The Big 4 accounting firms—Deloitte, PwC, EY, and KPMG—collectively audit nearly 100% of the Fortune 500 and a vast majority of the world's largest public companies, banking, and government entities. They dominate the global accounting, tax, and consulting sectors, serving multinational corporations like Apple, Amazon, Microsoft, and Alphabet.
Deloitte Clients
The Big 4 are the largest accounting and auditing firms in the world: Deloitte LLP (Deloitte), PricewaterhouseCoopers (PwC), Ernst & Young (EY) and Klynveld Peat Marwick Goerdeler (KPMG). They're so big that their joint revenue in 2024 was—you guessed it—$212 billion.
History of the Big 4 accounting firms
In the late 1990s, the Big 6 became the Big 5 when Price Waterhouse merged with Coopers and Lybrand to form PricewaterhouseCoopers (later stylised as PwC). Five became four in 2001 after the insolvency of Arthur Andersen due to the firm's involvement in the Enron scandal.
Walt Disney company and PWC. We begin with Disney, in 2023 one hundred years old. At $180 billion, it is the largest entertainment corporation in the world and its auditor, Price Waterhouse Coopers (PwC) is one of the Big 4 global accountant partnerships.
Forming number 1 of the Big 4, Deloitte has some huge profile clients, such as Microsoft, Morgan Stanley, Apple and Starbucks. Deloitte operates in over 150 countries, with over 300,000 employees, with revenues in excess of nearly $60 Billion a year.
AI juggernaut Nvidia, is being audited by PwC for its 2026 fiscal year, ending January 31, 2026, according to the Nvidia Corporation Annual Review. PwC has audited Nvidia since 2004, the report notes.
On June 8, 2020, the Audit, Compliance and Valuation Committee of the Board of Trustees (the Board) approved, and on June 9, 2020, the Board approved, Deloitte & Touche LLP as the independent registered public accounting firm of The Charles Schwab Family of Funds, Schwab Capital Trust, Schwab Investments, Schwab ...
What is the starting salary at Big 4 firms?
Do all Deloitte employees go to Deloitte University? Not all but most of them do, especially the new employees. Most new recruits attend Deloitte University within the first 90 days of their employment as part of their onboarding.
Ernst and Young is the accounting firm that is charged with auditing Apple's public financial statements. Ernst & Young is one of the largest accounting firms in the world.
The Office of Inspector General contracted with the independent public accounting firm Ernst & Young LLP to audit NASA's fiscal year 2025 financial statements. The audit results found the financial statements presented fairly, in all material respects, the financial position and results of NASA's operations.
REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits in accordance with auditing standards generally accepted in the United States.
The Big 4 are the four largest global professional services networks that dominate audit and assurance, tax, and advisory work for companies and governments worldwide. They are Deloitte, PwC, EY, and KPMG.
To be more precise, here's the general consensus on how firms rank in the whole field of management consulting:
The firms. McKinsey & Company, Boston Consulting Group, and Bain & Company, collectively referred to as "MBB", are widely considered the three top and most prestigious strategy consulting firms in the world.