Revenue of the Big Four accounting / audit firms worldwide by function 2019

In 2019, Pricewaterhouse Coopers, also known as PwC, generated some 17.38 billion U.S. dollars in revenue from its assurance segment, making it the leader in the assurance market of the Big Four.

The Big Four worldwide

The Big Four consist of Pricewaterhouse Coopers, Deloitte, Ernst & Young, and KPMG. These companies are the four biggest accounting and audit firms worldwide. Combined in 2019, they brought in over 154.7 billion U.S. dollars in revenue. Out of the four, Deloitte had the greatest number of employees in 2019. Following Deloitte was Ernst & Young, while PwC had 227,005 employees and KPMG had the least. Most of Deloitte’s total revenue came from the Americas region, bringing in 24.2 billion U.S. dollars in 2019. Both PwC’s and Ernst & Young’s America’s region also collected the highest amount of revenue for them.

The Big Four in the U.S.

These four companies have the most influence in the accounting and audit sector in the United States, auditing over 80 percent of U.S. public companies. Out of the Big Four, Deloitte brought in the highest gross revenue in the United States. Following Deloitte was PwC, bringing in 15.62 billion U.S. dollars, then Ernst & Young, which brought in 13 billion U.S. dollars. KPMG brought in the least, generating just under nine billion U.S. dollars in that year.

Revenue of the Big Four accounting / audit firms worldwide in 2019, by function

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Release date

December 2019



Survey time period


Supplementary notes

* PwC, Ernst & Young - "Assurance"; KPMG - "Audit"; Deloitte - "AERS - Audit and enterprise risk services"
** Deloitte - "Consulting"; Ernst & Young, PwC & KPMG - "Advisory"
*** Deloitte - "Financial Advisory"; Ernst & Young - "Transaction Advisory Services"
Fiscal years: Deloitte ends May 31; PwC and EY end June 30; KPMG ends September 30.
Values have been rounded.

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