Who Is the Oldest Firm Among the Big 4 Accounting Companies?

Discover why Deloitte is the oldest of the Big 4 accounting firms, founded in 1845, and learn about its key services and global impact.

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Deloitte is the oldest of the Big 4 accounting firms, with its origins tracing back to 1845. Established by William Welch Deloitte in London, it has grown to become a global powerhouse in professional services, offering audit, tax, consulting, enterprise risk, and financial advisory services.

FAQs & Answers

  1. What are the Big 4 accounting firms? The Big 4 accounting firms are Deloitte, PricewaterhouseCoopers (PwC), Ernst & Young (EY), and KPMG, known for their audit, tax, consulting, and advisory services globally.
  2. When was Deloitte founded? Deloitte was founded in 1845 by William Welch Deloitte in London, making it the oldest of the Big 4 accounting firms.
  3. What services does Deloitte offer? Deloitte offers a range of professional services including audit, tax, consulting, enterprise risk, and financial advisory services.

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If you're interested in the Big 4 accounting firms, explore our detailed comparisons of Deloitte, PwC, EY, and KPMG to understand their histories, services, and industry impact.

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