Is Deloitte still a Big 4?

Is Deloitte Still a Big 4 Firm?

Yes, absolutely—Deloitte is not only still a Big 4 firm, but it consistently ranks as the largest among them. Alongside PwC, EY, and KPMG, Deloitte forms the elite group of global professional services networks that dominate the accounting, auditing, and advisory landscape.

The Big 4—Deloitte, PwC, EY, and KPMG—are more than just accounting giants. They’re powerhouses offering a wide range of services, from tax consulting and forensic accounting to digital transformation and sustainability strategies. In 2025, their combined revenue reached an eye-popping $219 billion, a testament to their global reach and influence.

Deloitte, in particular, has expanded far beyond traditional audit work. With deep investments in technology consulting, cybersecurity, and AI-driven analytics, it’s evolved into a one-stop solution for multinational corporations navigating complex regulatory and digital environments. Its scale and diversification have helped it maintain the top spot in the Big 4 rankings by revenue.

Despite increasing scrutiny on audit quality and calls for industry reform, the Big 4 remain dominant. While debates continue about potential breakups or regulatory changes, for now, Deloitte stands firmly at the pinnacle—global, influential, and unmistakably part of the Big 4.