Deloitte recorded 4.8% annual revenue growth in its most recent financial year.Jack Taylor/Getty Images The Big Four — EY, Deloitte, KPMG, and PwC — are the world's largest accounting and consulting firms. The firms pull in billions annually, but are at a transformative moment as AI reshapes the industry. This is how the Big Four said they performed in their most recent financial years. Deloitte, EY, KPMG, and PwC make up the world's largest professional services firms — known as the Big Four. T ...