Deloitte is the biggest auditor in the world by revenue and employee count. As of 2024–2025, it leads the "Big 4"—comprising Deloitte, PwC, EY, and KPMG—with over $70 billion in annual revenue and roughly 457,000 employees.
The top 10 largest accounting firms by revenue:
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).
The Big 8 Accounting Firms History
The Top Accounting Firms in India
Mazars, ranked tenth in the Accountancy league table of firms, will be responsible for auditing Goldman Sachs International from 2021. This includes the bank's London and Frankfurt businesses. The firm is expected to earn around $5m (£4m) in fees when it takes over from PwC.
Our internal control over financial reporting as of January 28, 2023, has been audited by Ernst & Young LLP, the independent registered public accounting firm who has also audited our consolidated financial statements, as stated in their report which appears on this page.
The four common types of auditors are Internal Auditors (evaluate company operations for management), External Auditors (independent review of financial statements for outside parties), Government Auditors (ensure compliance with laws for public agencies like the IRS), and Forensic Auditors (investigate financial fraud for legal proceedings). These roles focus on different areas, from internal controls and risk management to financial reporting accuracy and fraud detection.
In general, the PCAOB inspects each firm either annually or triennially (i.e., once every three years). If a firm provides audit opinions for more than 100 issuers, the PCAOB inspects them annually.
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.
Size. If the size is an issue for you then it's worth noting that MBB is around a tenth of the size of the Big 4. As of 2022, McKinsey employs over 37,000 people working across 130+ offices in 65+ countries. BCG has over 90 offices in more than 50 countries around the world and also employs about 25,000 people.
The effectiveness of the Firm's internal control over financial reporting as of December 31, 2024, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears herein.
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.
Mitch Mantua. Mitch Mantua heads Internal Audit for Charles Schwab & Co., Inc. and its affiliates. The Internal Audit function provides an independent and objective appraisal of the company's business operations and helps the company meet its commitment to operating discipline.
To be in the top 1% of US earners, you generally need an income well over $700,000 nationally, with figures around $794,000 cited for recent years, but this varies significantly by state, requiring over $1 million in places like Connecticut and Massachusetts, while being around $400,000-$450,000 in lower-cost states like West Virginia and Mississippi.
Here are the top 6 richest accountants globally: