Company lists · Data refreshed September 2026

Top 25 Business advisory and consulting firms worldwide

Name: Business advisory and consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 121,717 companies tracked

RevenueBase identified 121,717 business advisory and consulting firms worldwide as of September 2026 and tracks 1,097,419 professional contacts across them, including 392,412 with verified work emails and 176,662 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers business advisory and 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 business advisory and 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

121,717Companies

1,097,419Contacts tracked

392,412Verified emails

176,662Mobile numbers

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The 25 largest business advisory and consulting firms worldwide

Ranked by team size

Top 25 of 121,717 business advisory and 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 business advisory and 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	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
2	Deloitte Digital	Indirect evidence	Usa, FranceHQ checked Sep 23, 2026	10001+	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 23, 2026
3	AZETS	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	5,001-10,000	5,632 contacts →
	Partial 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 23, 2026
4	Kpmg España	Indirect evidence	Madrid, SpainHQ checked Sep 23, 2026	5,001-10,000	5,114 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 23, 2026
5	Management Solutions	Partial evidence	Madrid, SpainHQ checked Sep 23, 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 23, 2026
6	PWC Luxembourg	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	1,001-5,000	3,413 contacts →
	Indirect evidence “PwC Luxembourg is the largest professional services firm in Luxembourg with over 3,600 people employed from 90 different countries.” Source: RevenueBase Database · checked Sep 23, 2026
7	In Extenso	Indirect evidence	Lyon, FranceHQ checked Sep 23, 2026	5,001-10,000	3,278 contacts →
	Indirect evidence “Crée en 1991 In Extenso est l’un des leaders de l’expertise comptable en France.” Source: RevenueBase Database · checked Sep 23, 2026
8	Kpmg Ireland	Partial evidence	Dublin 2, IrelandHQ checked Sep 23, 2026	1,001-5,000	2,952 contacts →
	Partial evidence “KPMG is a leading provider of professional services, offering a range of audit, tax and advisory services to a broad range of domestic and international clients across all sectors…” Source: RevenueBase Database · checked Sep 23, 2026
9	Simon-Kucher	Indirect evidence	Bonn, GermanyHQ checked Sep 23, 2026	1,001-5,000	2,873 contacts →
	Indirect evidence “Simon-Kucher is a global consultancy with more than 2,200 employees in 30+ countries.” Source: RevenueBase Database · checked Sep 23, 2026
10	Minterellison	Partial evidence	AustraliaHQ checked Sep 23, 2026	1,001-5,000	2,667 contacts →
	Partial evidence “MinterEllison is one of Australia’s largest independent law and consulting firms.” Source: RevenueBase Database · checked Sep 23, 2026
11	Grant Thornton Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 23, 2026	1,001-5,000	2,374 contacts →
	Indirect evidence “In Ireland, Grant Thornton Ireland and Grant Thornton Corporate Finance Limited (and their respective subsidiary/affiliate entities) operate under an alternative practice…” Source: RevenueBase Database · checked Sep 23, 2026
12	Arthur D. Little	Indirect evidence	Brussels, BelgiumHQ checked Sep 23, 2026	1,001-5,000	2,186 contacts →
	Indirect evidence “As people, organizations and societies embrace change at pace, its leaders must anticipate, innovate and transform ever faster.” Source: RevenueBase Database · checked Sep 23, 2026
13	Baringa	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	2,179 contacts →
	Partial evidence “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Source: RevenueBase Database · checked Sep 23, 2026
14	S&w	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,930 contacts →
	Partial evidence “As a fast growing UK accounting and advisory firm, we’ve been there, as a trusted partner, helping businesses and individuals meet challenges and seize opportunities across…” Source: RevenueBase Database · checked Sep 23, 2026
15	W1 Consultoria	Indirect evidence	São Paulo, BrazilHQ checked Sep 23, 2026	501-1,000	1,915 contacts →
	Indirect evidence “Juntos, em todas as suas conquistas Com um modelo de negócios com mais de 40 anos de sucesso na Europa, a W1 é pioneira no mercado de consultoria financeira no Brasil.” Source: RevenueBase Database · checked Sep 23, 2026
16	TLT LLP	Indirect evidence	Bristol, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,797 contacts →
	Indirect evidence “We’re your business advisers as well as your lawyers, working in step with you to protect your interests today and progress your ambitions for tomorrow.” Source: RevenueBase Database · checked Sep 23, 2026
17	BDO Brazil	Indirect evidence	Sp, BrazilHQ checked Sep 23, 2026	1,001-5,000	1,791 contacts →
	Indirect evidence “Presidida por Raul Corrêa da Silva, a BDO RCS foi fundada em 2001 e desde então mantém participação expressiva no mercado de auditorias.” Source: RevenueBase Database · checked Sep 23, 2026
18	Grant Thornton Sweden	Indirect evidence	Stockholm, SwedenHQ checked Sep 23, 2026	1,001-5,000	1,724 contacts →
	Indirect evidence “Grant Thornton är ett ledande revisions- och rådgivningsföretag med över 1400 medarbetare som erbjuder tjänster inom revision, skatt, redovisning och specialistrådgivning.” Source: RevenueBase Database · checked Sep 23, 2026
19	Kpmg Poland	Partial evidence	Warsaw, PolandHQ checked Sep 23, 2026	1,001-5,000	1,696 contacts →
	Partial evidence “KPMG jest globalną organizacją niezależnych firm świadczących profesjonalne usługi z zakresu audytu, doradztwa podatkowego, finansowego, prawnego oraz consultingu.” Source: RevenueBase Database · checked Sep 23, 2026
20	Abylsen	Indirect evidence	Paris, FranceHQ checked Sep 23, 2026	1,001-5,000	1,577 contacts →
	Indirect evidence “In a world that too often follows currents, Abylsen has been opening itself up to new directions.” Source: RevenueBase Database · checked Sep 23, 2026
21	BDO Germany	Strong evidence	Hamburg, GermanyHQ checked Sep 23, 2026	1,001-5,000	1,576 contacts →
	Strong evidence “BDO is the leading entrepreneurial driven provider for audit and audit-related services, tax and business law consulting as well as advisory services.” Source: RevenueBase Database · checked Sep 23, 2026
22	Beierholm	Partial evidence	Aalborg, DenmarkHQ checked Sep 23, 2026	1,001-5,000	1,568 contacts →
	Partial evidence “Beierholm is the preferred auditing and consulting company for small and medium-sized companies in Denmark.” Source: RevenueBase Database · checked Sep 23, 2026
23	BDO Norge	Indirect evidence	Oslo, NorwayHQ checked Sep 23, 2026	1,001-5,000	1,530 contacts →
	Indirect evidence “We see great value in having a local presence and roots, factors which enable us to work closely with our clients.” Source: RevenueBase Database · checked Sep 23, 2026
24	P3	Partial evidence	Stuttgart, GermanyHQ checked Sep 23, 2026	1,001-5,000	1,468 contacts →
	Partial evidence “P3 group is an independent, owner-managed technology and management consulting group founded in 1996.” Source: RevenueBase Database · checked Sep 23, 2026
25	RSM Ebner Stolz	Indirect evidence	Stuttgart, GermanyHQ checked Sep 23, 2026	1,001-5,000	1,442 contacts →
	Indirect evidence “Wollen Sie jemanden, der Sie auch beim Sprung in neue Märkte und bei allen anstehenden Herausforderungen begleitet?” 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: business advisory and 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 business advisory and consulting firms.
Partial evidence: Its own public description names part of business advisory and consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name business advisory and 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 121,717 business advisory and consulting firms worldwide

