Learn › General Knowledge › Big business

The Big Four accounting firms

The Big Four accounting firms are Deloitte, EY, KPMG and PwC. In 2024 they audited 87% of FTSE 350 companies.

How many4 firms

As of9 October 2026

SourceDeloitte UK - About Deloitte

Memory hook

D-E-K-P in alphabetical order: Deloitte, EY, KPMG, PwC. There were five until Arthur Andersen was dissolved in 2002, after the Enron scandal.

The full list

The Big Four 4

The four networks the FRC and CMA name together as the Big Four; they audited 87% of FTSE 350 companies in 2024.

Deloitte
EY
KPMG
PwC

Can you name them all?

Test yourself

Not on the list

BDO, Grant Thornton, Forvis Mazars, RSM: The FRC counts them with the Big Four as the eight largest UK audit firms, but groups them with all other non-Big Four firms.
Arthur Andersen: Former member of the Big Five.

Questions

Who are the Big Four accounting firms?

The Big Four accounting firms are Deloitte, EY, KPMG and PwC. In 2024 they audited 87% of FTSE 350 companies.

Which firms are on the list?

Deloitte, EY, KPMG and PwC.

What is an easy way to remember them?

D-E-K-P in alphabetical order: Deloitte, EY, KPMG, PwC. There were five until Arthur Andersen was dissolved in 2002, after the Enron scandal.

More lists

The richest people in the world Trillion-dollar companies The largest companies in the world by revenue Dow Jones 30 companies Big Tech companies UK Prime Ministers since 1945 All lists

Each name checked against at least two sources, one of them Deloitte UK - About Deloitte, on 9 October 2026. Next review by 28 September 2027.
Games · Learn · Atlas · Feedback · Privacy · Contact