Company lists · Data refreshed September 2026
Top 25 Consultancy firms based in London, United Kingdom
RevenueBase identified 7,716 consultancy firms headquartered in London, United Kingdom as of September 2026 and tracks 85,017 professional contacts across them, including 34,860 with verified work emails. London is the largest hub.
This list covers consultancy 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 24, 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.
The 25 largest consultancy firms based in London, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 8,458 contacts → | ||||
Indirect evidence “Mace Consult launched as a new and independent business on 5 March 2026, through a carve-out from Mace Group.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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 24, 2026Thanks. The Data Team will review it. | |||||
| 3 | 2,179 contacts → | ||||
Indirect evidence “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,979 contacts → | ||||
Indirect evidence “Antal International is a global executive search organisation with over 130 offices in more than 30 countries.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,331 contacts → | ||||
Strong evidence “We are a leading UK professional services consultancy at the forefront of risk, pensions, investment and insurance.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 6 | 1,304 contacts → | ||||
Indirect evidence “Efficio is a global leader in procurement and supply chain management and transformation.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,221 contacts → | ||||
Indirect evidence “Blackmont Consulting provides 100% free advisory services to NGO´s, NPO´s and start-ups.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,151 contacts → | ||||
Indirect evidence “At Moore Kingston Smith, we believe in the potential of people to make a positive impact, fuelled by the power of genuine understanding.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,011 contacts → | ||||
Strong 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 24, 2026Thanks. The Data Team will review it. | |||||
| 10 | 702 contacts → | ||||
Indirect evidence “We are a fast-growing firm of accountants and business advisers based in London’s Canary Wharf, Leeds and in Manchester.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 11 | 529 contacts → | ||||
Strong evidence “We are a leading Engineering and IT consultancy operating across all sectors in 30 different countries.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 12 | 528 contacts → | ||||
Strong evidence “Strategy Insights is a specialist business and economic development consultancy.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 13 | 524 contacts → | ||||
Indirect evidence “Complex challenges.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 14 | 497 contacts → | ||||
Strong evidence “Broadstone is a leading, independent UK consultancy delivering expert advice to employers, insurers, pension scheme trustees and lenders.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 15 | 477 contacts → | ||||
Indirect evidence “We help companies with their biggest challenges – market strategies, regulatory reviews, competition inquiries.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 16 | 459 contacts → | ||||
Strong 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 24, 2026Thanks. The Data Team will review it. | |||||
| 17 | 425 contacts → | ||||
Strong evidence “The GRS Group is an international executive search consultancy whose services include retained search, contingency search, advertised selection and interim solutions.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 18 | 384 contacts → | ||||
Indirect evidence “Clearwater is an independent corporate finance house focused on unlocking the latent potential in every business.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 19 | 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 24, 2026Thanks. The Data Team will review it. | |||||
| 20 | 342 contacts → | ||||
Strong evidence “CPC is an award-winning project management, cost management and building surveying consultancy.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 21 | 335 contacts → | ||||
Strong evidence “PSD is a leading international executive recruitment consultancy, specialising in executive, management and board level recruitment with over 35 years of experience.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 22 | 333 contacts → | ||||
Indirect 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 24, 2026Thanks. The Data Team will review it. | |||||
| 23 | 324 contacts → | ||||
Indirect evidence “At Cumming Group, we are passionate about helping our clients execute large-scale, complex projects on-time and within budget.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 24 | 302 contacts → | ||||
Indirect 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 24, 2026Thanks. The Data Team will review it. | |||||
| 25 | 277 contacts → | ||||
Indirect evidence “Quantuma is a leading business advisory firm which works with businesses at the key milestones.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
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: consultancy 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 consultancy firms.
- Partial evidence
- Its own public description names part of consultancy firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name consultancy 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 7,716 consultancy firms based in London, United Kingdom
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Consultancy firms based in London, United Kingdom at a glance
As of Sep 24, 2026Companies by employee count
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
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among consultancy 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 “consultancy 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 consultancy 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 consultancy 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, 34,860 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 24, 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.
