Company lists · Data refreshed September 2026

Top 25 Impact consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 99,885 companies tracked

RevenueBase identified 99,885 impact consulting firms worldwide as of September 2026 and tracks 1,094,006 professional contacts across them, including 405,906 with verified work emails and 176,073 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers impact 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 30, 2026. Country and city lists for impact 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 30, 2026 86% judged on-target in blind review

99,885Companies

1,094,006Contacts tracked

405,906Verified emails

176,073Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest impact consulting firms worldwide

Ranked by team size

Top 25 of 99,885 impact consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to impact 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	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
2	Autonomo	Indirect evidence	Córdoba, SpainHQ checked Sep 30, 2026	n/a	23,018 contacts →
	Indirect evidence “Calidad y Gestión es una empresa consultora de ámbito internacional especializada en servicios de asesoría en las siguientes áreas: Calidad Medio Ambiente Responsabilidad social…” Source: RevenueBase Database · checked Sep 30, 2026
3	Bain & Company	Indirect evidence	Boston, MA, United StatesHQ checked Sep 30, 2026	10001+	21,689 contacts →
	Indirect evidence “Bain & Company is a global consultancy that helps the world’s most ambitious change makers define the future.” Source: RevenueBase Database · checked Sep 30, 2026
4	Mercer	Indirect evidence	New York, NY, United StatesHQ checked Sep 30, 2026	10001+	20,868 contacts →
	Indirect evidence “At Mercer, A Marsh business, we’re helping our clients realize their investment objectives, shape the future of work, and enhance health and retirement outcomes for their people.” Source: RevenueBase Database · checked Sep 30, 2026
5	Ey-Parthenon	Indirect evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
6	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
7	Korn Ferry	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 30, 2026	10001+	13,486 contacts →
	Partial evidence “Korn Ferry is a global consulting firm that powers performance.” Source: RevenueBase Database · checked Sep 30, 2026
8	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
9	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
10	ERM	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	5,001-10,000	9,119 contacts →
	Indirect evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 30, 2026
11	FTI Consulting	Partial evidence	Washington, DC, United StatesHQ checked Sep 30, 2026	5,001-10,000	8,964 contacts →
	Partial evidence “FTI Consulting is the leading global expert firm for organizations facing crisis and transformation, with more than 8,100 employees in 32 countries and territories.” Source: RevenueBase Database · checked Sep 30, 2026
12	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
13	Oliver Wyman	Indirect evidence	New York, NY, United StatesHQ checked Sep 30, 2026	5,001-10,000	8,230 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 30, 2026
14	Bearingpoint	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 30, 2026	5,001-10,000	8,106 contacts →
	Indirect evidence “BearingPoint is an independent management and technology consultancy.” Source: RevenueBase Database · checked Sep 30, 2026
15	Deloitte Digital	Partial evidence	Usa, FranceHQ checked Sep 30, 2026	10001+	7,716 contacts →
	Partial evidence “At Deloitte Digital, we connect brands with the right strategies and tools to create great impact.” Source: RevenueBase Database · checked Sep 30, 2026
16	HURON	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 30, 2026	5,001-10,000	7,520 contacts →
	Indirect evidence “Huron is a global professional services firm that collaborates with organizations to solve complex challenges and achieve ambitious goals.” Source: RevenueBase Database · checked Sep 30, 2026
17	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
18	Wavestone	Partial evidence	100-101 Terrasse Boieldieu, FranceHQ checked Sep 30, 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 30, 2026
19	Tiger Analytics	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 30, 2026	5,001-10,000	6,160 contacts →
	Indirect evidence “In a world rife with complexity, we help our customers cut through uncertainty, plan strategically, and execute confidently.” Source: RevenueBase Database · checked Sep 30, 2026
20	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
21	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
22	PA Consulting	Indirect evidence	London, United StatesHQ checked Sep 30, 2026	1,001-5,000	4,950 contacts →
	Indirect evidence “We believe in the power of ingenuity to build a positive human future.” Source: RevenueBase Database · checked Sep 30, 2026
23	Bank Of The West	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 30, 2026	n/a	4,751 contacts →
	Indirect evidence “We help businesses and nonprofits grow, communicate, and succeed, professionally and affordably.” Source: RevenueBase Database · checked Sep 30, 2026
24	Roland Berger	Indirect evidence	Munich, GermanyHQ checked Sep 30, 2026	1,001-5,000	4,632 contacts →
	Indirect evidence “Roland Berger is the only leading global strategy consultancy of European origin.” Source: RevenueBase Database · checked Sep 30, 2026
25	BIP	Indirect evidence	Milan, ItalyHQ checked Sep 30, 2026	5,001-10,000	4,548 contacts →
	Indirect evidence “A network of thinkers, creatives and creators.” 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: impact 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 impact consulting firms.
Partial evidence: Its own public description names part of impact consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name impact 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 99,885 impact consulting firms worldwide

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 405,906 reachable decision-makers.

Free signup · no credit card

View the full list →

Impact consulting firms worldwide at a glance

As of Sep 30, 2026

37.1%Verified-email coverage

16.1%Mobile-number coverage

11.0Average contacts per company

1-10Median size (employees)

3.6%Largest-city concentration · London

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

78,213

11-50

16,952

51-200

3,300

201-500

669

501-1,000

233

1,001-5,000

228

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 impact 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: 43 countries, largest first: the United States, Brazil, the United Kingdom, France, Germany, Canada, Australia, Spain, Italy, the Netherlands and 33 more. Country and city lists for impact consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “impact 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 impact 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 impact 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, 405,906 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.

Impact consulting firms by location

377 lists · largest first

Every Impact 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 impact 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 impact consulting firms are there worldwide?

RevenueBase identified 99,885 impact 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?

Boston Consulting Group BCG, headquartered in Boston, tops this list with the largest team on record.

Which country has the most impact consulting firms?

The United States leads with 32,575 companies, followed by Brazil (8,644) and the United Kingdom (8,107). Every impact consulting firms list by country and city is linked on this page.

Which city has the most impact consulting firms?

London leads with 3636 headquartered companies, followed by Paris (2680) and Sao Paulo (2538).

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 405,906 verified decision-maker contacts tracked across these 99,885 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.

Ready to reach these companies? Verified emails and direct dials for all 99,885 impact consulting firms worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.