Revenue of the Big Four accounting/audit firms worldwide by region 2024

Deloitte reported total revenue figures of around 67 billion U.S. dollars in 2024, the highest among the Big Four accounting firms. The company also led the rankings in the Americas, but it was PwC who came out on top in the EMEA region (Europe, the Middle East, and Africa).

Accounting around the world

Deloitte generated 36.4 billion U.S. dollars in North and South America in 2024, which was slightly more than half of their revenue worldwide. A similar story was reported by PwC, with almost half of their aggregated worldwide revenue in 2024 being made in the regions of the Asia Pacific and EMEA. PwC experienced particularly strong growth in EMEA where aggregate revenues in the region increased in recent years.

Who are the Big Four?

The four biggest accounting firms worldwide are Deloitte, PricewaterhouseCoopers (PwC), Ernst and Young (EY), and Klynveld Peat Marwick Goerdeler (KPMG). Known as the Big Four, the companies have a significant oligopoly in the accounting market and generated a combined revenue worldwide of over 212 billion U.S. dollars and employed over one million people globally in 2024. Until 1989, the market had been dominated by eight accounting firms – also known as audit firms or professional services networks – but the number has since halved due to mergers and the collapse of major American accounting firm Arthur Andersen.