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Big Four Auditing Firms
The global Big Four auditing firms handle the vast majority of audits for publicly traded companies, and also private companies. Worldwide, by revenue, the Big Four are:
PricewaterhouseCoopers, $25.2bn (1);
Deloitte Touche Tohmatsu, $23.1bn (2);
Ernst & Young, $21.1bn (3); and 
KPMG, $19.8bn (4).
Big Four in the News:
* source:
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