Big 3 Consulting Firms: McKinsey, BCG and Bain

Author: Taylor Warfield, Former Bain Manager and interviewer

Last Updated: April 21, 2026

 

The Big 3 consulting firms are McKinsey & Company, Boston Consulting Group (BCG), and Bain & Company. Also known as MBB, these three strategy consulting firms are the most prestigious in the world, generating over $40 billion in combined annual revenue and accepting less than 1% of applicants.

 

In this guide, I will break down what each firm does, how their salaries compare, what the culture is like at each firm, and exactly how to get hired. Having spent years at Bain as a manager and interviewer, I have seen firsthand what separates these firms from everyone else in consulting.

 

But first, a quick heads up:

 

McKinsey, BCG, Bain, and other top firms accept less than 1% of applicants every year. If you want to triple your chances of landing interviews and 8x your chances of passing them, watch my free 40-minute training.

 

What Are the Big 3 Consulting Firms?

 

The Big 3 consulting firms, often called MBB (McKinsey, BCG, Bain), are the three largest and most prestigious strategy consulting firms in the world. They advise Fortune 500 companies, governments, and private equity firms on their most important business decisions.

 

McKinsey was founded in 1926, BCG in 1963, and Bain in 1973. According to publicly available financial data, McKinsey generated approximately $18.8 billion in revenue in 2024, BCG brought in $14.1 billion, and Bain earned roughly $7 billion. Together, these three firms employ over 90,000 people across hundreds of offices worldwide.

 

The term "Big 3" distinguishes these firms from the Big 4 accounting firms (Deloitte, PwC, EY, KPMG) that also offer consulting services. While the Big 4 are larger by total revenue, the Big 3 focus almost exclusively on high-level strategy work and charge roughly double the daily rates of Big 4 strategy units. For a deeper look at all the top firms, see our guide to the most prestigious consulting firms.

 

Here is a comparison of the Big 3 consulting firms by key metrics:

 

Metric

McKinsey

BCG

Bain

Founded

1926

1963

1973

2024 Revenue

~$18.8B

~$14.1B

~$7B

Employees

~40,000

~37,000

~18,000

Global Offices

130+

100+

65+

Headquarters

New York

Boston

Boston

Acceptance Rate

<1%

<1%

<1%

 

What Does Each Big 3 Firm Specialize In?

 

All three firms do high-level strategy consulting across nearly every industry. However, each has a distinct reputation, culture, and area of strength that sets it apart.

 

What Is McKinsey Known For?

 

McKinsey & Company is the oldest and largest of the Big 3. Founded in Chicago in 1926 by James McKinsey, the firm pioneered the management consulting industry. McKinsey is known for its data-driven, analytically rigorous approach to problem solving.

 

McKinsey is often called the "CEO factory" because more Fortune 500 CEOs are McKinsey alumni than from any other single organization. Notable alumni include Sundar Pichai (CEO of Google), James Gorman (former CEO of Morgan Stanley), and Sheryl Sandberg (former COO of Meta).

 

The firm is also leading the charge on AI in consulting. According to Business Insider, McKinsey deployed roughly 25,000 AI agents in 2025 to work alongside its 40,000 human consultants. Approximately 40% of McKinsey's revenue now comes from AI and technology advisory work.

 

McKinsey operates under a "one firm" principle, meaning best practices, revenue, and people are shared across offices globally. This gives them the ability to assemble the best team for any project regardless of geography.

 

What Is BCG Known For?

 

Boston Consulting Group was founded in 1963 by Bruce Henderson. BCG reshaped the consulting industry by developing branded strategy frameworks like the BCG Growth-Share Matrix, which categorizes a company's business units into Stars, Cash Cows, Dogs, and Question Marks based on market growth and market share.

 

BCG is widely regarded as the most innovative of the Big 3. The firm was the first to make a major push into digital consulting through BCG Digital Ventures, and it has invested heavily in data science and AI. In 2024, AI consulting accounted for approximately 20% of BCG's revenue, with projections to reach 40% by 2026 according to the Financial Times.

