It is predicted that Amazon AWS runs at a huge margin [2]
Of course it's possible that these number are skewed by some Irish Whiskey Double Dutch Vegemite Sandwich tax avoidance system.
[1] http://venturebeat.com/2013/10/24/red-is-the-new-green-for-a...
[2] http://venturebeat.com/2013/09/05/amazons-mountain-of-margin...