What does Big Four mean?

Big Four meaning in Finance Dictionary

In the UK the four big clearing banks: Lloyds TSB, Barclays, HSBC and Royal Bank of Scotland.

Big Four meaning in Law Dictionary

The largest firms for accounting. They handle public and private businesses. These are typically Deloitte Touche Tohmatsu, cost water residence coopers, Ernst & Young, and PMG. It started in 2002 after 8 joined into 4.