Company lists · Data refreshed September 2026

Top 25 Dei consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 7,871 companies tracked

RevenueBase identified 7,871 dei consulting firms worldwide as of September 2026 and tracks 59,051 professional contacts across them, including 13,575 with verified work emails. The United States is the largest market and London the largest hub.

This list covers dei 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 28, 2026. Country and city lists for dei 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 28, 2026 86% judged on-target in blind review

7,871Companies

59,051Contacts tracked

13,575Verified emails

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The 25 largest dei consulting firms worldwide

Ranked by team size

Top 25 of 7,871 dei consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to dei 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	Apside	Indirect evidence	Boulogne-billancourt, FranceHQ checked Sep 28, 2026	1,001-5,000	1,537 contacts →
	Indirect evidence “We are true to our word Expertise, trust, careers For 36 years, Apside has cooperated with the largest French and European groups on their IT and scientific projects.” Source: RevenueBase Database · checked Sep 28, 2026
2	Kpff Consulting Engineers	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,487 contacts →
	Indirect evidence “KPFF is a multi-office, multi-discipline engineering firm.” Source: RevenueBase Database · checked Sep 28, 2026
3	GEA	Indirect evidence	Milano, ItalyHQ checked Sep 28, 2026	n/a	983 contacts →
	Indirect evidence “Fondata nel 1965, GEA è la società di consulenza di direzione da più tempo al fianco della realtà imprenditoriale italiana e delle aziende del made in Italy.” Source: RevenueBase Database · checked Sep 28, 2026
4	Sigma Industry	Indirect evidence	Stockholm, SwedenHQ checked Sep 28, 2026	1,001-5,000	688 contacts →
	Indirect evidence “Sigma Industry har tagit ett långsiktigt åtagande för att förnya konsultbranschen inom ingenjörstjänster.” Source: RevenueBase Database · checked Sep 28, 2026
5	DLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	201-500	546 contacts →
	Partial evidence “DLC is an award-winning industry leader in Finance, Accounting, Program Management & Process Improvement Consulting.” Source: RevenueBase Database · checked Sep 28, 2026
6	Implid	Indirect evidence	Lyon, FranceHQ checked Sep 28, 2026	501-1,000	502 contacts →
	Indirect evidence “Depuis plus de 40 ans, nos équipes de spécialistes accompagnent nos clients de petites, moyennes et grandes entreprises, dans le pilotage de leurs organisations, la gestion des…” Source: RevenueBase Database · checked Sep 28, 2026
7	PT Wiratman	Partial evidence	Jakarta, IndonesiaHQ checked Sep 28, 2026	201-500	423 contacts →
	Partial evidence “Established in 1976, PT Wiratman is a full-service multidisciplinary consulting firm, with its headquarters in Jakarta, Indonesia PT Wiratman is an independent, multidisciplinary…” Source: RevenueBase Database · checked Sep 28, 2026
8	Deloitte Consulting	Indirect evidence	Milan, ItalyHQ checked Sep 28, 2026	10001+	406 contacts →
	Indirect evidence “Deloitte è tra le più grandi realtà nei servizi professionali alle imprese in Italia, dove è presente da circa 100 anni.” Source: RevenueBase Database · checked Sep 28, 2026
9	Osmani & Company Pvt. LTD	Indirect evidence	Karachi, PakistanHQ checked Sep 28, 2026	501-1,000	361 contacts →
	Indirect evidence “Osmani & Company Private Limited (OCL) is one of the oldest, largest and most reputed consultancy organizations of Pakistan.” Source: RevenueBase Database · checked Sep 28, 2026
10	Askblue	Partial evidence	Lisbon, PortugalHQ checked Sep 28, 2026	201-500	341 contacts →
	Partial evidence “AskBlue is a company created in 2013 that provides specialized consulting services in the financial sector and information technology.” Source: RevenueBase Database · checked Sep 28, 2026
11	Hspi S.P.A	Indirect evidence	Bologna, ItalyHQ checked Sep 28, 2026	201-500	298 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
12	Exiom Partners	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	51-200	241 contacts →
	Indirect evidence “Fondé en 2019 par des associés de grands cabinets de conseil, Exiom Partners est un cabinet spécialisé dans les Services Financiers pensé pour proposer un modèle de management…” Source: RevenueBase Database · checked Sep 28, 2026
13	LCG	Partial evidence	Lisbon, PortugalHQ checked Sep 28, 2026	201-500	230 contacts →
	Partial evidence “LCG provides consulting services, using their multidisciplinary skills in the areas of strategic and operational management, information systems, management support, business…” Source: RevenueBase Database · checked Sep 28, 2026
14	Semaphores	Partial evidence	Paris, FranceHQ checked Sep 28, 2026	201-500	223 contacts →
	Partial evidence “Semaphores, a consulting and expertise firm, is involved in a very wide range of skills: from public accounting to organizational strategy projects, including organization…” Source: RevenueBase Database · checked Sep 28, 2026
