Big 3 Consulting Firms 2026: McKinsey, BCG, and Bain

Who the Big 3 consulting firms are, and when each began

Three firms, three founding years, and three different places the year is published.

Thirty-seven years separate the first from the second, and ten separate the second from the third. The three grew up in three different decades of the trade.

BCG writes no founding year in plain prose. The year is readable because its history page signs a closing quote with the dates of its founder's tenure. The same page dates two of the firm's exports. "In 1964 he developed a new approach to marketing a consulting firm: Perspectives, brief and highly provocative essays on strategy." And "The growth share matrix, created in 1968, helps companies decide how to prioritize different businesses by their degree of, and potential for, profitability."

Bain's about page gives its year inside a subordinate clause and develops nothing around it. It names no founder and tells no origin story.

One frequent mix-up has a published answer. Bain & Company advises clients and dates itself to 1973. Bain Capital invests and writes on its own about page that it was "Founded as a private partnership in 1984". Two firms, two dates, two businesses, and the 1984 date settles which one a candidate is reading about.

What each firm publishes about its own size

BCG publishes both a headcount and a revenue figure. McKinsey and Bain publish neither. That gap is the first measurable fact about these three firms, and every size comparison between them runs into it.

Two published numbers give a third by division. BCG's 14.4 billion dollars over 33,500 people works out at 429,851 dollars per head, so roughly 430,000 dollars of revenue per employee per year. The check runs the other way. 33,500 times 430,000 gives 14.405 billion. The firm prints the two inputs side by side and prints no such ratio, so the per-head number is ours.

A partnership can still publish office-level detail with no financial statement behind it. McKinsey's German recruiting page gives a floor for each of its seven German offices and Vienna, from more than 570 consultants in Munich to more than 80 in Stuttgart. Those are floors, so the eight numbers do not add up to a German headcount. Adding lower bounds and calling the result a sum looks like math and means nothing.

All three sets of figures are self-declared. None of the three files an audited public account, so the 33.5k and the 14.4 billion stand on the firm's own word.

Big 3 against Big 4: the comparison this query asks for

The Big 4 are Deloitte, PwC, EY, and KPMG. They are audit networks with large consulting arms. Each one announces revenue every year, and that is the structural difference from a partnership.

Added together, the four announcements come to 224.4 billion dollars. The only public Big 3 revenue figure is 14.4 billion. Deloitte alone is about 5.2 times that, since 14.4 times 5 gives 72.0 and the remaining 2.5 billion is another 0.17 of it. The caveat travels with the number. Two of the three publish nothing, so this is one firm against four networks.

The work behind those revenues is mixed. PwC publishes advisory revenue of 24.3 billion dollars, which covers far more than strategy advice. Three of the four run a named strategy brand, Monitor Deloitte, Strategy&, and EY-Parthenon. Only EY publishes a figure for its strategy line, 6,235 million dollars, and it also covers deals and corporate finance.

One border between the two groups is legal rather than commercial. Federal rule 17 CFR 210.2-01 states that "An accountant is not independent if, at any point during the audit and professional engagement period, the accountant provides the following non-audit services to an audit client". Paragraph (c)(4) lists ten families: bookkeeping; design and implementation of financial information systems; appraisal, valuation and fairness opinions; actuarial services; internal audit outsourcing; management functions; human resources; broker-dealer, investment adviser and investment banking services; legal services; and expert services unrelated to the audit.

Two of the ten read directly onto consulting work. Management functions covers acting as a director, officer or employee of an audit client, and any "decision-making, supervisory, or ongoing monitoring function for the audit client." Expert services covers "Providing an expert opinion or other expert service for an audit client, or an audit client's legal representative, for the purpose of advocating an audit client's interests in litigation or in a regulatory or administrative proceeding or investigation." Litigation support is therefore work an auditor cannot sell to a company it audits, which is a structural reason for a separate economic consulting industry.

