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 (Ernst & Young, KPMG. Deloitte and PwC) amounted to more than 134 billion U.S. dollars in 2017.

According to revenue figures from 2017, Deloitte was the biggest of the four companies, with around 38.8 billion U.S. dollars in revenue for that year. PricewaterhouseCoopers (PwC) also generated almost 37.7 billion U.S. dollars in revenue in 2017. Ernst & Young and KPMG, also high rollers in the industry, generated 31.4 and 26.4 billion U.S. dollars in revenue respectively. The Big Four generate the largest share of their revenue through their audit/assurance branches.

Each of these four firms employs more than 190,000 people a piece. Deloitte has the most employees at approximately 263,900 and KPMG has the fewest with around 197,000 employees.

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