Company lists · Data refreshed September 2026

Top 25 Global consulting firms based in London, United Kingdom

Name: Global consulting firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 2,552 companies tracked

RevenueBase identified 2,552 global consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 442,333 professional contacts across them, including 166,892 with verified work emails and 45,099 with mobile numbers. London is the largest hub.

This list covers global consulting firms headquartered in London, United Kingdom, 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 12, 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 12, 2026 86% judged on-target in blind review

2,552Companies

442,333Contacts tracked

166,892Verified emails

45,099Mobile numbers

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The 25 largest global consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 2,552 global consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to global 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	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	10001+	375,085 contacts →
	Indirect evidence “EY is building a better working world by creating new value for clients, people, society, the planet, while building trust in the capital markets.” Source: RevenueBase Database · checked Sep 12, 2026
2	CAPCO	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	5,001-10,000	7,396 contacts →
	Partial evidence “Capco, a Wipro company, is a global technology and management consultancy specializing in driving digital transformation in the financial services industry.” Source: RevenueBase Database · checked Sep 12, 2026
3	AZETS	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	5,001-10,000	5,632 contacts →
	Indirect 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 12, 2026
4	RSM	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	10001+	3,630 contacts →
	Strong evidence “RSM is a leading global network of assurance, tax and consulting firms focused on the middle-market.” Source: RevenueBase Database · checked Sep 12, 2026
5	Baringa	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1,001-5,000	2,179 contacts →
	Strong evidence “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Source: RevenueBase Database · checked Sep 12, 2026
6	Oc&c Strategy Consultants	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	501-1,000	1,011 contacts →
	Indirect evidence “At OC & C Strategy Consultants we have more than 35 years of experience at unpicking the most complex business challenges with simple, uncommon sense™.” Source: RevenueBase Database · checked Sep 12, 2026
7	Strategy Insights	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	528 contacts →
	Indirect evidence “Strategy Insights is a specialist business and economic development consultancy.” Source: RevenueBase Database · checked Sep 12, 2026
8	STEER	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	524 contacts →
	Indirect evidence “Complex challenges.” Source: RevenueBase Database · checked Sep 12, 2026
9	Mazars In The UK	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1,001-5,000	505 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 12, 2026
10	Analysys Mason	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	459 contacts →
	Indirect evidence “Analysys Mason is the leading specialist consultancy, creating lasting value in technology-intensive industries, including telecoms, digital infrastructure, software, IT services…” Source: RevenueBase Database · checked Sep 12, 2026
11	Hirexa Solutions	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	377 contacts →
	Indirect evidence “Hirexa Solutions is a leading group of companies committed to delivering exceptional services to Fortune 500 clients worldwide.” Source: RevenueBase Database · checked Sep 12, 2026
12	Softwire	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	360 contacts →
	Indirect evidence “Softwire exists to help organisations use technology to deliver meaningful outcomes and a positive impact for themselves, their users and the world.” Source: RevenueBase Database · checked Sep 12, 2026
13	Emergn	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	501-1,000	351 contacts →
	Partial evidence “Emergn is a global technology and management consultancy built on a simple conviction: the only sustainable competitive advantage is the way you work.” Source: RevenueBase Database · checked Sep 12, 2026
14	Ubique Systems	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	501-1,000	333 contacts →
	Partial evidence “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Source: RevenueBase Database · checked Sep 12, 2026
15	Mercer UK	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	10001+	329 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 12, 2026
16	Davies	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	5,001-10,000	329 contacts →
	Strong evidence “We are the global consulting division of Davies, accelerating business, technology and people performance across financial services including Retail Finance & Corporate Banking…” Source: RevenueBase Database · checked Sep 12, 2026
17	Cartesian	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	302 contacts →
	Strong evidence “Cartesian is a specialist consulting firm focused on the global telecommunications, media, and technology industries and is now part of Bounteous, an AI services firm helping…” Source: RevenueBase Database · checked Sep 12, 2026
18	CIL Strategy Consultants	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	284 contacts →
	Partial evidence “CIL is a global growth strategy consultancy.” Source: RevenueBase Database · checked Sep 12, 2026
19	Quantuma	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	277 contacts →
	Indirect evidence “Quantuma is a leading business advisory firm which works with businesses at the key milestones.” Source: RevenueBase Database · checked Sep 12, 2026
20	Elixirr	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	501-1,000	275 contacts →
	Strong evidence “An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.” Source: RevenueBase Database · checked Sep 12, 2026
21	Transform	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	255 contacts →
	Partial evidence “Transform is a fresh alternative to Big Consulting.” Source: RevenueBase Database · checked Sep 12, 2026
22	Moorhouse B Corp Certified	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	247 contacts →
	Partial evidence “We’re a dynamic consulting firm, focused on delivering change.” Source: RevenueBase Database · checked Sep 12, 2026
23	Percipere	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	245 contacts →
	Partial evidence “Percipere is a niche global consultancy, partnering companies in their evolution towards greater operational efficiency and profitability.” Source: RevenueBase Database · checked Sep 12, 2026
24	Sheffield Haworth	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	244 contacts →
	Partial evidence “Sheffield Haworth is a global consultancy founded in 1993.” Source: RevenueBase Database · checked Sep 12, 2026
25	Albany Beck	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	240 contacts →
	Partial evidence “Albany Beck is a client-first consulting firm helping financial services organisations deliver complex change and build capability, not dependency.” Source: RevenueBase Database · checked Sep 12, 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: global 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 global consulting firms.
Partial evidence: Its own public description names part of global consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name global 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 2,552 global consulting firms based in London, United Kingdom

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Global consulting firms based in London, United Kingdom at a glance

As of Sep 12, 2026

37.7%Verified-email coverage

10.2%Mobile-number coverage

173.3Average contacts per company

1-10Median size (employees)

69.3%Largest-city concentration · London

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

1,729

11-50

554

51-200

168

201-500

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 15.0d

140,9950–30

22,97431–60

74661–90

25890–180

1,919180+

Company record updated

Median 61.0d

00–30

218,76331–60

154,66561–90

44,10490–180

24,801180+

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 global 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 London, United Kingdom whose own description of what they do matches “global 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 global 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 global consulting firms, and records with no verified work email. Companies headquartered outside London 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, 166,892 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 12, 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.

Global consulting firms by metro in the United Kingdom

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 global 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 global consulting firms are there based in London, United Kingdom?

RevenueBase identified 2,552 global consulting firms headquartered in London, United Kingdom 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, headquartered in London, tops this list with the largest team on record.

Which city has the most global consulting firms?

London leads with 1768 headquartered companies, followed by Manchester (99) and Bristol (55).

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 166,892 verified decision-maker contacts tracked across these 2,552 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 12, 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.