I dont know if somebody has already posted this.
I came across this document while searching for an Audit firm.
This is an old file, so please dont comment "Its outdated.." or "This is wrong information...my firm has better ranking"..
I havn't made this list.. So I am not taking credit for the efforts put in making the same.
The main text of the study is not readable. But the list of firms and ranking is readable (And thats what is important for us)
I hope this is useful