According to revenue figures from 2018, Deloitte was the biggest of the four companies, with around 43.2 billion U.S. dollars in revenue for that year. PricewaterhouseCoopers (PwC) generated almost 41.3 billion U.S. dollars in revenue in 2018. Ernst & Young (EY) and KPMG, also high rollers in the industry, generated 34.8 and 29 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 286,200 and KPMG has the fewest with around 207,000 employees.