The Big Four accounting firms are the four largest professional services firms in the world that provide auditing, transaction advisory, tax, consulting, risk and actuarial services. These firms are Deloitte, PricewaterhouseCoopers (PwC), KPMG and Ernst & Young (EY). The Big Four is the nickname used to refer to these four accounting firms in the United States, according to revenue. The Big Four offer a wide range of services beyond auditing.
These include tax, strategic and management advisory services, valuation, market research, insurance and legal advice. They audit most public and private companies around the world. The Big Four have become increasingly important in the business world. They are relied upon to provide accurate financial information and advice on a variety of topics.
As such, they have become a major force in the global economy. The Big Four have also been criticized for their lack of competition and their potential conflicts of interest. They have been accused of providing biased advice and of not being transparent about their fees. Despite these criticisms, the Big Four remain an integral part of the global economy.