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 company matches for 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 company matches for tier one consulting firms worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. 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 SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 29, 2026 How this list was built

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 company matches for tier one consulting firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 29, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Mckinsey & Company	Exact match	United StatesHQ recorded Sep 29, 2026	10001+	50,427 contacts →
	Exact match “McKinsey & Company is a global management consulting firm.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
2	EXL	Exact match	New York, NY, United StatesHQ recorded Sep 29, 2026	10001+	40,100 contacts →
	Exact match “Choosing a digital partner is about more than capabilities, it’s about collaboration and character.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
3	Boston Consulting Group BCG	Exact match	Boston, MA, United StatesHQ recorded Sep 29, 2026	10001+	38,730 contacts →
	Exact match “Boston Consulting Group partners with leaders in business and society to tackle their most important challenges and capture their greatest opportunities.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
4	Sopra Steria	Exact match	Paris, FranceHQ recorded Sep 29, 2026	10001+	36,960 contacts →
	Exact match “Sopra Steria, a major Tech player in Europe with employees in nearly 30 countries, is recognised for its consulting, digital services and solutions.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
5	ZS	Exact match	Evanston, IL, United StatesHQ recorded Sep 29, 2026	10001+	16,896 contacts →
	Exact match “ZS is a management consulting and technology firm that partners with companies to improve life and how we live it.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
6	Capgemini Invent	Exact match	Paris, FranceHQ recorded Sep 29, 2026	10001+	16,032 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
7	Korn Ferry	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 29, 2026	10001+	13,486 contacts →
	Exact match “Korn Ferry is a global consulting firm that powers performance.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
8	Alvarez & Marsal	Exact match	New York, NY, United StatesHQ recorded Sep 29, 2026	10001+	13,099 contacts →
	Exact match “Alvarez & Marsal is a leading global professional services firm dedicated to helping organizations tackle their most complex business issues, maximize stakeholder value, and…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
9	Slalom	Exact match	Seattle, WA, United StatesHQ recorded Sep 29, 2026	10001+	10,032 contacts →
	Exact match “Slalom is a fiercely human business and technology consulting company that leads with outcomes to bring more value, in all ways, always.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
10	Accenture Brasil	Exact match	São Paulo, BrazilHQ recorded Sep 29, 2026	10001+	9,830 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
11	Protiviti	Exact match	Menlo Park, CA, United StatesHQ recorded Sep 29, 2026	5,001-10,000	8,779 contacts →
	Exact match “Protiviti is a global consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently face the…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
12	Oliver Wyman	Exact match	New York, NY, United StatesHQ recorded Sep 29, 2026	5,001-10,000	8,230 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
13	Yash Technologies	Exact match	East Moline, IL, United StatesHQ recorded Sep 29, 2026	5,001-10,000	7,769 contacts →
	Exact match “YASH Technologies is a consulting-led transformation partner with a proven track record of helping customers address their current and prospective digital transformation…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
14	HURON	Exact match	Chicago, IL, United StatesHQ recorded Sep 29, 2026	5,001-10,000	7,520 contacts →
	Exact match “Huron is a global professional services firm that collaborates with organizations to solve complex challenges and achieve ambitious goals.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
15	Kearney	Exact match	Chicago, IL, United StatesHQ recorded Sep 29, 2026	5,001-10,000	6,978 contacts →
	Exact match “As one of the original firms, we’ve never lost sight of the fact that consulting is a people business.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
16	Wavestone	Exact match	100-101 Terrasse Boieldieu, FranceHQ recorded Sep 29, 2026	1,001-5,000	6,190 contacts →
	Exact match “Wavestone is a leading consulting firm operating at the intersection of business and technology.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
17	Management Solutions	Exact match	Madrid, SpainHQ recorded Sep 29, 2026	1,001-5,000	4,468 contacts →
	Exact match “Management Solutions is a leading provider of business consulting services for regulated industries.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
18	L.E.K. Consulting	Exact match	Boston, MA, United StatesHQ recorded Sep 29, 2026	1,001-5,000	4,093 contacts →
	Exact match “L.E.K.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
19	DAI	Exact match	Bethesda, MD, United StatesHQ recorded Sep 29, 2026	5,001-10,000	3,741 contacts →
	Exact match “DAI is an integrated professional services and advisory firm that provides project design and delivery, management consulting, and financial services to companies, investors, and…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
20	Accenture Dach	Exact match	Kronberg Im Taunus, GermanyHQ recorded Sep 29, 2026	10001+	3,644 contacts →
	Exact match “Über Accenture: Wir sind die weltweit führenden Berater für Strategie, Management, Digitalisierung, Technologie, Outsourcing und Business Transformation.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
21	Alixpartners	Exact match	New York, NY, United StatesHQ recorded Sep 29, 2026	1,001-5,000	3,583 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
22	Withum	Exact match	Princeton, NJ, United StatesHQ recorded Sep 29, 2026	1,001-5,000	3,326 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
23	ETEAM	Exact match	Somerset, NJ, United StatesHQ recorded Sep 29, 2026	n/a	3,285 contacts →
	Exact match “For over 25 years, eTeam has been trusted by global organizations to lead high-stakes programs where execution matters as much as strategy.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
24	Monitor Deloitte	Exact match	United StatesHQ recorded Sep 29, 2026	5,001-10,000	3,116 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
25	Armanino	Exact match	San Ramon, CA, United StatesHQ recorded Sep 29, 2026	1,001-5,000	2,989 contacts →
	Exact match “Founded as an alternative to the status quo, Armanino doesn’t just keep up with change, we embrace it.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “tier one consulting firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

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

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, 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: Company records worldwide whose business descriptions match “tier one consulting firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 264,876 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Tier one consulting firms by location

174 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 SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “tier one consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many tier one consulting firms are there worldwide?

RevenueBase identified 36,546 company matches for tier one consulting firms worldwide as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Mckinsey & Company tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

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 company records, 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 limited free results with 500 credits to start. Upgrading provides access to the 264,876 professional contacts with verified work emails tracked across these 36,546 companies; direct dials are available where recorded.

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 SmartSearch, 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.