Company lists · Data refreshed September 2026
Top 25 B2B consultancies based in London, United Kingdom
RevenueBase identified 6,379 B2B consultancies headquartered in London, United Kingdom as of September 2026 and tracks 48,780 professional contacts across them, including 18,162 with verified work emails. London is the largest hub.
This list covers B2B consultancies 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.
The 25 largest B2B consultancies based in London, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 23, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,304 contacts → | ||||
Indirect evidence “Efficio is a global leader in procurement and supply chain management and transformation.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 709 contacts → | ||||
Indirect evidence “We are Digitas.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 5 | 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 23, 2026Thanks. The Data Team will review it. | |||||
| 6 | 453 contacts → | ||||
Partial evidence “B2B Marketing is a professional community where all B2B marketers can easily communicate with like-minded industry peers.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 7 | 434 contacts → | ||||
Indirect evidence “MBA: The Acceleration Agents, where digital and direct interconnect.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 8 | 422 contacts → | ||||
Indirect evidence “Hi, we're Gravity - the world’s most awarded brand-to-demand marketing agency!” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 9 | 418 contacts → | ||||
Indirect evidence “Proxima works with Chief Procurement Officers who expect procurement to deliver measurable performance, support growth, and lead with confidence.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 10 | 408 contacts → | ||||
Indirect evidence “Zenitech creates technology to transform businesses.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 11 | 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 23, 2026Thanks. The Data Team will review it. | |||||
| 12 | 312 contacts → | ||||
Partial evidence “RONIN International is an independent B2B market research company specialising in business, healthcare and tech studies.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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 23, 2026Thanks. The Data Team will review it. | |||||
| 14 | 289 contacts → | ||||
Partial evidence “We deliver full-service B2B marketing solutions for world-class customer experiences – with an eye always toward the future.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 15 | 277 contacts → | ||||
Partial evidence “Euromoney Institutional Investor PLC has now rebranded as Delinian Delinian is a global B2B information-services business.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 16 | 275 contacts → | ||||
Indirect 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, 2026Thanks. The Data Team will review it. | |||||
| 17 | 249 contacts → | ||||
Indirect evidence “We offer a comprehensive range of consulting services for trade lifecycle management to the energy, commodity, shipping, treasury, and financial markets, delivered by the most…” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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, 2026Thanks. The Data Team will review it. | |||||
| 19 | 214 contacts → | ||||
Indirect evidence “Retail Reply helps clients accelerate their response to the opportunities of digital transformation in the retail and consumer sector.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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, 2026Thanks. The Data Team will review it. | |||||
| 21 | 186 contacts → | ||||
Partial evidence “We work exclusively with B2B publishers and lead gen providers.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 22 | 184 contacts → | ||||
Partial evidence “Qogita is a leading global wholesale B2B platform that offers a wide variety of products, brands and categories across geographies.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 23 | 178 contacts → | ||||
Partial evidence “The world’s most experienced B2B market research company.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 24 | 178 contacts → | ||||
Indirect evidence “The future has never moved this fast.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 25 | 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, 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: B2B consultancies. 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 consultancies.
- Partial evidence
- Its own public description names part of B2B consultancies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name B2B consultancies. 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 6,379 B2B consultancies based in London, United Kingdom
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B2B consultancies based in London, United Kingdom at a glance
As of Sep 23, 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 6,379 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 consultancies, 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 consultancies”. 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 consultancies), 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 consultancies, 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, 18,162 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 consultancies by metro in the United Kingdom
- B2B consultancies in London6379
- B2B consultancies in Manchester450
- B2B consultancies in Birmingham225
- B2B consultancies in Bristol224
- B2B consultancies in Leeds218
- B2B consultancies in Glasgow189
- B2B consultancies in Edinburgh185
- B2B consultancies in Cambridge139
- B2B consultancies in Reading137
- B2B consultancies in Nottingham113
- B2B consultancies in Oxford113
- B2B consultancies in Sheffield108
- B2B consultancies in Liverpool107
- B2B consultancies in Milton Keynes87
- B2B consultancies in Brighton76
- B2B consultancies in Southampton74
- B2B consultancies in Norwich70
- B2B consultancies in Cheltenham69
- B2B consultancies in Newcastle Upon Tyne69
- B2B consultancies in Derby68
- B2B consultancies in Northampton68
- B2B consultancies in Leicester67
- B2B consultancies in Belfast66
- B2B consultancies in Cardiff65
- B2B consultancies in Guildford64
- B2B consultancies in York63
- B2B consultancies in Bath56
- B2B consultancies in Bournemouth54
- B2B consultancies in Coventry54
- B2B consultancies in Poole53
- B2B consultancies in Exeter52
- B2B consultancies in Aberdeen51
- B2B consultancies in Peterborough51
- B2B consultancies in Preston48
- B2B consultancies in St Albans48
- B2B consultancies in Winchester47
- B2B consultancies in Swindon46
- B2B consultancies in Chester45
- B2B consultancies in Basingstoke44
- B2B consultancies in Harrogate44
- B2B consultancies in Huddersfield40
- B2B consultancies in Warrington39
- B2B consultancies in Watford39
- B2B consultancies in Chelmsford38
- B2B consultancies in Portsmouth35
- B2B consultancies in Solihull35
- B2B consultancies in Chichester34
- B2B consultancies in Worcester34
- B2B consultancies in Horsham33
- B2B consultancies in Maidenhead33
- B2B consultancies in Uk33
- B2B consultancies in Ipswich32
- B2B consultancies in Newbury32
- B2B consultancies in Windsor32
- B2B consultancies in Slough31
- B2B consultancies in Bedford30
- B2B consultancies in London London30
- B2B consultancies in Plymouth29
- B2B consultancies in Wolverhampton29
- B2B consultancies in Leamington Spa28
- B2B consultancies in Lincoln28
- B2B consultancies in Durham27
- B2B consultancies in Farnham27
- B2B consultancies in Hove27
- B2B consultancies in Woking27
- B2B consultancies in Gloucester26
- B2B consultancies in Hemel Hempstead25
- B2B consultancies in Stockport25
- B2B consultancies in Wokingham25
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 consultancies, 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 consultancies are there based in London, United Kingdom?
RevenueBase identified 6,379 B2B consultancies 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?
Baringa, headquartered in London, tops this list with the largest team on record.
Which city has the most B2B consultancies?
London leads with 6379 headquartered companies, followed by Manchester (450) and Birmingham (225).
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 18,162 verified decision-maker contacts tracked across these 6,379 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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Download this list →Related lists
B2B consultancies by geography
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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.