This is in the UK: 1 PwC (1) 2,119.9
2 KPMG 1,160.0
3 Deloitte & Touche (2) 796.0
4 Ernst & Young (3) 625.6
5 Arthur Andersen (4) 618.9
6 BDO Stoy Hayward 201.5
7 Grant Thornton 190.2
I can't remember the order worldwide, though I have the list somewhere. I know PWC is the biggest and KPMG is second. I am pretty sure that Andersen is the smallest (and has not had much growth during the last few years)