Company lists · Data refreshed September 2026

Top 25 Big 5 consulting firms worldwide

Name: Big 5 consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 38,489 companies tracked

RevenueBase identified 38,489 big 5 consulting firms worldwide as of September 2026 and tracks 887,362 professional contacts across them, including 340,713 with verified work emails and 136,836 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers big 5 consulting 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 23, 2026. Country and city lists for big 5 consulting 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 23, 2026 86% judged on-target in blind review

38,489Companies

887,362Contacts tracked

340,713Verified emails

136,836Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest big 5 consulting firms worldwide

Ranked by team size

Top 25 of 38,489 big 5 consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to big 5 consulting 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	EXL	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	10001+	40,100 contacts →
	Indirect evidence “Choosing a digital partner is about more than capabilities, it’s about collaboration and character.” Source: RevenueBase Database · checked Sep 23, 2026
2	Boston Consulting Group BCG	Partial evidence	Boston, MA, United StatesHQ checked Sep 23, 2026	10001+	38,730 contacts →
	Partial 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 23, 2026
3	Sopra Steria	Partial evidence	Paris, FranceHQ checked Sep 23, 2026	10001+	36,960 contacts →
	Partial evidence “Sopra Steria, a major Tech player in Europe with employees in nearly 30 countries, is recognised for its consulting, digital services and solutions.” Source: RevenueBase Database · checked Sep 23, 2026
4	Teksystems	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 23, 2026	10001+	24,693 contacts →
	Indirect evidence “We’re TEKsystems and TEKsystems Global Services.” Source: RevenueBase Database · checked Sep 23, 2026
5	Bain & Company	Indirect evidence	Boston, MA, United StatesHQ checked Sep 23, 2026	10001+	21,689 contacts →
	Indirect evidence “Bain & Company is a global consultancy that helps the world’s most ambitious change makers define the future.” Source: RevenueBase Database · checked Sep 23, 2026
6	Ey-Parthenon	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	10001+	17,070 contacts →
	Indirect evidence “Our unique combination of transformative strategy, transactions and corporate finance delivers real-world value – solutions that work in practice, not just on paper.” Source: RevenueBase Database · checked Sep 23, 2026
7	ZS	Partial evidence	Evanston, IL, United StatesHQ checked Sep 23, 2026	10001+	16,896 contacts →
	Partial evidence “ZS is a management consulting and technology firm that partners with companies to improve life and how we live it.” Source: RevenueBase Database · checked Sep 23, 2026
8	Capgemini Invent	Partial evidence	Paris, FranceHQ checked Sep 23, 2026	10001+	16,032 contacts →
	Partial evidence “Capgemini Invent is the digital innovation, consulting and transformation brand of the Capgemini Group, a global business line that combines market leading expertise in strategy…” Source: RevenueBase Database · checked Sep 23, 2026
9	Korn Ferry	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 23, 2026	10001+	13,486 contacts →
	Partial evidence “Korn Ferry is a global consulting firm that powers performance.” Source: RevenueBase Database · checked Sep 23, 2026
10	Alvarez & Marsal	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	10001+	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 23, 2026
11	Guidehouse	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 23, 2026	10001+	12,815 contacts →
	Indirect evidence “Guidehouse is a global AI-led professional services firm delivering advisory, technology, and managed services to the commercial and government sectors.” Source: RevenueBase Database · checked Sep 23, 2026
12	Slalom	Partial evidence	Seattle, WA, United StatesHQ checked Sep 23, 2026	10001+	10,032 contacts →
	Partial evidence “Slalom is a fiercely human business and technology consulting company that leads with outcomes to bring more value, in all ways, always.” Source: RevenueBase Database · checked Sep 23, 2026
13	Accenture Brasil	Indirect evidence	São Paulo, BrazilHQ checked Sep 23, 2026	10001+	9,830 contacts →
	Indirect evidence “A Accenture é uma empresa líder global de serviços profissionais que ajuda grandes companhias, governos e outras organizações a construir sua essência digital, otimizar suas…” Source: RevenueBase Database · checked Sep 23, 2026
14	Protiviti	Partial evidence	Menlo Park, CA, United StatesHQ checked Sep 23, 2026	5,001-10,000	8,779 contacts →
	Partial 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 23, 2026
15	Oliver Wyman	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	5,001-10,000	8,230 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 23, 2026
16	Bearingpoint	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 23, 2026	5,001-10,000	8,106 contacts →
	Indirect evidence “BearingPoint is an independent management and technology consultancy.” Source: RevenueBase Database · checked Sep 23, 2026
17	Yash Technologies	Partial evidence	East Moline, IL, United StatesHQ checked Sep 23, 2026	5,001-10,000	7,769 contacts →
	Partial evidence “YASH Technologies is a consulting-led transformation partner with a proven track record of helping customers address their current and prospective digital transformation…” Source: RevenueBase Database · checked Sep 23, 2026
18	HURON	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 23, 2026	5,001-10,000	7,520 contacts →
	Indirect evidence “Huron is a global professional services firm that collaborates with organizations to solve complex challenges and achieve ambitious goals.” Source: RevenueBase Database · checked Sep 23, 2026
19	Kearney	Partial evidence	Chicago, IL, United StatesHQ checked Sep 23, 2026	5,001-10,000	6,978 contacts →
	Partial 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 23, 2026
20	Accenture Argentina	Indirect evidence	Parque Patricios, ArgentinaHQ checked Sep 23, 2026	10001+	6,620 contacts →
	Indirect evidence “Accenture ayuda a las empresas líderes del mundo a reinventarse, construyendo su núcleo digital y liberando el poder de la IA para crear valor con rapidez en organizaciones de…” Source: RevenueBase Database · checked Sep 23, 2026
21	Wavestone	Partial evidence	100-101 Terrasse Boieldieu, FranceHQ checked Sep 23, 2026	1,001-5,000	6,190 contacts →
	Partial evidence “Wavestone is a leading consulting firm operating at the intersection of business and technology.” Source: RevenueBase Database · checked Sep 23, 2026
22	PA Consulting	Indirect evidence	London, United StatesHQ checked Sep 23, 2026	1,001-5,000	4,950 contacts →
	Indirect evidence “We believe in the power of ingenuity to build a positive human future.” Source: RevenueBase Database · checked Sep 23, 2026
23	Groupe SII	Indirect evidence	Paris, FranceHQ checked Sep 23, 2026	10001+	4,928 contacts →
	Indirect evidence “Le groupe SII est une société d’ingénierie et de conseil en technologies (ICT) et une entreprise de services numériques (ESN) créée en 1979 par Bernard HUVÉ, ingénieur de…” Source: RevenueBase Database · checked Sep 23, 2026
24	Amaris Consulting	Partial evidence	Chêne-bourg, SwitzerlandHQ checked Sep 23, 2026	5,001-10,000	4,824 contacts →
	Partial evidence “Amaris Consulting is an independent technology consulting firm providing guidance and solutions to businesses.” Source: RevenueBase Database · checked Sep 23, 2026
25	Roland Berger	Indirect evidence	Munich, GermanyHQ checked Sep 23, 2026	1,001-5,000	4,632 contacts →
	Indirect evidence “Roland Berger is the only leading global strategy consultancy of European origin.” Source: RevenueBase Database · checked Sep 23, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: big 5 consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names big 5 consulting firms.
Partial evidence: Its own public description names part of big 5 consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name big 5 consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 38,489 big 5 consulting firms worldwide