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Business advisory and consulting firms worldwide at a glance

As of Sep 23, 2026

35.8%Verified-email coverage

16.1%Mobile-number coverage

9.0Average contacts per company

1-10Median size (employees)

3.2%Largest-city concentration · London

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

92,372

11-50

23,391

51-200

4,098

201-500

811

501-1,000

279

1,001-5,000

225

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 business advisory and 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: 45 countries, largest first: the United States, Brazil, the United Kingdom, France, Germany, Spain, Australia, Italy, Canada, the Netherlands and 35 more. Country and city lists for business advisory and consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “business advisory and 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 business advisory and 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 business advisory and 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, 392,412 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.

Business advisory and consulting firms by location

473 lists · largest first

Every Business advisory and 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 business advisory and 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 business advisory and consulting firms are there worldwide?

RevenueBase identified 121,717 business advisory and 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?

Ey-Parthenon, headquartered in London, tops this list with the largest team on record.

Which country has the most business advisory and consulting firms?

The United States leads with 34,709 companies, followed by Brazil (12,736) and the United Kingdom (10,259). Every business advisory and consulting firms list by country and city is linked on this page.

Which city has the most business advisory and consulting firms?

London leads with 3938 headquartered companies, followed by Sao Paulo (3251) and Paris (2262).

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 392,412 verified decision-maker contacts tracked across these 121,717 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.

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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.