Company lists · Data refreshed September 2026

Top 25 Full-service consulting firms based in the United States

Name: Full-service consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 19,968 companies tracked

RevenueBase identified 19,968 full-service consulting firms headquartered in the United States as of September 2026 and tracks 400,340 professional contacts across them, including 162,199 with verified work emails and 115,821 with mobile numbers. New York is the largest hub.

This list covers full-service consulting firms headquartered in the United States, 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 30, 2026.

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 30, 2026 86% judged on-target in blind review

19,968Companies

400,340Contacts tracked

162,199Verified emails

115,821Mobile numbers

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The 25 largest full-service consulting firms based in the United States

Ranked by team size

Top 25 of 19,968 full-service consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to full-service 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 30, 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 30, 2026
2	Boston Consulting Group BCG	Partial evidence	Boston, MA, United StatesHQ checked Sep 30, 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 30, 2026
3	ZS	Partial evidence	Evanston, IL, United StatesHQ checked Sep 30, 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 30, 2026
4	Alvarez & Marsal	Indirect evidence	New York, NY, United StatesHQ checked Sep 30, 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 30, 2026
5	Slalom	Partial evidence	Seattle, WA, United StatesHQ checked Sep 30, 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 30, 2026
6	WSP In The U.S	Indirect evidence	New York, NY, United StatesHQ checked Sep 30, 2026	10001+	9,318 contacts →
	Indirect evidence “What if you could shape built and natural environments – and the future of those that use them?” Source: RevenueBase Database · checked Sep 30, 2026
7	World Wide Technology	Indirect evidence	Maryland Heights, MO, United StatesHQ checked Sep 30, 2026	10001+	9,184 contacts →
	Indirect evidence “We are thinkers and doers.” Source: RevenueBase Database · checked Sep 30, 2026
8	Protiviti	Partial evidence	Menlo Park, CA, United StatesHQ checked Sep 30, 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 30, 2026
9	Yash Technologies	Partial evidence	East Moline, IL, United StatesHQ checked Sep 30, 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 30, 2026
10	Kearney	Partial evidence	Chicago, IL, United StatesHQ checked Sep 30, 2026	5,001-10,000	6,978 contacts →
	Partial 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 30, 2026
11	Accenture Strategy & Consulting	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 30, 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 30, 2026
12	Strategy	Indirect evidence	New York, NY, United StatesHQ checked Sep 30, 2026	1,001-5,000	5,082 contacts →
	Indirect evidence “From strategy to execution.” Source: RevenueBase Database · checked Sep 30, 2026
13	Eisneramper	Partial evidence	New York, NY, United StatesHQ checked Sep 30, 2026	1,001-5,000	4,199 contacts →
	Partial evidence “EisnerAmper, one of the largest business consulting firms in the world, is comprised of EisnerAmper LLP, a licensed independent CPA firm that provides client attest services; and…” Source: RevenueBase Database · checked Sep 30, 2026
14	L.E.K. Consulting	Indirect evidence	Boston, MA, United StatesHQ checked Sep 30, 2026	1,001-5,000	4,093 contacts →
	Indirect evidence “L.E.K.” Source: RevenueBase Database · checked Sep 30, 2026
15	DAI	Partial evidence	Bethesda, MD, United StatesHQ checked Sep 30, 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 30, 2026
16	Alixpartners	Indirect evidence	New York, NY, United StatesHQ checked Sep 30, 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 30, 2026
17	Armanino	Indirect evidence	San Ramon, CA, United StatesHQ checked Sep 30, 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 30, 2026
18	Speridian Technologies	Partial evidence	Albuquerque, NM, United StatesHQ checked Sep 30, 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 30, 2026
19	Frost & Sullivan	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 30, 2026	1,001-5,000	2,330 contacts →
	Indirect evidence “For over six decades, Frost & Sullivan has helped the world’s top companies toward transformational growth journeys that result in a stream of innovative growth opportunities.” Source: RevenueBase Database · checked Sep 30, 2026
20	Uhy-Us	Partial evidence	New York, NY, United StatesHQ checked Sep 30, 2026	1,001-5,000	2,035 contacts →
	Partial evidence “UHY is one of the nation’s largest professional services firms providing audit, tax, consulting and advisory services to clients primarily in the dynamic middle market.” Source: RevenueBase Database · checked Sep 30, 2026
21	LJA	Indirect evidence	Houston, TX, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,932 contacts →
	Indirect evidence “Employee-Owned.” Source: RevenueBase Database · checked Sep 30, 2026
22	North Highland	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,792 contacts →
	Indirect evidence “North Highland helps businesses move from strategy to reality, taking a pragmatic and practical approach to build solutions that work and create impact that lasts.” Source: RevenueBase Database · checked Sep 30, 2026
23	Sikich	Partial evidence	Chicago, IL, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,688 contacts →
	Partial evidence “Sikich offers the public and private sectors a diverse platform of professional services across consulting, technology, and compliance.” Source: RevenueBase Database · checked Sep 30, 2026
24	Argano	Indirect evidence	Plano, TX, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,603 contacts →
	Indirect evidence “Argano is the world’s first and largest digital services consultancy focused exclusively on enabling high performance across our clients’ business operations, at scale and around…” Source: RevenueBase Database · checked Sep 30, 2026
25	Davey Resource Group, INC	Partial evidence	Kent, OH, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,395 contacts →
	Partial evidence “Davey Resource Group, Inc.(DRG) provides innovative consulting and field services that support utility infrastructure and environmental stewardship.” Source: RevenueBase Database · checked Sep 30, 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: full-service 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 full-service consulting firms.
Partial evidence: Its own public description names part of full-service consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name full-service 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 19,968 full-service consulting firms based in the United States

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Full-service consulting firms based in the United States at a glance

As of Sep 30, 2026

40.5%Verified-email coverage

28.9%Mobile-number coverage

20.0Average contacts per company

1-10Median size (employees)

4.7%Largest-city concentration · New York

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

14,182

11-50

3,980

51-200

1,296

201-500

286

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 33.0d

48,0230–30

105,61931–60

6,58861–90

19590–180

1,774180+

Company record updated

Median 80.0d

00–30

71,10331–60

146,32361–90

158,23290–180

24,682180+

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 full-service 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “full-service 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 full-service 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 full-service consulting firms, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 162,199 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 30, 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.

Full-service consulting firms by metro

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 full-service 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 full-service consulting firms are there based in the United States?

RevenueBase identified 19,968 full-service consulting firms headquartered in the United States 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 city has the most full-service consulting firms?

New York leads with 935 headquartered companies, followed by Chicago (496) and Atlanta (479).

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 162,199 verified decision-maker contacts tracked across these 19,968 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 30, 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.