The Big Four
are the four largest international professional services networks
and professional services
offering audit, assurance, tax, consulting, advisory, actuarial,
corporate finance and legal services. They handle the vast majority of audits
for publicly traded companies
as well as many private companies
, creating an oligopoly
in auditing large companies. It is reported that the Big Four audit all
but one of the companies that constitute the FTSE 100, and 240 of the
companies in the FTSE 250, an index of the leading mid-cap listing
The Big Four firms are shown below, with their latest publicly available data.
KPMG, PricewaterhouseCoopers, Ernst and Young, and Deloitte.