Company lists · Data refreshed September 2026

Top 25 B2B consulting firms based in London, United Kingdom

Name: B2B 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 23, 2026 3,508 companies tracked

RevenueBase identified 3,508 B2B consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 45,332 professional contacts across them, including 19,735 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers B2B 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 23, 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 23, 2026 86% judged on-target in blind review

3,508Companies

45,332Contacts tracked

19,735Verified emails

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The 25 largest B2B consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 3,508 B2B consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to B2B 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-Parthenon	Indirect evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
2	Baringa	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	2,179 contacts →
	Partial evidence “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Source: RevenueBase Database · checked Sep 23, 2026
3	Oc&c Strategy Consultants	Indirect evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
4	Zenitech	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	408 contacts →
	Indirect evidence “Zenitech creates technology to transform businesses.” Source: RevenueBase Database · checked Sep 23, 2026
5	Hirexa Solutions	Indirect evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
6	Ubique Systems	Partial evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
7	Davies	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	5,001-10,000	329 contacts →
	Partial 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 23, 2026
8	Cartesian	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	302 contacts →
	Partial 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 23, 2026
9	Elixirr	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	275 contacts →
	Partial evidence “An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.” Source: RevenueBase Database · checked Sep 23, 2026
10	Transform	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	255 contacts →
	Partial evidence “Transform is a fresh alternative to Big Consulting.” Source: RevenueBase Database · checked Sep 23, 2026
11	Moorhouse B Corp Certified	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	247 contacts →
	Partial evidence “We’re a dynamic consulting firm, focused on delivering change.” Source: RevenueBase Database · checked Sep 23, 2026
12	Percipere	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	245 contacts →
	Indirect evidence “Percipere is a niche global consultancy, partnering companies in their evolution towards greater operational efficiency and profitability.” Source: RevenueBase Database · checked Sep 23, 2026
13	Albany Beck	Partial evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
14	Quantzig	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	216 contacts →
	Indirect evidence “Quantzig is at the forefront of partnering with businesses to help them unlock transformative value through analytics solutions.” Source: RevenueBase Database · checked Sep 23, 2026
15	Absolutelabs	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	192 contacts →
	Indirect evidence “AbsoluteLabs is a Salesforce Summit Partner and partner of Microsoft Azure, Amazon Web Services, and Google Cloud Platform.” Source: RevenueBase Database · checked Sep 23, 2026
16	True North Partners	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	185 contacts →
	Partial evidence “True North Partners LLP is an independent consulting firm based in London, Johannesburg, Frankfurt, Amsterdam and Madrid.” Source: RevenueBase Database · checked Sep 23, 2026
17	Azurian	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	178 contacts →
	Indirect evidence “The future has never moved this fast.” Source: RevenueBase Database · checked Sep 23, 2026
18	Clarasys	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	170 contacts →
	Partial evidence “We are an employee-owned, award-winning international consulting firm that believes there’s a better way to do consultancy.” Source: RevenueBase Database · checked Sep 23, 2026
19	BIP UK	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	5,001-10,000	167 contacts →
	Indirect evidence “BIP is the international consultancy for the 21st century with over 6,500 consultants globally daring to make a difference.” Source: RevenueBase Database · checked Sep 23, 2026
20	CVL	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	n/a	165 contacts →
	Indirect evidence “Strategic development for already dynamic businesses, successful mergers & acquisitions between household names, technology planning in cutting edge industries and real-world…” Source: RevenueBase Database · checked Sep 23, 2026
21	Interex Group	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	160 contacts →
	Indirect evidence “InterEx Group is becoming the strategic partner of choice for organizations undergoing digital, business, and technology transformation.” Source: RevenueBase Database · checked Sep 23, 2026
22	The Berkeley Partnership	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	152 contacts →
	Indirect evidence “Founded in 1990, The Berkeley Partnership is an independent management consultancy, specialising in business transformation.” Source: RevenueBase Database · checked Sep 23, 2026
23	ORG	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	139 contacts →
	Indirect evidence “We believe that change is an opportunity to thrive.” Source: RevenueBase Database · checked Sep 23, 2026
24	Publicis PRO	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	139 contacts →
	Partial evidence “Publicis Pro is the specialist B2B marketing agency within Publicis Groupe, the world's number one marketing holding group.” Source: RevenueBase Database · checked Sep 23, 2026
25	Veran Performance	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	134 contacts →
	Indirect evidence “Winners of the UKOUG Business Transformation Advisory Partner of the Year Award 2025 Veran Performance is an advisory consultancy specialising in HR, Payroll, Procurement and…” Source: RevenueBase Database · checked Sep 23, 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: B2B 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 B2B consulting firms.
Partial evidence: Its own public description names part of B2B consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name B2B 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 3,508 B2B consulting firms based in London, United Kingdom

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B2B consulting firms based in London, United Kingdom at a glance

As of Sep 23, 2026

43.5%Verified-email coverage

12.9Average contacts per company

1-10Median size (employees)

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

2,580

11-50

664

51-200

180

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 3,508 companies.

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 B2B 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 “B2B 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 B2B 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 B2B 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, 19,735 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 23, 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.

B2B 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 B2B 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 B2B consulting firms are there based in London, United Kingdom?

RevenueBase identified 3,508 B2B 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-Parthenon, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most B2B consulting firms?

London leads the United Kingdom with 3,508 headquartered companies, followed by Manchester (196) and Birmingham (108).

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 19,735 verified decision-maker contacts tracked across these 3,508 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 23, 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.