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Audit/Accounting firms - the Big Four - statistics & facts

The term Big Four, in relation to auditing and accounting, refers to the four major professional services networks specializing in accountancy and professional services. The Big Four companies serve as auditors for the majority of publicly traded companies, and deal with a number of private companies as well. The combined revenue of the Big Four (EY, KPMG, Deloitte, and PwC) amounted to more than 167 billion U.S. dollars in 2021.

According to revenue figures from 2021, Deloitte was the biggest of the four companies, with around 50 billion U.S. dollars in revenue for that year. PricewaterhouseCoopers (PwC) generated almost 45.2 billion U.S. dollars in revenue in 2021. Ernst & Young (EY) and KPMG, also high rollers in the industry, generated 40 and 32.13 billion U.S. dollars in revenue respectively. PwC and EY generate the largest share of their revenue through their audit/assurance branches, while Deloitte and KPMG generate the largest share of their revenue through their advisory/consulting branches.

Each of these four firms employs more than 200,000 people a piece. Deloitte has the most employees at approximately 345,000, whereas KPMG has the fewest with around 236,000 employees.

Interesting statistics

In the following 5 chapters, you will quickly find the 29 most important statistics relating to "Audit/Accounting firms - the Big Four".


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