According to revenue figures from 2020, Deloitte was the biggest of the four companies, with around 47.6 billion U.S. dollars in revenue for that year. PricewaterhouseCoopers (PwC) generated almost 43 billion U.S. dollars in revenue in 2019. Ernst & Young (EY) and KPMG, also high rollers in the industry, generated 37.2 and 29.22 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 335,000, whereas KPMG has the fewest with around 227,000 employees.

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