Company lists · Data refreshed September 2026

Top 25 Consultancy firms based in London, United Kingdom

Name: Consultancy 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 24, 2026 7,716 companies tracked

RevenueBase identified 7,716 company matches for consultancy firms associated with London, United Kingdom as of September 2026 and tracks 85,017 professional contacts across them, including 34,860 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for consultancy firms associated with London, 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 September 24, 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 Sep 24, 2026 How this list was built

7,716Companies

85,017Contacts tracked

34,860Verified emails

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The 25 largest consultancy firms based in London, United Kingdom

Ranked by team size

Top 25 of 7,716 company matches for consultancy firms based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 24, 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	MACE	Exact match	London, United KingdomHQ recorded Sep 24, 2026	5,001-10,000	8,458 contacts →
	Exact match “Mace Consult launched as a new and independent business on 5 March 2026, through a carve-out from Mace Group.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
2	AZETS	Exact match	London, United KingdomHQ recorded Sep 24, 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 · Sep 24, 2026 · View company records in RevenueBase
3	Baringa	Exact match	London, United KingdomHQ recorded Sep 24, 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 · Sep 24, 2026 · View company records in RevenueBase
4	Antal International	Exact match	London, United KingdomHQ recorded Sep 24, 2026	1,001-5,000	1,979 contacts →
	Exact match “Antal International is a global executive search organisation with over 130 offices in more than 30 countries.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
5	Barnett Waddingham	Exact match	London, United KingdomHQ recorded Sep 24, 2026	1,001-5,000	1,331 contacts →
	Exact match “We are a leading UK professional services consultancy at the forefront of risk, pensions, investment and insurance.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
6	Efficio	Exact match	London, United KingdomHQ recorded Sep 24, 2026	1,001-5,000	1,304 contacts →
	Exact match “Efficio is a global leader in procurement and supply chain management and transformation.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
7	Blackmont Consulting	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	1,221 contacts →
	Exact match “Blackmont Consulting provides 100% free advisory services to NGO´s, NPO´s and start-ups.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
8	Moore Kingston Smith	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	1,151 contacts →
	Exact match “At Moore Kingston Smith, we believe in the potential of people to make a positive impact, fuelled by the power of genuine understanding.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
9	Oc&c Strategy Consultants	Exact match	London, United KingdomHQ recorded Sep 24, 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 · Sep 24, 2026 · View company records in RevenueBase
10	PKF Littlejohn	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	702 contacts →
	Exact match “We are a fast-growing firm of accountants and business advisers based in London’s Canary Wharf, Leeds and in Manchester.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
11	Alten LTD - UK	Exact match	London, United KingdomHQ recorded Sep 24, 2026	10001+	529 contacts →
	Exact match “We are a leading Engineering and IT consultancy operating across all sectors in 30 different countries.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
12	Strategy Insights	Exact match	London, United KingdomHQ recorded Sep 24, 2026	51-200	528 contacts →
	Exact match “Strategy Insights is a specialist business and economic development consultancy.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
13	STEER	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	524 contacts →
	Exact match “Complex challenges.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
14	Broadstone	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	497 contacts →
	Exact match “Broadstone is a leading, independent UK consultancy delivering expert advice to employers, insurers, pension scheme trustees and lenders.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
15	Frontier Economics	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	477 contacts →
	Exact match “We help companies with their biggest challenges – market strategies, regulatory reviews, competition inquiries.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
16	Analysys Mason	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	459 contacts →
	Exact match “Analysys Mason is the leading specialist consultancy, creating lasting value in technology-intensive industries, including telecoms, digital infrastructure, software, IT services…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
17	GRS	Exact match	London, United KingdomHQ recorded Sep 24, 2026	51-200	425 contacts →
	Exact match “The GRS Group is an international executive search consultancy whose services include retained search, contingency search, advertised selection and interim solutions.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
18	Clearwater	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	384 contacts →
	Exact match “Clearwater is an independent corporate finance house focused on unlocking the latent potential in every business.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
19	Softwire	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	360 contacts →
	Exact match “Softwire exists to help organisations use technology to deliver meaningful outcomes and a positive impact for themselves, their users and the world.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
20	CPC Project Services	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	342 contacts →
	Exact match “CPC is an award-winning project management, cost management and building surveying consultancy.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
21	PSD Group	Exact match	London, United KingdomHQ recorded Sep 24, 2026	51-200	335 contacts →
	Exact match “PSD is a leading international executive recruitment consultancy, specialising in executive, management and board level recruitment with over 35 years of experience.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
22	Ubique Systems	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	333 contacts →
	Exact match “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
23	Cumming Group UK & Europe	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	324 contacts →
	Exact match “At Cumming Group, we are passionate about helping our clients execute large-scale, complex projects on-time and within budget.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
24	Cartesian	Exact match	London, United KingdomHQ recorded Sep 24, 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 · Sep 24, 2026 · View company records in RevenueBase
25	Quantuma	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	277 contacts →
	Exact match “Quantuma is a leading business advisory firm which works with businesses at the key milestones.” Recorded in the RevenueBase company graph · Sep 24, 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 “consultancy 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 7,716 consultancy firms based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 34,860 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Consultancy firms based in London, United Kingdom at a glance

As of Sep 24, 2026

41.0%Verified-email coverage

11.0Average contacts per company

1-10Median size (employees)

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

5,796

11-50

1,451

51-200

331

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 7,716 companies.

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 London, United Kingdom whose business descriptions match “consultancy 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 34,860 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 September 24, 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.

Consultancy firms by metro in the United Kingdom

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 “consultancy firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many consultancy firms are there based in London, United Kingdom?

RevenueBase identified 7,716 company matches for consultancy firms associated with London, United Kingdom as of September 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?

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

Which city in the United Kingdom has the most consultancy firms?

London leads the United Kingdom with 7,716 company records, followed by Manchester (528) and Birmingham (274).

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 34,860 professional contacts with verified work emails tracked across these 7,716 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 September 24, 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.