Company lists · Data refreshed October 2026

Top 25 International business consulting firms based in the United Kingdom

Name: International business consulting firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 3,362 companies tracked

RevenueBase identified 3,362 company matches for international business consulting firms associated with the United Kingdom as of October 2026 and tracks 44,984 professional contacts across them, including 16,693 with verified work emails and 4,257 with mobile numbers. London is the largest hub.

This list covers company matches for international business consulting firms associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Oct 1, 2026 How this list was built

3,362Companies

44,984Contacts tracked

16,693Verified emails

4,257Mobile numbers

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The 25 largest international business consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 3,362 company matches for international business consulting firms based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Ey-Parthenon	Exact match	London, United KingdomHQ recorded Oct 1, 2026	10001+	17,070 contacts →
	Exact match “Our unique combination of transformative strategy, transactions and corporate finance delivers real-world value – solutions that work in practice, not just on paper.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
2	AZETS	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	5,632 contacts →
	Exact match “Azets is an international business advisory group, with local experts in 190 locations across eight countries, backed by progressive technology.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	Baringa	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	2,179 contacts →
	Exact match “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	Oc&c Strategy Consultants	Exact match	London, United KingdomHQ recorded Oct 1, 2026	501-1,000	1,011 contacts →
	Exact match “At OC & C Strategy Consultants we have more than 35 years of experience at unpicking the most complex business challenges with simple, uncommon sense™.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	Strategy Insights	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	528 contacts →
	Exact match “Strategy Insights is a specialist business and economic development consultancy.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	Cartesian	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	302 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	Elixirr	Exact match	London, United KingdomHQ recorded Oct 1, 2026	501-1,000	275 contacts →
	Exact match “An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	CT Group	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	233 contacts →
	Exact match “CT Group is a global consultancy that uniquely combines research, intelligence, campaigns and advisory services, to deliver the results our clients need.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	Clarify	Exact match	Theale, United KingdomHQ recorded Oct 1, 2026	51-200	191 contacts →
	Exact match “Clarify helps global Technology companies achieve sustained and significant commercial success.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	True North Partners	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	185 contacts →
	Exact match “True North Partners LLP is an independent consulting firm based in London, Johannesburg, Frankfurt, Amsterdam and Madrid.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	Intralink	Exact match	Abingdon, United KingdomHQ recorded Oct 1, 2026	51-200	185 contacts →
	Exact match “Intralink is a business development consultancy specialising in international markets.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	BIP UK	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	167 contacts →
	Exact match “BIP is the international consultancy for the 21st century with over 6,500 consultants globally daring to make a difference.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	TXM Consult	Exact match	Milton Keynes, United KingdomHQ recorded Oct 1, 2026	51-200	166 contacts →
	Exact match “In an uncertain, complex, and ambiguous world, business change is essential and inevitable.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Athens	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	122 contacts →
	Exact match “Athens helps clients make superior investment decisions and supports them to deliver value from these decisions through timely implementation.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	Valiant Business Media	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	108 contacts →
	Exact match “Valiant Business Media is a global business intelligence and consulting group.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	Humanhire Corp	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	104 contacts →
	Exact match “HumanHire Corp established in 2014 focuses to provide the most reliable and relevant resources based on client needs.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	K3 Capital Group	Exact match	Manchester, United KingdomHQ recorded Oct 1, 2026	501-1,000	97 contacts →
	Exact match “K3 Capital Group is a professional services firm providing advisory services to SMEs throughout the UK and overseas.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	BDO Northern Ireland	Exact match	Belfast, United KingdomHQ recorded Oct 1, 2026	51-200	93 contacts →
	Exact match “BDO NI specialises in helping businesses, whether start-ups or multinationals, to grow.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	Panterra	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	83 contacts →
	Exact match “For nearly three decades, Panterra has acted as a strategic adviser to governments, corporations, and individuals.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
20	Cambridge Management Consulting	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	82 contacts →
	Exact match “Cambridge Management Consulting (Cambridge MC) is an international consulting firm that helps companies of all sizes have a better impact on the world.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
21	Plural Strategy	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	78 contacts →
	Exact match “Plural Strategy is a strategy consultancy for the media, information and technology industries.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	Eden Mccallum	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	75 contacts →
	Exact match “We redefined management consulting to make it better for clients and better for consultants.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	Idex Consulting LTD	Exact match	Birmingham, United KingdomHQ recorded Oct 1, 2026	51-200	72 contacts →
	Exact match “IDEX Consulting is an innovative Business Growth Consultancy specialising in transforming lives, careers and businesses by offering a bespoke service within the Insurance…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
24	Excalibur Communications	Exact match	Swindon, United KingdomHQ recorded Oct 1, 2026	51-200	72 contacts →
	Exact match “Excalibur provides an end to end business consulting service that offers reliable insight, and expertise in communications and technology.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
25	Punter Southall	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	72 contacts →
	Exact match “Punter Southall is a group of companies with one aim – helping businesses and people make better decisions.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “international business consulting firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 3,362 international business consulting firms based in the United Kingdom

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International business consulting firms based in the United Kingdom at a glance

As of Oct 1, 2026

37.1%Verified-email coverage

9.5%Mobile-number coverage

13.4Average contacts per company

1-10Median size (employees)

41.8%Largest-city concentration · London

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

2,669

11-50

492

51-200

111

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 34.0d

2,7620–30

13,04731–60

67461–90

3690–180

174180+

Company record updated

Median 82.0d

00–30

6,64231–60

20,20261–90

15,70290–180

2,438180+

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United Kingdom whose business descriptions match “international business consulting firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 16,693 professional contacts with verified work emails across the full matched dataset. 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 October 1, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

International business consulting firms by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “international business consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many international business consulting firms are there based in the United Kingdom?

RevenueBase identified 3,362 company matches for international business consulting firms associated with the United Kingdom as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Ey-Parthenon tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most international business consulting firms?

London leads with 1405 company records, followed by Manchester (60) and Glasgow (42).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 16,693 professional contacts with verified work emails tracked across these 3,362 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 1, 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 SmartSearch, 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.