15	MSR Consulting Group Gmbh	Indirect evidence	Köln, GermanyHQ checked Sep 28, 2026	n/a	223 contacts →
	Indirect evidence “Wir fokussieren uns auf die Branchen Automobil- und Fahrzeugbau, Industrie (insbes.” Source: RevenueBase Database · checked Sep 28, 2026
16	Emendo Consulting Group	Indirect evidence	Nordhavn, DenmarkHQ checked Sep 28, 2026	201-500	221 contacts →
	Indirect evidence “Emendo is Latin and translates to "improve" or "eliminate errors," which perfectly describes our work and what we do.” Source: RevenueBase Database · checked Sep 28, 2026
17	Accretive Solutions	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	501-1,000	217 contacts →
	Indirect evidence “Your World.” Source: RevenueBase Database · checked Sep 28, 2026
18	Sparke & Keane	Partial evidence	Eindhoven, NetherlandsHQ checked Sep 28, 2026	51-200	214 contacts →
	Partial evidence “Wij zijn experts in Strategy Consulting, Lean Project & Project Management, Digital Transformation, Finance & Control en Business Intelligence.” Source: RevenueBase Database · checked Sep 28, 2026
19	Protom	Indirect evidence	Naples, ItalyHQ checked Sep 28, 2026	201-500	212 contacts →
	Indirect evidence “We support our Clients in their business development, designing and delivering for them knowledge & technology-intensive solutions, products & services SOLUTIONS & PRODUCTS We…” Source: RevenueBase Database · checked Sep 28, 2026
20	Lattanzio Kibs Benefit Corporation	Indirect evidence	Milan, ItalyHQ checked Sep 28, 2026	51-200	206 contacts →
	Indirect evidence “Lattanzio KIBS S.p.A.” Source: RevenueBase Database · checked Sep 28, 2026
21	Techsolution	Indirect evidence	São José Dos Pinhais, BrazilHQ checked Sep 28, 2026	201-500	203 contacts →
	Indirect evidence “Desde 2011, a TECHSOLUTION é parceira estratégica de empresas que buscam eficiência, inovação e resultados sustentáveis no ambiente industrial.” Source: RevenueBase Database · checked Sep 28, 2026
22	Studio Commerciale Associato	Indirect evidence	ItalyHQ checked Sep 28, 2026	n/a	191 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
23	Berotec	Indirect evidence	Stockholm, SwedenHQ checked Sep 28, 2026	201-500	189 contacts →
	Indirect evidence “Vi har samlat Sveriges skarpaste ingenjörer, handplockade för sin unika kompetens, och utvalda för något större: sin förmåga att samarbeta och förstå vad som krävs för att leda…” Source: RevenueBase Database · checked Sep 28, 2026
24	ADD Inc, NOW Stantec	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	10001+	186 contacts →
	Indirect evidence “ADD Inc.” Source: RevenueBase Database · checked Sep 28, 2026
25	NEW York Technology Partners	Partial evidence	Jersey City, NJ, United StatesHQ checked Sep 28, 2026	201-500	185 contacts →
	Partial evidence “Established in New York Technology Partners is a global IT and Engineering consulting services company with 250+ employees on staff in the US and over $30 million in revenues.” Source: RevenueBase Database · checked Sep 28, 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: dei 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 dei consulting firms.
Partial evidence: Its own public description names part of dei consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name dei 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 7,871 dei consulting firms worldwide

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Dei consulting firms worldwide at a glance

As of Sep 28, 2026

23.0%Verified-email coverage

7.5Average contacts per company

1-10Median size (employees)

3.2%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

5,803

11-50

1,586

51-200

342

201-500

501-1,000

1,001-5,000

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 dei 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 dei consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “dei 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 dei 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 dei 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, 13,575 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 28, 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.

Dei consulting firms by location

53 lists · largest first

Every Dei 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 dei 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 dei consulting firms are there worldwide?

RevenueBase identified 7,871 dei 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?

Apside, headquartered in Boulogne-Billancourt, tops this list with the largest team on record.

Which country has the most dei consulting firms?

The United States leads with 2,053 companies, followed by the United Kingdom (470) and Brazil (420). Every dei consulting firms list by country and city is linked on this page.

Which city has the most dei consulting firms?

London leads with 249 headquartered companies, followed by Paris (143) and Sao Paulo (143).

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 13,575 verified decision-maker contacts tracked across these 7,871 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 28, 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.