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 340,713 reachable decision-makers.

Free signup · no credit card

View the full list →

Big 5 consulting firms worldwide at a glance

As of Sep 23, 2026

38.4%Verified-email coverage

15.4%Mobile-number coverage

23.1Average contacts per company

1-10Median size (employees)

3.7%Largest-city concentration · London

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

26,578

11-50

8,277

51-200

2,439

201-500

577

501-1,000

228

1,001-5,000

189

5,001-10,000

10001+

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 big 5 consulting 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: 35 countries, largest first: the United States, the United Kingdom, France, Brazil, Germany, Canada, Australia, Spain, Italy, Mexico and 25 more. Country and city lists for big 5 consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “big 5 consulting 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 big 5 consulting 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 big 5 consulting 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, 340,713 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 23, 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.

Big 5 consulting firms by location

180 lists · largest first

Every Big 5 consulting 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 big 5 consulting 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 big 5 consulting firms are there worldwide?

RevenueBase identified 38,489 big 5 consulting 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?

EXL, headquartered in New York, tops this list with the largest team on record.

Which country has the most big 5 consulting firms?

The United States leads with 13,047 companies, followed by the United Kingdom (3,656) and France (3,116). Every big 5 consulting firms list by country and city is linked on this page.

Which city has the most big 5 consulting firms?

London leads with 1429 headquartered companies, followed by Paris (1036) and Sao Paulo (812).

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 340,713 verified decision-maker contacts tracked across these 38,489 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 23, 2026.

Ready to reach these companies? Verified emails and direct dials for all 38,489 big 5 consulting firms worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.