Big Four (or Big Five, Big Six, Big Eight)

Big Four (or Big Five, Big Six, Big Eight)

The largest accounting firms in the United States as measured by revenue.

Notes:

Most of the auditing for public companies is done by these firms. This term is constantly changing because of mergers or other significant events. At one point there was a Big Eight, then a Big Six, then a Big Five etc.

See also: Accounting, Audit, Auditor's Report, Big Three, GAAP