 

BCG has a more collaborative and less hierarchical culture than McKinsey. The firm's culture emphasizes creative problem solving, and consultants are encouraged to challenge conventional thinking. Notable BCG alumni include Indra Nooyi (former CEO of PepsiCo) and Benjamin Netanyahu (Prime Minister of Israel).

 

What Is Bain Known For?

 

Bain & Company was founded in 1973 by Bill Bain, a former BCG vice president. Bain revolutionized the consulting industry by focusing on long-term client relationships rather than one-off projects. When Bain started, it took only one client per industry and worked to maximize value for that single client over time.

 

Bain is the clear leader in private equity consulting. The firm has worked on more than half of the world's largest buyout deals. Bain Capital, the private equity firm co-founded by Mitt Romney, was spun out of Bain & Company and manages over $180 billion in assets.

 

Bain is consistently ranked as one of the best places to work. The firm's motto is "A Bainie never lets another Bainie fail," and it has won multiple Glassdoor "Best Places to Work" awards. Bain emphasizes results over reports, focusing on measurable client outcomes rather than polished slide decks. Notable alumni include Meg Whitman (former CEO of HP) and John Donahoe (former CEO of eBay).

 

How Do Big 3 Consulting Salaries Compare?

 

Big 3 consulting salaries are among the highest in any industry for new graduates. According to data from the 2025 Management Consulting Salary Report, MBA hires at MBB firms earn a base salary of $190,000 to $192,000 with total first-year compensation exceeding $260,000. Undergraduate hires earn base salaries around $110,000.

 

It is worth noting that MBB base salaries have been flat since 2023, marking the third consecutive year without increases. Firms have attributed this to productivity gains from AI and lower consultant attrition. However, total compensation remains significantly higher than at Big 4 firms and most other employers.

 

MBB salary packages are generally non-negotiable at the base salary level. All three firms pay the same base salary regardless of which office you join, unlike Big 4 firms that adjust by location. For a detailed breakdown of consulting pay at every level, see our consulting career path and salary guide.

 

Here is a salary comparison across Big 3 firms by career level:

 

Level

Base Salary

Performance Bonus

Signing Bonus

Total Comp

Undergrad Hire

$105K-$112K

$15K-$22K

$5K

$125K-$139K

MBA Hire

$190K-$192K

$35K-$63K

$30K-$35K

$255K-$290K

Manager

$175K-$250K

$50K-$80K

N/A

$225K-$330K

Principal

$300K-$400K

$100K-$200K

N/A

$400K-$600K

Partner

$570K-$1M+

$200K-$500K+

N/A

$1M-$3M+

 

Bain slightly edges out McKinsey and BCG on MBA base salary at $192,000, while McKinsey tends to offer the highest performance bonuses. All three firms also provide comprehensive benefits including health insurance, retirement contributions, tuition reimbursement, and parental leave.

 

What Is the Career Path at a Big 3 Firm?

 

The career path at all three Big 3 firms follows a structured progression with five main levels. You can move from entry level to partner in roughly 10 to 12 years if you consistently perform well. Promotions happen every two to three years on a set timeline.

 

All three firms use an informal "up or out" policy. If you are not promoted within the expected timeframe, the firm will encourage you to transition out. According to internal data from major firms, only about 5% to 10% of entry-level consultants eventually make partner.

 

The career levels use different titles depending on the firm:

 

Level

McKinsey

BCG

Bain

Junior

Business Analyst

Associate

Associate Consultant

Senior

Associate

Consultant

Consultant

Manager

Engagement Manager

Project Leader

Manager

Principal

Associate Partner

Principal

Principal

Partner

Senior Partner

Managing Director/Partner

Partner

 

One key difference is that Bain allows high performers to accelerate through the hierarchy faster than the standard timeline. At McKinsey and BCG, the promotion pace is more standardized. Bain also lets consultants choose their own performance manager (mentor), while McKinsey and BCG assign mentors.

 

How Does the Culture Differ Across McKinsey, BCG, and Bain?

 

While all three firms attract top talent and do similar work, the cultures feel distinctly different. In my experience at Bain, I found the culture to be collaborative and supportive. Having also worked with consultants from McKinsey and BCG, the cultural differences are real and worth considering when choosing which firm to target.

