The big, most commonly referred to as The Big 4 are the four biggest accounting firms. As of 2020, the Big 4 Accounting Firms include:The big, most commonly referred to as The Big 4 are the four biggest accounting firms. As of 2020, the Big 4 Accounting Firms include:

1.  Deloitte Touche Tohmatsu Limited
2.  PricewaterhouseCoopers (PwC)
3.  Ernst & Young (E&Y)
4.  Klynveld Peat Marwick Goerdeler (KPMG)

These accounting firms control the accounting industry. The Big Four work for both public and big private companies, non-profit groups, and high wealth individuals. The big four have a good reputation among the clients and the society.