There are four audit companies -- PwC, Deloitte, EY, and KPMG -- that together audit 99% of companies in the FTSE 100. If you don't hire them, you get looked at

There are four audit companies -- PwC, Deloitte, EY, and KPMG -- that together audit 99% of companies in the FTSE 100. If you don't hire them, you get looked at funny. https://en.wikipedia.org/wiki/Big_Four_%28audit_firms%29 https://en.wikipedia.org/wiki/Big_Four_%28audit_firms%29