 

Dimension

McKinsey

BCG

Bain

Overall Vibe

Intellectual, traditional

Creative, collaborative

Supportive, results-driven

Hierarchy

More formal

Flatter, open

Flat, team-oriented

Work-Life Balance

Demanding

Moderate

Best of the three

Approach

Facts and frameworks

Innovation and ideas

Measurable client results

Specialization

Early industry focus

Early industry focus

More generalist early on

Glassdoor Rating

4.2 / 5.0

4.3 / 5.0

4.6 / 5.0

 

McKinsey employees often refer to the firm simply as "The Firm." It has a more traditional, buttoned-up environment where data and analysis take center stage. BCG encourages more creative thinking and has a flatter structure where junior consultants have more direct interaction with partners. Bain has a close-knit, collegial atmosphere where teamwork is paramount.

 

Bain has consistently been the only MBB firm to make Glassdoor's top 100 best places to work list over the past decade. The firm's CEO has a 98% approval rating on Glassdoor, the highest among all MBB leaders.

 

What Is the Big 3 Consulting Interview Process?

 

The interview process at all three Big 3 firms is famously rigorous. Each firm screens candidates through multiple rounds, and the overall acceptance rate is below 1%. Based on recruiting data, top firms receive over 200,000 applications per year globally.

 

The process at each firm typically includes four stages:

 

  • Resume and Application Screen: Firms evaluate your school, GPA, work experience, and extracurriculars. Attending a target school significantly increases your chances of getting an interview.

 

  • Online Assessments: McKinsey uses the Solve assessment (a digital, gamified test). BCG uses the Casey chatbot simulation. Bain uses SOVA or TestGorilla assessments depending on the office. These assessments filter out roughly 50% to 70% of remaining candidates.

 

  • First-Round Interviews: Typically two interviews, each lasting 30 to 45 minutes. Each interview includes a case interview (a business problem you solve live) and a fit or behavioral interview. You must pass both interviews to advance.

 

  • Final-Round Interviews: Two to three additional interviews with senior partners. The cases are more complex and the behavioral questions probe deeper into leadership, teamwork, and impact. An offer requires positive evaluations from all interviewers.

 

If you want to learn case interviews quickly, my case interview course walks you through proven strategies in as little as 7 days, saving you hundreds of hours of trial and error.

 

For a complete walkthrough of when to apply and what to expect, see our consulting recruiting timeline.

 

How Do the Big 3 Compare to Big 4 Consulting Firms?

 

The Big 4 (Deloitte, PwC, EY, KPMG) all have strategy consulting arms that do similar work to the Big 3. However, there are meaningful differences in prestige, pay, and career trajectory. For a full comparison, see our guide to tier 2 consulting firms.

 

Factor

Big 3 (MBB)

Big 4 Strategy

Daily Billing Rate

~$10,000-$15,000 per consultant

~$5,000-$8,000 per consultant

MBA Base Salary

$190K-$192K

$155K-$178K

Time to Partner

~9-12 years

~15+ years

Work Focus

Pure strategy

Strategy + implementation

Partner Compensation

$1M-$3M+

30-40% less than MBB

Exit Opportunities

Strongest (PE, C-suite, VC)

Strong (corporate, industry)

 

Big 4 strategy units can be a great fit if you prefer a broader service platform, want more implementation-focused work, or want a slightly better work-life balance. However, if your goal is maximum prestige, the fastest promotion timeline, or the strongest exit opportunities into private equity and C-suite roles, the Big 3 are the clear choice.

 

What Are Exit Opportunities After Big 3 Consulting?

 

One of the biggest reasons people join MBB firms is the career options it opens up afterward. According to research that analyzed LinkedIn profiles of former MBB consultants, approximately 62.8% of departing consultants joined private companies, while 18.7% went to public companies.

 

The most common exit paths from Big 3 consulting include:

 

  • Private Equity and Venture Capital: PE firms actively recruit MBB consultants, especially from Bain given its strong private equity practice. Former consultants join firms like KKR, Blackstone, and Bain Capital in deal teams and portfolio operations roles.

