But here’s the thing—“Big 5” isn’t official. It’s a label that sticks, shaped more by reputation than revenue rankings. And that’s where it gets messy. We're far from it being a clean-cut club with a fixed membership list.
Some say it’s just the strategy trio—McKinsey, BCG, Bain. Others argue the Big 4 accounting-linked firms (Deloitte, PwC, EY, KPMG) have eaten their lunch through scale. And then there’s Accenture, lurking outside with $64 billion in FY2023 revenue, redefining what consulting even means. So who actually counts? Let’s dismantle the myth.
What Defines a "Big" Consultant? (Spoiler: It’s Not Just Size)
Revenue alone doesn’t cut it. Accenture dwarfs McKinsey—by about three times—but purists still exclude it from the elite strategy tier. Why? Because “big” here isn’t about scale. It’s about influence. Prestige. Access. The ability to walk into a Fortune 100 boardroom and have the CEO pause.
And that’s exactly where brand perception warps reality. McKinsey’s name carries weight not because of headcount—though they employ 30,000+ globally—but because of its track record shaping policy, toppling executives, and sometimes, getting tangled in scandals (looking at you, opioid crisis reports).
But Deloitte pulls in over $65 billion annually. PwC hits $53 billion. McKinsey? Estimated at $15 billion. That changes everything. If size were king, the Big 5 wouldn’t include McKinsey at all. Yet we keep them in. Because what matters is the aura.
The issue remains: are we measuring impact or optics? A McKinsey partner might advise central banks. A Deloitte team implements ERP systems for mid-sized manufacturers. Both are consultants. One shapes economies. The other keeps factories running. Different universes.
Which explains why the original “Big 5” in consulting wasn’t McKinsey-led at all. It was a group of accounting giants: Arthur Andersen, Deloitte, Ernst & Young, KPMG, and PwC. Then Andersen imploded in 2002 after Enron. Poof. Gone. The Big 5 became the Big 4. And consulting splintered.
That said, the strategy boutiques—McKinsey, BCG, Bain—carved a niche so powerful they redefined the game. They don’t audit. They don’t file taxes. They sell transformation. High-margin, high-leverage advice to the powerful. Their clients pay $500–$1,000 per hour. Some projects exceed $10 million.
Because of this, the term “Big 5 consultants” now lives in two worlds: the legacy accounting firms (with Deloitte and PwC as standouts), and the elite strategy players. Merging them is controversial—like comparing a Formula 1 driver to a freight pilot. Both fly. One does it for glory, the other for logistics.
McKinsey, BCG, Bain: The Strategy Trinity That Changed Everything
McKinsey & Company – Power, Influence, and Fallout
Founded in 1926 by James O. McKinsey, this firm practically invented modern management consulting. Their mantra—“clients first,” “raise the bar,” “build a legacy”—is drilled into every new associate. With offices in over 65 countries, they serve 90 of the Fortune 100.
They publish relentlessly. The McKinsey Global Institute drops reports that move stock prices. One 2017 paper on automation claimed up to 800 million jobs could be displaced by 2030. Media ran with it. Policymakers cited it. That’s influence.
But McKinsey’s reputation has cracks. Their work with Purdue Pharma on OxyContin sales strategies, revealed in court documents, showed how advice can cross ethical lines. Settlements exceeded $573 million. The problem is, when you advise everyone—from governments to oil companies—you can’t always control the outcome.
I find this overrated: the idea that McKinsey is untouchable. They’re not. They’ve retreated from certain sectors. And younger talent increasingly questions their legacy.
BCG – The Innovator with a Math-Heavy Edge
Boston Consulting Group, founded in 1963, introduced the growth-share matrix (cash cows, stars, question marks, dogs). A staple in every MBA program. Their DNA leans analytical. Partners often have PhDs in econ or applied math.
They’re aggressive on tech transformation. In 2022, BCG launched a $750 million venture arm—BCG X—to incubate AI startups with clients. That’s not traditional consulting. That’s co-ownership. A bold pivot.
Their culture? Slightly less hierarchical than McKinsey. More collaborative. Yet they still command rates north of $800/hour for partner time. And they’ve expanded fast—revenue grew from $2.8 billion in 2010 to over $10 billion in 2023.
Bain & Company – The Private Equity Favorite
Bain thrives in secrecy. They don’t publish earnings. Estimates put their revenue around $5 billion. What they lack in visibility, they make up for in loyalty. Their private equity practice is unmatched. Firms like Blackstone and KKR call Bain before deals close.
Why? Because Bain understands value creation levers—cost optimization, pricing strategy, portfolio synergies. They helped Staples become a national chain in the '90s. More recently, they’ve advised on billion-dollar carve-outs in aerospace and healthcare.
To give a sense of scale: a single Bain engagement in supply chain redesign once saved a client $400 million annually. That’s not incremental. That’s surgical.
