10...
You take your iPhone to McDonalds where you order a Coke, you pull out an old IBM laptop running Microsoft Windows, tether it to your iPhone and bring up Google to search the net, on AT&T's network, after drinking the coke and scoffing a McD you have a strong desire for some antacids so grab some made by Proctor and Gamble.
I'd take the results with a huge pile of salt, Putting Shell as a British company (Royal Dutch Shell is a bit of a give away there) should have put up a flag. HSBC? Hongkong and Shanghai Banking Corporation. They can't even spell Vodafone :) Although Voda (#16) is a 45% holder in Verizon (#17) so why wasn't that taken into account? If it was then Voda would be 2nd place which is why the survey is basically a lotta rubbish.