: Earned roughly $40 billion in 2021 and is known for strong tax and transaction advisory.

: Often ranked first by revenue, earning approximately $50 billion in 2021 .

As of early 2026, these firms collectively generate over in annual revenue and employ more than 1.5 million professionals globally.

: Consistently one of the top two, with 2021 revenues around $45 billion.

: Beyond standard accounting, they offer digital transformation, cybersecurity, valuation, and risk management across more than 150 countries. Career & Lifestyle Impact

: They audit the vast majority of public companies worldwide, providing a level of "high auditor reputation" that is critical for financial markets .