Who Are the Big 4? A Complete Guide to Deloitte, KPMG, EY, and PwC

How Deloitte, KPMG, EY, and PwC Became the World's Most Sought-After Employers

Every year, millions of ambitious graduates set their sights on the same four names: Deloitte, KPMG, EY, and PwC. Together these firms generate over $219 billion in annual revenue, employ more than 1.5 million people across 150+ countries, and handle the finances of the world's most powerful corporations — yet most people can't explain what actually makes one different from another.

⚙️ These four firms don't just dominate accounting — they set the agenda for global business strategy, from Fortune 500 audits to AI-driven transformation projects worth billions.

Whether you're a student eyeing your first internship or a professional thinking about a pivot, here's everything you need to know about the Big 4 — who they are, what they do, how they differ, and what it actually takes to get in.

The Big 4 at a Glance: Deloitte, KPMG, EY, and PwC

Each firm has a distinct origin story — and a distinct personality today.

1. Deloitte — Founded in London in 1845 by William Welch Deloitte, it's the oldest and largest of the four: $70.5 billion in revenue in FY2025, roughly 470,000 people, operations in 150+ countries. Deloitte is the clear leader in consulting and technology transformation, and is known for an inclusive culture that actively promotes diversity at all levels.
2. PwC (PricewaterhouseCoopers) — Born from the 1998 merger of Price Waterhouse (founded 1849) and Coopers & Lybrand (founded 1854). PwC generates around $55.5 billion a year and consistently ranks #1 in audit. If you're aiming for audit or tax, PwC is the benchmark — and it's known for some of the most structured career development in the industry.
3. EY (Ernst & Young) — Formed in 1989 when Ernst & Whinney merged with Arthur Young & Co. Revenue hit $53.2 billion in FY2025 across 406,000 staff worldwide. EY leads the Big 4 on sustainability consulting and is consistently ranked as one of the most diverse and people-first employers in professional services.
4. KPMG (Klynveld Peat Marwick Goerdeler) — A 1987 merger of four firms across Europe and the US. Revenue came in at $39.8 billion, making it the smallest of the four — but its positions in governance, risk, forensics, and regulatory advisory are second to none. It's also the firm most often cited for a more collegial, less high-pressure culture.

What Do the Big 4 Actually Do?

Here's where most people go wrong: the Big 4 aren't just accountants. Their work spans four major service lines — and consulting is now the fastest-growing of them all.

• Audit & Assurance — The original service: independently verifying that a company's financial statements are accurate and reliable for investors, banks, and regulators. Every publicly listed company in most major markets must be audited. PwC and EY are the audit heavyweights.
• Tax Advisory — Helping corporations structure deals, reduce tax liability, and stay compliant across multiple jurisdictions. Cross-border tax planning is particularly high-stakes territory. PwC and EY lead here too.
• Consulting — Strategy, digital transformation, technology implementation, change management. Deloitte dominates consulting by revenue and headcount, but all four firms compete aggressively for the same mandates. Consulting now drives 50–60% of revenue across the Big 4.
• Advisory — Risk, transactions, due diligence, forensic investigations, and regulatory support. KPMG's advisory practice is especially well regarded for governance and investigations work.

How Each Firm Actually Differs

On paper the four firms offer the same services. In practice, each has a distinct identity — and it matters when you're deciding where to apply.

• Deloitte — Biggest and boldest. If you want to work on AI, tech transformation, or large-scale strategy mandates, Deloitte is typically first on the shortlist. Its consulting arm is roughly twice the size of KPMG's, and its culture of inclusion is frequently highlighted by employees.
• PwC — The audit powerhouse. PwC handles some of the largest and most complex audit engagements in the world. Known for structured career development, clear progression paths, and deep technical training. A strong choice if audit or tax is your long-term path.
• EY — People-first. EY consistently earns the highest culture scores among Big 4 employees, with a particular reputation for diversity, sustainability, and genuine work-life support. It's also leading the pack on ESG consulting — a practice area growing faster than any other.
• KPMG — Risk and governance specialist with a human touch. KPMG is regularly described as the most collegial of the four, with less of the "up or out" pressure that defines top consulting firms. Its forensic accounting and regulatory advisory practices are genuine differentiators — less flashy than Deloitte's transformation work, but in consistent high demand.

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What It Takes to Get In

The numbers are sobering. Deloitte alone receives close to 2 million applications a year in the US and converts roughly 0.85% of them into hires. KPMG's global acceptance rate sits around 4%. But grades alone won't get you there — here's what actually moves the needle.

1. Start early with firm events and programs — All four firms run Early ID programs for first- and second-year students: Deloitte's Discovery Program, PwC's Start, EY's Career Watch, and KPMG's Future Diversity Leaders. These are direct pipelines into summer internships — and 90% of interns at firms like KPMG receive full-time offers.
2. Internships over cold applications — Hiring managers consistently prioritise candidates who've proven themselves in an internship. A cold graduate application is significantly harder to land than converting an intern offer.
3. Network before you apply — LinkedIn outreach to alumni at your target firm, career fair conversations, and virtual insight events all warm up your application before it goes through any screening process.
4. Build AI fluency — In 2026, the Big 4 have embedded AI tools across every practice area. They're not just looking for accounting knowledge — they want people who can work alongside AI systems and translate technical outputs into business decisions. SQL, Power BI, or even basic Python will set you apart.
5. Attend recruiting events — Virtual insight days, office open days, and campus presentations are where the Big 4 identify talent. They're not optional extras — they're the start of the recruiting process.

Where to Find Big 4 Events

Each firm runs recruiting and networking events throughout the year — and attending one is often the fastest way to get on a recruiter's radar. Across Deloitte, KPMG, EY, and PwC, you'll typically find:

• Virtual insight days — A behind-the-scenes look at life inside each firm. Often includes Q&As with recent graduates and partners.
• Open days and office visits — In-person events where you meet the team, experience the culture, and often fast-track a step in the interview process.
• Early talent and scholarship programs — Structured programs that bring undergraduates into internship pipelines from year one.
• Application and assessment workshops — Hosted by firm recruiters, covering cover letters, online aptitude tests, and assessment centre preparation.
• Alumni networking events — Often overlooked by students, these are where genuine relationships get built and referrals happen.

All of these events are tracked across all four firms at big4events.com/events — updated as new opportunities go live.

Your First Move

Okay, so now you know who the Big 4 are — and knowing is a start. But the candidates who actually land offers don't just know the firms; they show up to events, build relationships, and walk into their first interview already knowing which practice area fits their goals.

Whether you're drawn to Deloitte's consulting scale, PwC's audit prestige, EY's people culture, or KPMG's risk specialism — the entry point is the same: get in front of the right people before the application window opens.

📈 The candidates who land Big 4 offers don't just apply well — they show up to events, build real relationships, and know which firm fits their ambitions before interview day.

Track all upcoming Big 4 events from Deloitte, KPMG, EY, and PwC in one place. Browse current events and get notified when new opportunities go live.