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Company lists · Data refreshed September 2026

Top 25 Consultancy firms worldwide

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 175,821 companies tracked

RevenueBase identified 175,821 consultancy firms worldwide as of September 2026 and tracks 1,684,342 professional contacts across them, including 532,124 with verified work emails and 180,386 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers consultancy firms worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 24, 2026. Country and city lists for consultancy firms follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 24, 2026 86% judged on-target in blind review
175,821Companies
1,684,342Contacts tracked
532,124Verified emails
180,386Mobile numbers
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The 25 largest consultancy firms worldwide

Ranked by team size
Top 25 of 175,821 consultancy firms worldwide, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to consultancy firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1
Boston Consulting Group BCG
Indirect evidenceBoston, MA, United StatesHQ checked Sep 24, 202610001+38,730 contacts →

Indirect evidence

“Boston Consulting Group partners with leaders in business and society to tackle their most important challenges and capture their greatest opportunities.”

Source: RevenueBase Database · checked Sep 24, 2026
2
Autonomo
Indirect evidenceCórdoba, SpainHQ checked Sep 24, 2026n/a23,018 contacts →

Indirect evidence

“Calidad y Gestión es una empresa consultora de ámbito internacional especializada en servicios de asesoría en las siguientes áreas: Calidad Medio Ambiente Responsabilidad social…”

Source: RevenueBase Database · checked Sep 24, 2026
3
Bain & Company
Strong evidenceBoston, MA, United StatesHQ checked Sep 24, 202610001+21,689 contacts →

Strong evidence

“Bain & Company is a global consultancy that helps the world’s most ambitious change makers define the future.”

Source: RevenueBase Database · checked Sep 24, 2026
4
Korn Ferry
Indirect evidenceLos Angeles, CA, United StatesHQ checked Sep 24, 202610001+13,486 contacts →

Indirect evidence

“Korn Ferry is a global consulting firm that powers performance.”

Source: RevenueBase Database · checked Sep 24, 2026
5
Alvarez & Marsal
Indirect evidenceNew York, NY, United StatesHQ checked Sep 24, 202610001+13,099 contacts →

Indirect evidence

“Alvarez & Marsal is a leading global professional services firm dedicated to helping organizations tackle their most complex business issues, maximize stakeholder value, and…”

Source: RevenueBase Database · checked Sep 24, 2026
6
Idol Image Consulting
Indirect evidenceKula, HI, TürkiyeHQ checked Sep 24, 2026n/a12,976 contacts →

Indirect evidence

“IDOL Image Consulting has developed strategies to help individuals, groups or corporate organizations face today’s challenges and fierce competition.”

Source: RevenueBase Database · checked Sep 24, 2026
7
Protiviti
Indirect evidenceMenlo Park, CA, United StatesHQ checked Sep 24, 20265,001-10,0008,779 contacts →

Indirect evidence

“Protiviti is a global consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently face the…”

Source: RevenueBase Database · checked Sep 24, 2026
8
MACE
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 20265,001-10,0008,458 contacts →

Indirect evidence

“Mace Consult launched as a new and independent business on 5 March 2026, through a carve-out from Mace Group.”

Source: RevenueBase Database · checked Sep 24, 2026
9
Oliver Wyman
Indirect evidenceNew York, NY, United StatesHQ checked Sep 24, 20265,001-10,0008,230 contacts →

Indirect evidence

“At Oliver Wyman, a Marsh business, we bring deep industry insight, bold innovation, and a collaborative approach that cuts through complexity to help organizations navigate their…”

Source: RevenueBase Database · checked Sep 24, 2026
10
Bearingpoint
Strong evidenceAmsterdam, NetherlandsHQ checked Sep 24, 20265,001-10,0008,106 contacts →

Strong evidence

“BearingPoint is an independent management and technology consultancy.”

Source: RevenueBase Database · checked Sep 24, 2026
11
Deloitte Digital
Indirect evidenceUsa, FranceHQ checked Sep 24, 202610001+7,716 contacts →

Indirect evidence

“At Deloitte Digital, we connect brands with the right strategies and tools to create great impact.”

Source: RevenueBase Database · checked Sep 24, 2026
12
Kearney
Indirect evidenceChicago, IL, United StatesHQ checked Sep 24, 20265,001-10,0006,978 contacts →

Indirect evidence

“As one of the original firms, we’ve never lost sight of the fact that consulting is a people business.”

Source: RevenueBase Database · checked Sep 24, 2026
13
CBIZ
Indirect evidenceIndependence, OH, United StatesHQ checked Sep 24, 202610001+6,369 contacts →

Indirect evidence

“CBIZ, Inc.(NYSE: CBZ) is a leading professional services advisor to middle-market businesses nationwide.”

Source: RevenueBase Database · checked Sep 24, 2026
14
Wavestone
Indirect evidence100-101 Terrasse Boieldieu, FranceHQ checked Sep 24, 20261,001-5,0006,190 contacts →

Indirect evidence

“Wavestone is a leading consulting firm operating at the intersection of business and technology.”

