The 'Big Four' refers to the four largest firms in the world of accountancy and auditing, which include Deloitte, Ernst & Young, KPMG, and PricewaterhouseCoopers, as well as the major commercial banks in the UK such as Barclays, Lloyds, HSBC, and Royal Bank of Scotland.
Deloitte is one of the 'Big Four' international professional services firms providing audit, consulting, financial advisory, risk management, tax, and related services globally.
EY is one of the Big Four accounting firms, providing assurance, tax, transaction, and advisory services internationally. Founded in the early 20th century, it rebranded to EY in 2013 and operates in over 150 countries.
An international network of professional services firms recognized as one of the Big Four, alongside Deloitte, Ernst & Young, and KPMG. PwC offers assurance, tax, deals, and consulting services globally.
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