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Big Four Accounting Firms: Growth, Mergers, & Impact

The Big Four Accounting Firms—Deloitte, PricewaterhouseCoopers (PwC), Ernst & Young (EY), and KPMG—form the ultimate hierarchy in today’s international accounting and professional services arena.

Besides audit services, tax preparation, consulting, and advisory functions, they have marked prestige in serving some of the largest worldwide companies and government entities. 

This blog will showcase to you how these big four accounting firms rule the financial industry.

1. Deloitte CEO: Joe Ucuzoglu Headquarters: London, UK

Deloitte, founded in 1845 by William Welch Deloitte, is a global leader in professional services and one of the "Big Four" accounting firms. Operating in over 150 countries, Deloitte offers expertise in financial reporting, tax, and consulting.

In 2024, it ranked number one in the industry, earning $67.2 billion in revenue. With over 415,000 employees, Deloitte serves clients from startups to Fortune 500 companies, solidifying its reputation for excellence worldwide.

2. PwC (PricewaterhouseCoopers) CEO: Robert E. Moritz Headquarters: London, UK

PwC, founded in 1849, is a global leader in professional services and one of the "Big Four" accounting firms. With offices in over 150 countries, it combines vast expertise with a strong international presence.

In 2024, PwC reported $55.4 billion in revenue and employed over 330,000 professionals, serving clients across industries with excellence.

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