Source: RevenueBase Database · checked Sep 24, 2026
15
Kpmg France
Indirect evidenceParis La Défense, FranceHQ checked Sep 24, 202610001+5,839 contacts →

Indirect evidence

“Leader de l'audit, du conseil et de l'expertise comptable, KPMG France est membre de KPMG International, réseau de cabinets indépendants exerçant dans 155 pays.”

Source: RevenueBase Database · checked Sep 24, 2026
16
AZETS
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 20265,001-10,0005,632 contacts →

Indirect evidence

“Azets is an international business advisory group, with local experts in 190 locations across eight countries, backed by progressive technology.”

Source: RevenueBase Database · checked Sep 24, 2026
17
Kpmg España
Indirect evidenceMadrid, SpainHQ checked Sep 24, 20265,001-10,0005,114 contacts →

Indirect evidence

“KPMG en España es una firma de servicios profesionales que ofrece servicios de auditoría, fiscales y de asesoramiento legal, financiero y de negocio con más de 2.700 profesionales…”

Source: RevenueBase Database · checked Sep 24, 2026
18
Amaris Consulting
Indirect evidenceChêne-bourg, SwitzerlandHQ checked Sep 24, 20265,001-10,0004,824 contacts →

Indirect evidence

“Amaris Consulting is an independent technology consulting firm providing guidance and solutions to businesses.”

Source: RevenueBase Database · checked Sep 24, 2026
19
Roland Berger
Strong evidenceMunich, GermanyHQ checked Sep 24, 20261,001-5,0004,632 contacts →

Strong evidence

“Roland Berger is the only leading global strategy consultancy of European origin.”

Source: RevenueBase Database · checked Sep 24, 2026
20
BIP
Indirect evidenceMilano, ItalyHQ checked Sep 24, 20265,001-10,0004,548 contacts →

Indirect evidence

“A network of thinkers, creatives and creators.”

Source: RevenueBase Database · checked Sep 24, 2026
21
Management Solutions
Indirect evidenceMadrid, SpainHQ checked Sep 24, 20261,001-5,0004,468 contacts →

Indirect evidence

“Management Solutions is a leading provider of business consulting services for regulated industries.”

Source: RevenueBase Database · checked Sep 24, 2026
22
BECA
Indirect evidenceAuckland, New ZealandHQ checked Sep 24, 20261,001-5,0004,268 contacts →

Indirect evidence

“Creative people together transforming the world is our vision.”

Source: RevenueBase Database · checked Sep 24, 2026
23
Eisneramper
Indirect evidenceNew York, NY, United StatesHQ checked Sep 24, 20261,001-5,0004,199 contacts →

Indirect evidence

“EisnerAmper, one of the largest business consulting firms in the world, is comprised of EisnerAmper LLP, a licensed independent CPA firm that provides client attest services; and…”

Source: RevenueBase Database · checked Sep 24, 2026
24
L.E.K. Consulting
Indirect evidenceBoston, MA, United StatesHQ checked Sep 24, 20261,001-5,0004,093 contacts →

Indirect evidence

“L.E.K.”

Source: RevenueBase Database · checked Sep 24, 2026
25
SX Negócios
Indirect evidenceNovo Hamburgo, BrazilHQ checked Sep 24, 20265,001-10,0004,020 contacts →

Indirect evidence

“Somos a Pulse Client Experts, uma empresa em constante evolução, impulsionados pela vontade de fazer acontecer.”

Source: RevenueBase Database · checked Sep 24, 2026

Showing 25 of 175,821 consultancy firms worldwide

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Consultancy firms worldwide at a glance

As of Sep 24, 2026
31.6%Verified-email coverage
10.7%Mobile-number coverage
9.6Average contacts per company
1-10Median size (employees)
4.4%Largest-city concentration · London
Sep 24, 2026Page data refreshed

Companies by employee count

1-10
133,323
11-50
33,370
51-200
6,627
201-500
1,319
501-1,000
455
1,001-5,000
343
5,001-10,000
76
10001+
88

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among consultancy firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage
47 countries, largest first: the United States, the United Kingdom, Brazil, France, Germany, Italy, Spain, the Netherlands, Australia, Canada and 37 more. Country and city lists for consultancy firms are linked below.
What qualifies
Companies worldwide whose own description of what they do matches “consultancy firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search
RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names consultancy firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude
Companies whose own description does not clearly place them among consultancy firms, and records with no verified work email.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking
Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification
Every listed company carries at least one verified work email, 532,124 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh
This page's figures were pulled from the company graph on September 24, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Consultancy firms by location

615 lists · largest first

Every Consultancy firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names consultancy firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many consultancy firms are there worldwide?

RevenueBase identified 175,821 consultancy firms worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Boston Consulting Group BCG, headquartered in Boston, tops this list with the largest team on record.

Which country has the most consultancy firms?

The United States leads with 32,029 companies, followed by the United Kingdom (21,294) and Brazil (19,107). Every consultancy firms list by country and city is linked on this page.

Which city has the most consultancy firms?

London leads with 7778 headquartered companies, followed by Sao Paulo (5064) and Paris (4352).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 532,124 verified decision-maker contacts tracked across these 175,821 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 24, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.

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