The limit matters as much as the rule. It binds an accountant with respect to an audit client. It says nothing about selling the same work to a company the network does not audit. A partnership with no audit arm carries none of this at all.

Acceptance rates nobody in the Big 3 publishes

None of the three firms publishes an acceptance rate. The figure under 1 percent circulates widely on this query with no source behind it, and we put no number on it in either direction.

What exists instead is a count of sponsored visa filings, published by the US Department of Labor and filed by the firms in one format. On fiscal 2026 the certified volumes read Boston Consulting Group 648, McKinsey 453, and Bain & Company 100, for a total of 1,201. A filing is a sponsorship case, so it is never a headcount and never a hire rate. It is useful because all three firms write in the same boxes.

The same filings carry entry salary bands, which is the most concrete published difference between the three at the point of hire.

One word changes rank between firms. Associate names the post-graduate level at McKinsey, with a floor of 192,000 dollars. At BCG it names the pre-graduate level, with a floor of 110,000. That is a gap of 82,000 dollars on the same job title. The filed McKinsey ladder carries no rank called Consultant, which is the post-graduate rank at both of the others. These bands cover base pay alone, and the consulting salary guide carries the fuller picture by firm.

The full firm map: MBB, Big 4, Tier 2, and boutiques

The three firms sit inside an industry that is readable tier by tier, and each tier has a document that makes it measurable.

Tier 2 is the hardest tier to measure, and one firm in it is readable because its parent is listed. Marsh & McLennan's annual report writes of Oliver Wyman that "It employs over 7,200 colleagues and generated approximately 13% of the Company's total revenue in 2025", and that "Consolidated revenue in 2025 was $27.0 billion". Thirteen percent of 27.0 billion gives 3.51 billion, so roughly 3.5 billion dollars. That product is ours from two published numbers. Kearney and Roland Berger publish no revenue at all.

The implementation tier is far larger than the Big 3 on every published measure. Accenture's annual report gives approximately 779,000 people and revenue of 69.7 billion dollars. It splits new bookings into consulting at 37.6 billion dollars and managed services at 43.0 billion, for the 80.6 billion total it reports. Dividing 43.0 by 80.6 gives 0.533, so about 53 percent of those bookings sit in running a client function rather than advising on it. Our page on IT consulting companies counts eight SEC industry codes across nineteen US-listed filers in that tier.

Economic consulting files the one operating figure no partnership publishes. CRA International employed "959 consultants" at 3 January 2026 and filed revenue of 751.6 million dollars for fiscal 2025, with utilization of "77%, 75%, and 70% for fiscal 2025, fiscal 2024, and fiscal 2023, respectively." The social sector tier is readable through tax filings, and nonprofit consulting firms and their filings opens nine of them. Boutique is the one word on this map with no published definition.

How the firm type changes the interview you sit

The tier decides what the selection process contains, and the firms publish it. One exercise prepared for every firm on this map is the wrong exercise somewhere.

At Bain, the published assessment stage runs through two vendors. Its hiring process page names "Sova or Test Gorilla" for the same stage, and states that "Applications will not be considered if the digital assessment is not completed". The two tools carry different rules. One of them can be split across sittings and the other runs in one pass.

At BCG, the US campus page times the stage precisely. The assessment arrives 30 to 90 minutes after the application, runs 30 to 35 minutes, and must be returned inside 48 hours, after which a selected group sits an online case of about 35 minutes.

In economic consulting the shape changes completely. Analysis Group's FAQ names no case interview at all. "The first-round interview will be behavior based and conducted virtually." For doctoral candidates it adds a stage borrowed from academic hiring, since "Ph.D. candidates are asked to present on their research with a job talk presentation." It routes by degree too. "If you have an undergraduate degree or a master's degree with no relevant work experience, you should apply for the analyst position." Its calendar runs from September to March.

The published stage lists by firm, the three in this title included, live on our page on the consulting interview process. One warning on reading them. A single firm often runs several processes by office and by region, so a stage list read for one country is evidence for that country.

