Company lists · Data refreshed September 2026

Top 25 Tier one consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 36,546 companies tracked

RevenueBase identified 36,546 tier one consulting firms worldwide as of September 2026 and tracks 766,598 professional contacts across them, including 264,876 with verified work emails. The United States is the largest market and London the largest hub.

This list covers tier one 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 29, 2026. Country and city lists for tier one 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 29, 2026 86% judged on-target in blind review

36,546Companies

766,598Contacts tracked

264,876Verified emails

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The 25 largest tier one consulting firms worldwide

Ranked by team size

Top 25 of 36,546 tier one consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to tier one 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	Mckinsey & Company	Partial evidence	United StatesHQ checked Sep 29, 2026	10001+	50,427 contacts →
	Partial evidence “McKinsey & Company is a global management consulting firm.” Source: RevenueBase Database · checked Sep 29, 2026
2	EXL	Indirect evidence	New York, NY, United StatesHQ checked Sep 29, 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 29, 2026
3	Boston Consulting Group BCG	Partial evidence	Boston, MA, United StatesHQ checked Sep 29, 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 29, 2026
4	Sopra Steria	Partial evidence	Paris, FranceHQ checked Sep 29, 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 29, 2026
5	ZS	Partial evidence	Evanston, IL, United StatesHQ checked Sep 29, 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 29, 2026
6	Capgemini Invent	Partial evidence	Paris, FranceHQ checked Sep 29, 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 29, 2026
7	Korn Ferry	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 29, 2026	10001+	13,486 contacts →
	Partial evidence “Korn Ferry is a global consulting firm that powers performance.” Source: RevenueBase Database · checked Sep 29, 2026
8	Alvarez & Marsal	Indirect evidence	New York, NY, United StatesHQ checked Sep 29, 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 29, 2026
9	Slalom	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 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 29, 2026
10	Accenture Brasil	Indirect evidence	São Paulo, BrazilHQ checked Sep 29, 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 29, 2026
11	Protiviti	Partial evidence	Menlo Park, CA, United StatesHQ checked Sep 29, 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 29, 2026
12	Oliver Wyman	Indirect evidence	New York, NY, United StatesHQ checked Sep 29, 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 29, 2026
13	Yash Technologies	Partial evidence	East Moline, IL, United StatesHQ checked Sep 29, 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 29, 2026
14	HURON	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 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 29, 2026
15	Kearney	Strong evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	5,001-10,000	6,978 contacts →
	Strong 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 29, 2026
16	Wavestone	Partial evidence	100-101 Terrasse Boieldieu, FranceHQ checked Sep 29, 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 29, 2026
17	Management Solutions	Partial evidence	Madrid, SpainHQ checked Sep 29, 2026	1,001-5,000	4,468 contacts →
	Partial evidence “Management Solutions is a leading provider of business consulting services for regulated industries.” Source: RevenueBase Database · checked Sep 29, 2026
18	L.E.K. Consulting	Indirect evidence	Boston, MA, United StatesHQ checked Sep 29, 2026	1,001-5,000	4,093 contacts →
	Indirect evidence “L.E.K.” Source: RevenueBase Database · checked Sep 29, 2026
19	DAI	Partial evidence	Bethesda, MD, United StatesHQ checked Sep 29, 2026	5,001-10,000	3,741 contacts →
	Partial evidence “DAI is an integrated professional services and advisory firm that provides project design and delivery, management consulting, and financial services to companies, investors, and…” Source: RevenueBase Database · checked Sep 29, 2026
20	Accenture Dach	Indirect evidence	Kronberg Im Taunus, GermanyHQ checked Sep 29, 2026	10001+	3,644 contacts →
	Indirect evidence “Über Accenture: Wir sind die weltweit führenden Berater für Strategie, Management, Digitalisierung, Technologie, Outsourcing und Business Transformation.” Source: RevenueBase Database · checked Sep 29, 2026
21	Alixpartners	Indirect evidence	New York, NY, United StatesHQ checked Sep 29, 2026	1,001-5,000	3,583 contacts →
	Indirect evidence “For more than forty years, AlixPartners has helped businesses around the world respond quickly and decisively to their most critical challenges – circumstances as diverse as…” Source: RevenueBase Database · checked Sep 29, 2026
22	Withum	Indirect evidence	Princeton, NJ, United StatesHQ checked Sep 29, 2026	1,001-5,000	3,326 contacts →
	Indirect evidence “Withum is a forward-thinking, technology-driven advisory and accounting firm, helping clients to Be in a Position of Strength in today’s modern business landscape.” Source: RevenueBase Database · checked Sep 29, 2026
23	ETEAM	Indirect evidence	Somerset, NJ, United StatesHQ checked Sep 29, 2026	n/a	3,285 contacts →
	Indirect evidence “For over 25 years, eTeam has been trusted by global organizations to lead high-stakes programs where execution matters as much as strategy.” Source: RevenueBase Database · checked Sep 29, 2026
24	Monitor Deloitte	Indirect evidence	United StatesHQ checked Sep 29, 2026	5,001-10,000	3,116 contacts →
	Indirect evidence “To navigate the future with confidence, organizations need to make and act upon the right choices: clear, timely and inspirational choices that deliver growth in a dynamic…” Source: RevenueBase Database · checked Sep 29, 2026
25	Armanino	Indirect evidence	San Ramon, CA, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,989 contacts →
	Indirect evidence “Founded as an alternative to the status quo, Armanino doesn’t just keep up with change, we embrace it.” Source: RevenueBase Database · checked Sep 29, 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: tier one 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 tier one consulting firms.
Partial evidence: Its own public description names part of tier one consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name tier one 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 36,546 tier one consulting firms worldwide

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Tier one consulting firms worldwide at a glance

As of Sep 29, 2026

34.6%Verified-email coverage

21.0Average contacts per company

1-10Median size (employees)

2.5%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

24,250

11-50

8,627

51-200

2,436

201-500

593

501-1,000

225

1,001-5,000

199

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 tier one 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: Every country. Country and city lists for tier one consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “tier one 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 tier one 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 tier one 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, 264,876 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 29, 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.

Tier one consulting firms by location

173 lists · largest first

Every Tier one 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 tier one 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 tier one consulting firms are there worldwide?

RevenueBase identified 36,546 tier one 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?

Mckinsey & Company, headquartered in Worldwide, tops this list with the largest team on record.

Which country has the most tier one consulting firms?

The United States leads with 7,780 companies, followed by the United Kingdom (2,450) and France (2,043). Every tier one consulting firms list by country and city is linked on this page.

Which city has the most tier one consulting firms?

London leads with 931 headquartered companies, followed by Paris (678) and Sao Paulo (433).

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 264,876 verified decision-maker contacts tracked across these 36,546 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 29, 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.