What Is MBB? Meaning of MBB Consulting (McKinsey, BCG, Bain)

MBB stands for McKinsey & Company, Boston Consulting Group (BCG), and Bain & Company, the Big Three strategy consulting firms. This guide covers what MBB consulting firms do, 2027 pay, selectivity, exits, hiring, and how to choose among them.

What does MBB stand for?

The MBB full form is McKinsey & Company, Boston Consulting Group, and Bain & Company:

• M: McKinsey & Company.
• B: Boston Consulting Group (BCG).
• B: Bain & Company.

MBB also has informal meanings in texting; this page covers the consulting meaning.

The same three firms are also called the Big 3. For how they compare with Deloitte, PwC, EY, and KPMG, see our Big 3 vs Big 4 consulting comparison.

The acronym does not mean the firms only write strategy recommendations. Their public capability pages describe work across transformation, operations, organization, technology, analytics, implementation, and other specialist areas. What you do depends on the office, practice, role, and project.

MBB at a glance

BCG published its 2025 revenue and headcount in an April 23, 2026 release. McKinsey and Bain do not publish revenue, so their figures are the estimates on Wikipedia, and founding years and headquarters come from each firm's Wikipedia entry (McKinsey, BCG, Bain). The company names link to each firm's careers page.

MBB pay, selectivity, and exits in 2027

Pay. McKinsey, BCG, and Bain raised US starting base for the 2027 class to $120,000 pre-MBA and $200,000 post-MBA, so all three now pay the same at both entry levels (Poets&Quants, October 27, 2026, reporting offer-letter data). The 2026 class figures come from GMAC, whose rows are scoped to master's graduates:

Pre-MBA covers undergraduate and master's hires. For the 2026 class, all three firms paid MBA hires a $30,000 signing bonus, and MBA performance bonuses ran up to $40,000 at McKinsey, $47,500 at BCG and $63,000 at Bain. The Poets&Quants report puts the raise at about 1% to 2% a year since the last increase in August 2022. Poets&Quants has the 2025 pay breakdown. Pay outside the US differs, so check the offer for your office.

Selectivity. None of the firms publishes an acceptance rate. The most cited estimate, attributed by Hacking the Case Interview to a former McKinsey global managing partner, is that about 1% of roughly 200,000 yearly applicants get an offer; the same page estimates 1% to 3% for BCG and Bain. The path from application to offer is broken down step by step in how to get into MBB.

Exits. An analysis of 1,644 people who left McKinsey, Bain, or BCG between August and November 2025, reported by Poets&Quants, found the largest destinations were business consulting and services (16.6%), financial services (13.7%), and software (13.1%), with 5.1% going to venture capital or private equity. 7.7% moved into C-suite roles and 6.3% became founders. The full range of paths is in the consulting exit opportunities guide.

What do McKinsey, BCG, and Bain actually do?

MBB teams help organizations make and execute consequential decisions. Public firm materials show overlapping portfolios, including:

Not every office offers every capability at the same scale. Read the role description and practice pages rather than relying on the MBB label.

How are the three firms different?

The safest comparison is based on observable choices:

Entry pay is now identical across the three (see the pay table above), and offers still differ by geography, level, and year. Compare the written offers you actually receive. The consulting salary report can provide market context without pretending one number covers every candidate.

MBB versus Big Four and other firms

MBB is one segment of a much larger consulting market. Big Four firms, strategy specialists, operations firms, technology consultancies, and boutiques may offer work that better matches a candidate's desired industry, location, or delivery model.

For the career trade-offs, see Big 4 vs MBB consulting.

Who does MBB hire?

The firms recruit students, advanced-degree candidates, MBAs, and experienced professionals, but available entry points vary. Common paths include:

• Undergraduate or master's internships and full-time generalist roles.
• MBA internships and post-MBA roles.
• Advanced-degree programs for PhD, medical, law, and other candidates where offered.
• Experienced-hire and specialist roles in industry, analytics, technology, design, implementation, and functions.

Eligibility language and dates can change. Verify them on the current posting and do not apply based on a previous cycle's calendar.

What is the MBB interview process?

An MBB process may include application screening, an online or digital assessment, case interviews, and behavioral or experience questions. The sequence and count vary by firm, role, office, and recruiting channel.

Do not assume every McKinsey case is interviewer-led or every BCG and Bain case is candidate-led. Interviewers can vary the degree of guidance, and special roles can use different formats.

Practice the experience side of MBB interviews

Rehearse leadership, influence, motivation, and setback examples with follow-up questions.

Practice behavioral questions

How should you order MBB applications and interviews?

Apply wherever the role fits; do not submit to one firm only because an acronym grouped three firms together. If you can influence scheduling, use this order:

1. Protect every official deadline and assessment window.
2. Avoid preventable collisions between interviews.
3. Leave a small amount of time between processes to apply lessons.
4. Do not intentionally use a firm you would accept as a disposable mock interview.
5. If offers overlap, compare the actual office, role, people, and terms.

Before the first interview, test your reasoning in a realistic case, then train the skill that the attempt exposed rather than chasing a universal case count. Start with the GreenBite guided case. If the process is still unfamiliar, review the case interview lesson before the next attempt.

How do you choose among McKinsey, BCG, and Bain?

Score the options only after gathering role-level evidence:

Sources

• McKinsey: capabilities
• McKinsey: interviewing
• BCG: capabilities
• BCG: careers
• Bain: industries and capabilities
• Bain: hiring process
• Poets&Quants, October 27, 2026: McKinsey, Bain, BCG boost starting MBA pay (2027 base), checked November 4, 2026
• BCG press release, April 23, 2026: 2025 revenue and employees, checked November 4, 2026
• Wikipedia: Big Three (management consultancies), 2025 estimates, checked November 4, 2026
• Wikipedia: McKinsey & Company, Boston Consulting Group, Bain & Company, founding years and headquarters, checked November 4, 2026
• GMAC: consulting salaries for MBA and master's grads (2026)
• Poets&Quants: consulting pay, what MBAs earned in 2025
• Hacking the Case Interview: McKinsey acceptance rate
• Poets&Quants: where McKinsey, Bain and BCG professionals are headed