Company lists · Data refreshed September 2026
Top 25 Data firm companies based in London, United Kingdom
RevenueBase identified 751 data firm companies headquartered in London, United Kingdom as of September 2026 and tracks 15,003 professional contacts across them, including 6,682 with verified work emails. London is the largest hub.
This list covers data firm companies 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 21, 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 data firm companies based in London, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,663 contacts → | ||||
Strong evidence “CACI offers an unrivalled range of data, marketing and IT solutions to a wide range of industries across both the public and private sectors.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,100 contacts → | ||||
Strong evidence “Smartstream unlocks trusted, intelligent data insights – clearly, consistently, and without compromise.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 702 contacts → | ||||
Indirect evidence “We provide high performing intelligence that answers critical business questions for leading companies around the world.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 697 contacts → | ||||
Indirect evidence “Follow us now at WPP Enterprise Solutions, WPP’s global business transformation unit, designing, building and operating the growth systems that competitive businesses rely on.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 601 contacts → | ||||
Strong evidence “JMAN is the commercial data partner that specializes in maximizing value creation activities for private equity funds and their portfolio companies.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 270 contacts → | ||||
Strong evidence “We are 4most: the go-to analytics consultancy for financial institutions who want to make better, data-driven decisions with confidence.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 230 contacts → | ||||
Strong evidence “Thorogood is an independent consultancy that provides end-to-end data, AI and analytics solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 219 contacts → | ||||
Strong evidence “As a global leader in service management, we help businesses transform their operations with data-driven insights, scalable digital solutions, and measurable results.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 197 contacts → | ||||
Indirect evidence “The Information Lab is on a mission.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 186 contacts → | ||||
Strong evidence “Elait exists to transform unwieldy data into a competitive advantage.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 150 contacts → | ||||
Strong evidence “Sagacity are the data intelligence people.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 150 contacts → | ||||
Strong evidence “Fornova empowers the global travel and hospitality industry to optimize distribution, generate demand and maximize revenue by delivering best-in-class, data-driven Business…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 141 contacts → | ||||
Strong evidence “TuTeck Technologies is a next-generation global technology company that empowers enterprises to transform their businesses through data-driven insights and digital innovation.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 140 contacts → | ||||
Indirect evidence “Business Science Corporation apply science and technology in order to ensure that our clients significantly increase their performance by giving them both the knowledge to perform…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 125 contacts → | ||||
Indirect evidence “RocSearch is an industry leader in customised business intelligence solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 119 contacts → | ||||
Indirect evidence “Elastacloud has been acquired by Acora.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 111 contacts → | ||||
Indirect evidence “Trusted by some of the UK's most important organisations, Amber Labs delivers digital transformation where assurance matters just as much as pace.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 99 contacts → | ||||
Strong evidence “Alpharithm Technologies is a multi award winning Consultancy, specializing in Data and AI.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 98 contacts → | ||||
Strong evidence “The authoritative source for global data intelligence Neudata provides actionable, unbiased market intelligence to buyers and sellers of market and alternative data.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 85 contacts → | ||||
Strong evidence “Make the most of your data with enterprise-ready software that helps you extract, enrich, and discover your company’s most valuable knowledge.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 82 contacts → | ||||
Indirect evidence “We transform business through strategic consulting.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 79 contacts → | ||||
Strong evidence “With 26+ years of experience and more than 500+ professionals, Cognition empowers growth for B2B organizations by delivering reliable data, intelligence, and actionable insights…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 70 contacts → | ||||
Strong evidence “Nowasys is a Data Engineering company based in the United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 69 contacts → | ||||
Indirect evidence “Altius is now an Avanade company.” Source: RevenueBase Database · checked Sep 21, 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: data firm companies. 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 data firm companies.
- Partial evidence
- Its own public description names part of data firm companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name data firm companies. 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 751 data firm companies based in London, United Kingdom
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Data firm companies based in London, United Kingdom at a glance
As of Sep 21, 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 751 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 data firm companies, 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 “data firm companies”. 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 data firm companies), 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 data firm companies, 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, 6,682 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 21, 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.
Data firm companies by metro in the United Kingdom
- Data firm companies in London751
- Data firm companies in Manchester57
- Data firm companies in Leeds33
- Data firm companies in Bristol26
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 data firm companies, 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 data firm companies are there based in London, United Kingdom?
RevenueBase identified 751 data firm companies 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?
Caci LTD, headquartered in London, tops this list with the largest team on record.
Which city has the most data firm companies?
London leads with 751 headquartered companies, followed by Manchester (57) and Leeds (33).
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 6,682 verified decision-maker contacts tracked across these 751 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 21, 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.
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