 

  • Corporate Strategy and Leadership: Nearly 31% of MBB alumni take director-level or above roles at major corporations. McKinsey's alumni network is particularly strong for C-suite placements, which is why it earned the "CEO factory" nickname.

 

  • Tech Companies: Product management, strategy, and operations roles at companies like Google, Amazon, and Apple are popular destinations. The analytical and problem-solving skills from MBB translate directly to tech.

 

  • Startups and Entrepreneurship: About 30.6% of MBB alumni join companies with $25 million or less in annual revenue, attracted by the visibility, ownership, and speed of startup environments.

 

  • Non-Profit and Government: Some consultants leverage their MBB experience for policy, government advisory, or social sector leadership roles.

 

The exit opportunities are strong from all three firms, but McKinsey has the most expansive alumni network. Bain's alumni culture is the tightest knit. For more on what consultants do day to day and the skills you will build, see our guide on what consultants actually do.

 

How Do You Get Hired by a Big 3 Consulting Firm?

 

Getting hired by McKinsey, BCG, or Bain requires a combination of the right background, strong networking, a polished resume, and excellent case interview skills. Based on my experience coaching thousands of candidates, here are the key steps.

 

1. Build the right profile. MBB firms recruit most heavily from the top 20 to 25 undergraduate programs and top 15 to 20 MBA programs. A GPA of 3.5 or higher is generally expected. Strong extracurriculars and leadership experience also matter. For more details, check out our guide on how to get into consulting.

 

2. Network early and consistently. Networking is how many candidates get referrals, which significantly improve your chances of getting an interview. Attend firm-hosted events, reach out to consultants on LinkedIn, and ask for informational interviews starting 6 to 12 months before you plan to apply.

 

3. Craft a standout resume. Your consulting resume needs to be one page, quantify your impact with specific numbers, and highlight leadership and analytical skills. Every bullet should start with a past-tense action verb and include a measurable result.

 

4. Master case interviews. Case interviews are the single biggest hurdle in the MBB hiring process. You will need to demonstrate structured thinking, strong mental math, clear communication, and sound business judgment. Plan to practice at least 30 to 50 cases before your interviews.

 

5. Prepare for fit interviews. McKinsey calls these Personal Experience Interviews (PEI). BCG and Bain call them fit or behavioral interviews. You will need 3 to 5 well-prepared stories that demonstrate leadership, teamwork, conflict resolution, and impact. If you want to prepare for 98% of fit interview questions in just a few hours, check out my fit interview course.

 

Frequently Asked Questions

 

Is McKinsey Better Than BCG and Bain?

 

McKinsey is generally considered the most prestigious of the Big 3 due to its size, revenue, and alumni network. However, "better" depends on your priorities. BCG leads in innovation and digital consulting. Bain has the strongest culture and work-life balance. All three firms will open the same caliber of career doors.

 

Why Are the Big 3 Called MBB?

 

MBB stands for McKinsey, BCG, and Bain, using the first letter of each firm. It is the most common shorthand used in the consulting industry to refer to these three firms collectively. You will also hear them called the "Big 3" or "top 3" consulting firms.

 

How Hard Is It to Get Into a Big 3 Consulting Firm?

 

Extremely hard. MBB firms accept less than 1% of applicants, making them more selective than most Ivy League schools. However, with the right preparation, it is achievable. Candidates who attend target schools, have strong GPAs, network effectively, and practice case interviews extensively have a much higher success rate.

 

What GPA Do You Need for Big 3 Consulting?

 

Most MBB firms look for a GPA of 3.5 or higher on a 4.0 scale. Some offices and interviewers have a stricter cutoff of 3.6 or 3.7. However, a lower GPA can be offset by exceptional work experience, leadership roles, or an advanced degree from a top program.

 

Are Big 3 Consulting Salaries Worth the Long Hours?

 

MBB consultants typically work 55 to 70 hours per week, with occasional spikes above that. Total first-year compensation exceeds $260,000 for MBA hires, which is among the highest of any entry-level role. Beyond the paycheck, the training, network, and exit opportunities make MBB experience valuable long after you leave. Most former consultants say the experience was worth it even if the hours were demanding.

 

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