Company lists · Data refreshed September 2026

Top 25 Ada consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 27,515 companies tracked

RevenueBase identified 27,515 ada consulting firms worldwide as of September 2026 and tracks 535,280 professional contacts across them, including 171,202 with verified work emails and 105,627 with mobile numbers. The United States is the largest market and Paris the largest hub.

This list covers ada 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 22, 2026. Country and city lists for ada 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 22, 2026 86% judged on-target in blind review

27,515Companies

535,280Contacts tracked

171,202Verified emails

105,627Mobile numbers

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The 25 largest ada consulting firms worldwide

Ranked by team size

Top 25 of 27,515 ada consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to ada 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 22, 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 22, 2026
2	NTT Data North America	Indirect evidence	Plano, TX, United StatesHQ checked Sep 22, 2026	10001+	22,390 contacts →
	Indirect evidence “NTT DATA, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
3	ZS	Partial evidence	Evanston, IL, United StatesHQ checked Sep 22, 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 22, 2026
4	CDW	Indirect evidence	Vernon Hills, IL, United StatesHQ checked Sep 22, 2026	10001+	13,155 contacts →
	Indirect evidence “At CDW, we know how to make technology work so people can do great things.” Source: RevenueBase Database · checked Sep 22, 2026
5	Guidehouse	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 22, 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 22, 2026
6	Slalom	Partial evidence	Seattle, WA, United StatesHQ checked Sep 22, 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 22, 2026
7	World Wide Technology	Indirect evidence	Maryland Heights, MO, United StatesHQ checked Sep 22, 2026	10001+	9,184 contacts →
	Indirect evidence “We are thinkers and doers.” Source: RevenueBase Database · checked Sep 22, 2026
8	Protiviti	Partial evidence	Menlo Park, CA, United StatesHQ checked Sep 22, 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 22, 2026
9	Yash Technologies	Partial evidence	East Moline, IL, United StatesHQ checked Sep 22, 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 22, 2026
10	Wavestone	Partial evidence	100-101 Terrasse Boieldieu, FranceHQ checked Sep 22, 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 22, 2026
11	Accenture Strategy & Consulting	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	5,001-10,000	5,514 contacts →
	Indirect evidence “Accenture Strategy combines deep industry expertise, advanced analytics capabilities and human-led design methodologies that enable clients to act with speed and confidence.” Source: RevenueBase Database · checked Sep 22, 2026
12	Groupe SII	Indirect evidence	Paris, FranceHQ checked Sep 22, 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 22, 2026
13	ETEAM	Indirect evidence	Somerset, NJ, United StatesHQ checked Sep 22, 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 22, 2026
14	Visionet Systems INC	Indirect evidence	Cranbury, NJ, United StatesHQ checked Sep 22, 2026	10001+	3,119 contacts →
	Indirect evidence “Visionet is a premier digital technology solutions company built on the premise of disruptive innovation.” Source: RevenueBase Database · checked Sep 22, 2026
15	Genpact Headstrong Capital Markets	Partial evidence	Reston, VA, United StatesHQ checked Sep 22, 2026	10001+	3,109 contacts →
	Partial evidence “Genpact Headstrong Capital Markets is a global consulting and IT services company with a specialized focus in capital markets.” Source: RevenueBase Database · checked Sep 22, 2026
16	VEE Technologies	Partial evidence	Decatur, GA, United StatesHQ checked Sep 22, 2026	5,001-10,000	2,933 contacts →
	Partial evidence “Vee Technologies is a global consulting and professional services organization delivering specialized, technology-enabled solutions.” Source: RevenueBase Database · checked Sep 22, 2026
17	AUBAY	Indirect evidence	Boulogne Billancourt, FranceHQ checked Sep 22, 2026	5,001-10,000	2,670 contacts →
	Indirect evidence “Present in 7 countries in Europe, Aubay has more than 7800 employees and has generated revenues of € 513,5 million in 2022, with year on year growth consistently.” Source: RevenueBase Database · checked Sep 22, 2026
18	Speridian Technologies	Partial evidence	Albuquerque, NM, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,619 contacts →
	Partial evidence “Speridian Technologies is a global consulting and technology services firm that helps enterprises and public sector organizations modernize operations, enhance customer experience…” Source: RevenueBase Database · checked Sep 22, 2026
19	Alithya	Partial evidence	Montréal, QC, CanadaHQ checked Sep 22, 2026	1,001-5,000	2,338 contacts →
	Partial evidence “We are trusted advisors who leverage AI and the latest technologies in our strategic consulting and digital transformation services.” Source: RevenueBase Database · checked Sep 22, 2026
20	CTG	Indirect evidence	Amherst, NY, United StatesHQ checked Sep 22, 2026	5,001-10,000	2,264 contacts →
	Indirect evidence “CTG, a Cegeka company, is at the forefront of digital transformation, offering innovative IT solutions and services that accelerate your strategy and project momentum.” Source: RevenueBase Database · checked Sep 22, 2026
21	Astreya	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,215 contacts →
	Indirect evidence “Astreya is the leading IT solutions provider for some of the world's most recognizable and innovative organizations.” Source: RevenueBase Database · checked Sep 22, 2026
22	GFI World	Indirect evidence	Saint-ouen, FranceHQ checked Sep 22, 2026	10001+	2,169 contacts →
	Indirect evidence “Gfi became Inetum in 2020.” Source: RevenueBase Database · checked Sep 22, 2026
23	Keyrus	Indirect evidence	Levallois-perret, FranceHQ checked Sep 22, 2026	1,001-5,000	1,964 contacts →
	Indirect evidence “At Keyrus, we help organizations move from experimental AI to industrialized AI, from isolated agents to orchestrated systems, and from insight to execution.” Source: RevenueBase Database · checked Sep 22, 2026
24	Gspann Technologies, INC	Partial evidence	Milpitas, CA, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,878 contacts →
	Partial evidence “GSPANN is a US-based consulting services provider focused on implementations in Enterprise Content Management (ECM), Business Intelligence & Mobile Solutioning initiatives.” Source: RevenueBase Database · checked Sep 22, 2026
25	Davidson Consulting	Partial evidence	Boulogne-billancourt, FranceHQ checked Sep 22, 2026	1,001-5,000	1,848 contacts →
	Partial evidence “Founded in 2005, Davidson consulting is positioned as an actor in management consulting and technology expertise.” Source: RevenueBase Database · checked Sep 22, 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: ada 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 ada consulting firms.
Partial evidence: Its own public description names part of ada consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ada 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 27,515 ada consulting firms worldwide

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Ada consulting firms worldwide at a glance

As of Sep 22, 2026

32.0%Verified-email coverage

19.7%Mobile-number coverage

19.5Average contacts per company

1-10Median size (employees)

4.0%Largest-city concentration · Paris

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

17,502

11-50

6,440

51-200

2,519

201-500

595

501-1,000

209

1,001-5,000

127

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 ada 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: 4 countries, largest first: the United States, France, Canada, Australia. Country and city lists for ada consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “ada 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 ada 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 ada 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, 171,202 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 22, 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.

Ada consulting firms by location

141 lists · largest first

Every Ada 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 ada 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 ada consulting firms are there worldwide?

RevenueBase identified 27,515 ada 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 ada consulting firms?

The United States leads with 18,993 companies, followed by France (3,550) and Canada (2,925). Every ada consulting firms list by country and city is linked on this page.

Which city has the most ada consulting firms?

Paris leads with 1088 headquartered companies, followed by New York (665) and Toronto (656).

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 171,202 verified decision-maker contacts tracked across these 27,515 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 22, 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.