The Big Four (Deloitte, PwC, EY, KPMG)

The Big Four are the four largest professional services networks—Deloitte, PwC, EY, and KPMG—that provide accounting, audit, tax, consulting, and advisory services worldwide. They help organizations ensure financial accuracy, comply with regulations, improve business performance, and navigate complex challenges. These firms serve a wide range of clients, from multinational corporations to government agencies, offering expertise that supports financial integrity, strategic growth, and risk management. Their combined global reach and extensive resources make them leaders in the professional services industry.