Consultancy firms by metro in the United Kingdom
- Consultancy firms in London7716
- Consultancy firms in Manchester528
- Consultancy firms in Birmingham274
- Consultancy firms in Bristol262
- Consultancy firms in Edinburgh250
- Consultancy firms in Leeds249
- Consultancy firms in Glasgow228
- Consultancy firms in Cambridge164
- Consultancy firms in Liverpool129
- Consultancy firms in Nottingham129
- Consultancy firms in Sheffield127
- Consultancy firms in Reading124
- Consultancy firms in Oxford122
- Consultancy firms in Belfast102
- Consultancy firms in Cardiff101
- Consultancy firms in Derby96
- Consultancy firms in Brighton93
- Consultancy firms in Southampton87
- Consultancy firms in Milton Keynes84
- Consultancy firms in Newcastle Upon Tyne82
- Consultancy firms in York82
- Consultancy firms in Leicester77
- Consultancy firms in Northampton76
- Consultancy firms in Coventry74
- Consultancy firms in Norwich71
- Consultancy firms in Bath70
- Consultancy firms in Guildford68
- Consultancy firms in Aberdeen67
- Consultancy firms in Cheltenham65
- Consultancy firms in Exeter61
- Consultancy firms in Harrogate58
- Consultancy firms in Peterborough57
- Consultancy firms in Winchester57
- Consultancy firms in Chester54
- Consultancy firms in Bournemouth53
- Consultancy firms in Swindon53
- Consultancy firms in Chelmsford48
- Consultancy firms in Preston47
- Consultancy firms in St Albans47
- Consultancy firms in Warrington46
- Consultancy firms in Solihull45
- Consultancy firms in Huddersfield44
- Consultancy firms in Poole41
- Consultancy firms in Basingstoke40
- Consultancy firms in London London40
- Consultancy firms in Maidenhead40
- Consultancy firms in Watford40
- Consultancy firms in Bedford39
- Consultancy firms in Ipswich37
- Consultancy firms in Tunbridge Wells37
- Consultancy firms in Lincoln36
- Consultancy firms in Uk35
- Consultancy firms in Colchester34
- Consultancy firms in Hove34
- Consultancy firms in Portsmouth34
- Consultancy firms in Gloucester33
- Consultancy firms in Newbury33
- Consultancy firms in Worcester33
- Consultancy firms in Chichester32
- Consultancy firms in Horsham32
- Consultancy firms in Windsor31
- Consultancy firms in Plymouth30
- Consultancy firms in Farnham29
- Consultancy firms in Stockport29
- Consultancy firms in Croydon28
- Consultancy firms in Durham28
- Consultancy firms in Harrow28
- Consultancy firms in Hull28
- Consultancy firms in Maidstone28
- Consultancy firms in Shrewsbury28
- Consultancy firms in Altrincham27
- Consultancy firms in Camberley27
- Consultancy firms in Doncaster27
- Consultancy firms in Hemel Hempstead27
- Consultancy firms in Taunton27
- Consultancy firms in Banbury26
- Consultancy firms in Canterbury26
- Consultancy firms in Leamington Spa26
- Consultancy firms in Lichfield26
- Consultancy firms in Wokingham26
- Consultancy firms in Wolverhampton26
- Consultancy firms in High Wycombe25
- Consultancy firms in Ilford25
- Consultancy firms in Wakefield25
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 consultancy 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 consultancy firms are there based in London, United Kingdom?
RevenueBase identified 7,716 consultancy 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?
MACE, headquartered in London, tops this list with the largest team on record.
Which city has the most consultancy firms?
London leads with 7716 headquartered companies, 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 the top results, verified emails and direct dials included. Upgrading unlocks all 34,860 verified decision-maker contacts tracked across these 7,716 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 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 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.