I mean, I didn't work with Apple or Google, so I can guess you'd see them there. Neither bank allowed them on-site, and none of the defense contractors would even entertain the idea. You can also probably rule out obvious ones like Microsoft and HP from being big users of iPads. I can't imagine that the cashiers at Walmart, Target or the Home Depot are spending lots of time swiping around and now I'm quickly running out of companies.

I even did a part-time contract job at a company with 123,000 employees last year and not only didn't see an iPad, but they were forbidden on the corporate network and in most of the corporate offices (as was anything with a camera frankly).

oh, and FYI, jrockway actually does work at #73 on the 2012 list.