The phrase "" typically refers to the four largest professional services networks in the world: Deloitte, PwC (PricewaterhouseCoopers), EY (Ernst & Young), and KPMG. These firms dominate the global market for auditing , tax, consulting, and advisory services. The Core Firms

Working at a Big 4 firm is often viewed as a "career launchpad" due to the intensive training and prestigious pedigree it provides. Big 4 Companies: Deloitte, PwC, EY & KPMG (2026) | IE

: They originated from the "Big Eight" firms of the 20th century. Mergers and the 2002 collapse of Arthur Andersen (due to the Enron scandal) eventually left only these four giants.

: The smallest of the four by revenue ($32.1 billion in 2021) but still a massive global player. Why They are "So Big"