In 2023, Deloitte generated some 20 billion U.S. dollars in revenue from its assurance segment, making it the leader in the assurance market among the Big Four.
The Big Four worldwide
The Big Four consist of PricewaterhouseCoopers (PwC), Deloitte, Ernst & Young (EY), and KPMG. These companies are the four largest accounting and audit firms worldwide. In 2023, they brought in more than 200 billion U.S. dollars in global combined revenue. Out of the four, Deloitte had the highest number of employees. Second in the list was Ernst & Young, followed by PwC, and KPMG. The majority of revenue generated by Deloitte came from the Americas region, as was the case with PwC and EY.
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.