How to choose between the three and the rest, in four steps

In order, because each step answers a question the tier label hides.

1. Look for a filing before you look at reputation. A listed firm files an annual report with headcount, revenue, and sometimes a utilization rate. An exempt organization files a Form 990 with fee income. A partnership files neither, so expect office-level detail and no financial statement.
2. Read the revenue or bookings split where one exists. One firm on this map has 5.4 billion dollars more in managed services bookings than in consulting bookings, and the larger half is the non-advisory one. Find out which half the role you want sits in before you accept it.
3. Read the firm's own recruiting page for the shape of the selection. One economic consultancy publishes a behavioral first round and a research presentation. Two of the Big 3 publish timed online assessments with different vendors and different rules. The tier predicts the exercise better than prestige does.
4. Check who the client is. A firm whose clients are law firms sells written analysis to a legal standard. A firm whose clients are chief executives sells a recommendation defended in a room. Both are consulting, and the daily work differs.

Run the four in that order and the answer comes from documents rather than from forum opinion. Step three is the one that cannot be skipped, because it decides what you practice this month.

What the drills cover before a Big 3 case interview

Our rubrics score the parts that every tier's exercise shares. The weights below are ours, set by us and read from our own code, and no firm publishes a scoring scheme of its own.

The math rubric weights Answer 40, Working 25, Units 15, and Interpretation 20. Working carries most in economic consulting, because written work to a legal standard is judged on whether someone else can redo it from your sheet.

The structure drill and the math drill both run in the browser with no account. How an answer is assessed sets out each weight with the reasoning behind it. Two things the drills leave alone. They simulate no research presentation and no coding exercise, and two tiers on this page publish exactly those stages. For those, the firm's own page is the material, and the four checks above say where to find it.

What no public document supports about these firms

Five claims this page leaves unmade, and the first is the one the query invites most.

No acceptance rate. None of the three firms publishes one. The visa filings count sponsorship cases and the recruiting pages count nothing, so no admission rate appears here.

No utilization rate for the partnerships. The one filed utilization figure on this page comes from a listed firm in a different tier. McKinsey, BCG, and Bain file no annual report and publish no such rate.

No revenue or headcount for two of the three. McKinsey and Bain publish neither on the pages read for this guide, and we do not reconstruct either from office-level floors or from third-party estimates.

No culture comparison. The three firms publish nothing comparable on culture, and their own pages say it varies by office and team. We have not measured it, so this page says nothing about it.

No definition of boutique, and no threshold between a boutique and a niche firm. Nobody publishes either. The term describes an impression on this query, and no number is attached to it here.

Two absences are ours rather than the industry's. The federal labor statistics page for management analysts returned 403 to two sets of headers, so no employment figure for the trade appears here. And the three firms' own domains refused direct requests again on 8 October 2026, which is why the figures above carry the reading dates in the source list rather than today's.

What changed on this Big 3 page, and when

8 October 2026. The page was retitled and rebuilt around the three firms. The old title announced five categories proven by documents, and the page opened on our own rule for admitting a category. That put our reading method in front of the reader's question.

Gone: the opening rule, the method framing, and the count in the title. Kept: the two annual reports, the federal independence rule with its barred families and its audit-client limit, the Form 990 tier, the published selection shapes, and the four checks. Added: the three firms in the first sentence, their founding years with the page each comes from, what each publishes about its size, the Big 4 comparison, the entry bands filed with the Department of Labor, and the absence of any published acceptance rate.

1 October 2026. This replaced a 231-word page that listed four categories, each described in two sentences with no source behind any of them. Removed then: the claim that strategy work is delivered in weeks with small teams, the claim that the recommendation matters less at an implementation firm than whether it can be built, and the claim that economic consulting is written rather than presentational. The first two were market facts passing for findings. The third survives in another form, because one firm's filing and its own careers page support both the client type and the hourly billing model.