Deloitte and PwC: The Giants Who Do It All
Deloitte and PwC aren’t strategy-first. They’re scale-first. Deloitte’s Consulting arm pulled in $23.4 billion in 2023. PwC’s “Consulting” segment (they call it “Advisory”) made $17.8 billion. These numbers dwarf the strategy trio combined.
But—and this is critical—their work is different. A Deloitte team might deploy SAP across 12 countries. PwC might assess cybersecurity risks after a breach. It’s high-stakes, but less about vision, more about execution.
They’ve acquired dozens of niche firms—AI shops, design studios, cloud specialists. Deloitte bought 25 companies between 2020 and 2023 alone. That’s not organic growth. That’s empire building.
And yet, they still chase the McKinsey aura. Deloitte University, their $300 million training campus in Texas, feels like a corporate Hogwarts. PwC rebranded their advisory arm as “Strategy&” after buying Booz & Company in 2013. The goal? Credibility in high-end strategy.
Honestly, it is unclear if they’ve fully cracked it. The top-tier strategy work still flows to McKinsey, BCG, Bain. But for integrated transformation—tech, people, process, risk—Deloitte and PwC are unbeatable.
Accenture vs. the Big 5: The Elephant Not in the Room
Accenture’s revenue in 2023: $64.1 billion. Their consulting workforce? Over 700,000 people. They operate in 120 countries. They’re not a challenger. They are the benchmark.
So why isn’t Accenture in the Big 5? Because traditionalists see them as implementers, not strategists. Yes, they acquired KPMG’s consulting arm in 2000. Yes, they now offer “Strategy & Consulting” as a service line. But their brand is tied to delivery—cloud migrations, ERP rollouts, AI automation.
It’s a bit like comparing a film director to a studio producer. One shapes the vision. The other makes sure the lights stay on and the crew gets paid. Both essential. But only one gets the Oscar.
Yet Accenture advises CEOs. They publish thought leadership. They’ve built innovation hubs in Dublin, Bengaluru, and São Paulo. Are they “consultants”? Absolutely. Are they elite in the same way as McKinsey? Not quite.
Big 5 Consultants Compared: Influence vs. Execution
McKinsey, BCG, Bain – The Idea Factories
These firms sell insight. A 100-page report. A three-month diagnostic. A new operating model. Their output is intellectual capital. Their clients? CEOs, ministers, private equity partners. Margin: north of 40%. Speed of promotion: fast. Burnout: real.
Deloitte, PwC – The Transformers
They sell solutions. Implementation. Integration. Their work spans audit, tax, risk, and advisory. Teams are massive—projects with 200+ consultants aren’t rare. Margins tighter. Bureaucracy heavier. But stability? High. Exit opportunities? Everywhere.
Accenture – The Scale Machine
Accenture is in a league of its own. They don’t just recommend change. They build it. They code it. They run it. Their cloud practice alone generated $13.7 billion in 2023. Their AI division employs over 75,000 specialists. This isn’t consulting. It’s industrialization.
Frequently Asked Questions
Is KPMG or EY Part of the Big 5 Consultants?
No—not in common usage. While EY and KPMG have strong advisory arms, they don’t have the same global strategy dominance as McKinsey or BCG. EY’s 2023 advisory revenue was $11.2 billion. Solid, but not commanding. KPMG doesn’t break out numbers. We’re far from it being a debate.
Do Big 5 Consultants Pay the Highest Salaries?
Yes—for entry-level roles. A first-year analyst at McKinsey earns $95,000–$110,000 in the U.S. BCG and Bain match that. Deloitte and PwC pay $75,000–$90,000. But bonuses and exit opportunities even the field. Private equity roles post-Bain can double income overnight.
Can a Small Firm Compete With the Big 5?
Yes—but not head-on. Boutique firms like Kearney, L.E.K., or Roland Berger thrive in niches: healthcare, manufacturing, M&A due diligence. They lack global reach, but offer deeper expertise. Sometimes, that’s all a client needs.
The Bottom Line: The Big 5 Are a Myth—And That’s the Point
There is no official Big 5. The term floats, reshapes, adapts. Today, it’s often McKinsey, BCG, Bain, Deloitte, PwC. Tomorrow, it might include Accenture. Or split into two categories entirely.
What’s clear is this: influence isn’t proportional to revenue. McKinsey’s $15 billion operation punches above its weight because of perception, legacy, and a relentless focus on elite clients. Deloitte moves markets through volume. Accenture redefines the game through scale.
I am convinced that the real divide isn’t firm size—it’s intent. Do you want to transform thinking? Go to the strategy firms. Do you want to transform operations? Call Deloitte or PwC. Do you want to rebuild your entire digital backbone? Accenture’s already on speed dial.
The future? Blurred lines. Firms are converging. McKinsey now has a tech implementation arm—McKinsey Digital. BCG bought a design agency. Deloitte hires ex-Bain partners. The walls are cracking.
So who are the Big 5 consultants? They’re whoever holds the microphone when the C-suite is listening. And that changes everything.