Company lists · Data refreshed September 2026

Top 25 IT technology companies based in the United Kingdom

Name: IT technology companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 695 companies tracked

RevenueBase identified 695 IT technology companies headquartered in the United Kingdom as of September 2026 and tracks 3,702 professional contacts across them, including 370 with verified work emails. London is the largest hub.

This list covers IT technology companies headquartered in the 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

695Companies

3,702Contacts tracked

370Verified emails

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The 25 largest IT technology companies based in the United Kingdom

Ranked by team size

Top 25 of 695 IT technology companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to IT technology companies: 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	Cassava Technologies	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	85 contacts →
	Partial evidence “Cassava Technologies is a global technology leader of African heritage providing a vertically integrated ecosystem of digital services and infrastructure enabling digital…” Source: RevenueBase Database · checked Sep 21, 2026
2	Skylinx Technologies	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	63 contacts →
	Strong evidence “A unification of highly-skilled and experienced IT professionals, who are veterans of creative manipulation of technology.” Source: RevenueBase Database · checked Sep 21, 2026
3	KJL Group Technology Management	Partial evidence	Basildon, United KingdomHQ checked Sep 21, 2026	11-50	35 contacts →
	Partial evidence “The KJL Group offer complete technology management services for business.” Source: RevenueBase Database · checked Sep 21, 2026
4	Minerva	Partial evidence	Potters Bar, United KingdomHQ checked Sep 21, 2026	11-50	26 contacts →
	Partial evidence “Who we are: An expert, professional and friendly IT company.” Source: RevenueBase Database · checked Sep 21, 2026
5	Outsource International LTD	Partial evidence	Newbury, United KingdomHQ checked Sep 21, 2026	11-50	26 contacts →
	Partial evidence “We manage all aspects of global information technology services covering multi-vendor technologies from Desktop and Network Services through to Smart Technologies and Resourcing.” Source: RevenueBase Database · checked Sep 21, 2026
6	Onyx IT	Partial evidence	Norwich, United KingdomHQ checked Sep 21, 2026	11-50	18 contacts →
	Partial evidence “In this era of Digital Transformation and mobile working our goal is to help your business to run more efficiently with scalable technology at the right price.” Source: RevenueBase Database · checked Sep 21, 2026
7	Tinder Corporation LTD	Strong evidence	Chatham, United KingdomHQ checked Sep 21, 2026	11-50	18 contacts →
	Strong evidence “Tinder Corporation Ltd (or TC) is an IT and technology company based in Kent, UK.” Source: RevenueBase Database · checked Sep 21, 2026
8	Coretech, A WPP Company	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	18 contacts →
	Partial evidence “Coretech delivers and manages the technology that enables WPP companies to collaborate more effectively with their clients and each other.” Source: RevenueBase Database · checked Sep 21, 2026
9	Ezbz Solutions	Partial evidence	Berkshire, United KingdomHQ checked Sep 21, 2026	1-10	14 contacts →
	Partial evidence “Vision: To be a leading innovator in technology solutions, revolutionizing how businesses and individuals interact with the digital world, and making cutting-edge technology…” Source: RevenueBase Database · checked Sep 21, 2026
10	Global Experience Specialists GES LTD	Partial evidence	Birmingham, United KingdomHQ checked Sep 21, 2026	11-50	13 contacts →
	Partial evidence “GLOBAL EXPERIENCE SPECIALISTS (GES) LTD is an Information Technology and Services company located in Unit 1, National Exhibition Centre, Birmingham, West Midlands, United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026
11	Mountfields Lodge School	Indirect evidence	Loughborough, United KingdomHQ checked Sep 21, 2026	51-200	12 contacts →
	Indirect evidence “Mountfields Lodge School is a computer software company based out of Epinal Way, Loughborough, Leicestershire, United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026
12	Farthest Gate Limited	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	12 contacts →
	Indirect evidence “FARTHEST GATE LIMITED is an internet company based out of Euston St, London, United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026
13	Rapidsource IT Limited	Partial evidence	Harlow, United KingdomHQ checked Sep 21, 2026	11-50	11 contacts →
	Partial evidence “Rapidsource - excellence in IT solutions.” Source: RevenueBase Database · checked Sep 21, 2026
14	Tristar Tech Solutions	Partial evidence	Welwyn Garden City, United KingdomHQ checked Sep 21, 2026	11-50	11 contacts →
	Partial evidence “Tristar Tech Solutions established in encompasses 3 divisions, Tristar Web Solutions, Tristar Support and Tristar Hosting, offering a one stop solution for all your IT…” Source: RevenueBase Database · checked Sep 21, 2026
15	Everon	Partial evidence	Leeds, United KingdomHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “SEAMLESS IT SERVICES, MAKING YOUR BUSINESS THRIVE With over 20 years’ experience, we understand that your IT systems need to fully support the aims and goals of your business.” Source: RevenueBase Database · checked Sep 21, 2026
16	Vaughan Data Systems LTD	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “VAUGHAN DATA SYSTEMS LTD is an information technology and services company.” Source: RevenueBase Database · checked Sep 21, 2026
17	ACS IT Services	Strong evidence	Shipley, United KingdomHQ checked Sep 21, 2026	51-200	9 contacts →
	Strong evidence “At ACS IT Services, our mission is to provide technology-reliant businesses with the right tools, services, and support to thrive.” Source: RevenueBase Database · checked Sep 21, 2026
18	Paperround HND Service Limited	Partial evidence	Welwyn Garden City, United KingdomHQ checked Sep 21, 2026	1-10	9 contacts →
	Partial evidence “Paperround HND Service Ltd is an Information Technology and Services company” Source: RevenueBase Database · checked Sep 21, 2026
19	Eclarity Solutions LTD	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 21, 2026	11-50	9 contacts →
	Partial evidence “Eclarity Solutions Ltd are an experienced supplier of IT Services for small to medium businesses, working nationally as well as local clients in Worcestershire, Warwickshire and…” Source: RevenueBase Database · checked Sep 21, 2026
20	Computer Assistance UK	Indirect evidence	Oxford, United KingdomHQ checked Sep 21, 2026	11-50	8 contacts →
	Indirect evidence “At Computer Assistance and Wiseserve, we're your go-to tech experts with a touch of magic!” Source: RevenueBase Database · checked Sep 21, 2026
21	Sense IT Support	Strong evidence	Ringwood, United KingdomHQ checked Sep 21, 2026	1-10	8 contacts →
	Strong evidence “SENSE IT SUPPORT LIMITED is an Information Technology and Services company located in 6 West St, Ringwood, United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026
22	Orbital Internet Group LTD	Partial evidence	Canterbury, United KingdomHQ checked Sep 21, 2026	51-200	8 contacts →
	Partial evidence “ORBITAL INTERNET GROUP LIMITED is an information technology and services company based out of COUNTY HOUSE STATION APPROACH BEKESBOURNE, CANTERBURY, United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026
23	Jansa IT	Strong evidence	Harrow, United KingdomHQ checked Sep 21, 2026	1-10	8 contacts →
	Strong evidence “Jansa IT are a vibrant and successful company offering a range of Internet and technology services such as website design and hosting, network implementation, support and…” Source: RevenueBase Database · checked Sep 21, 2026
24	Hhes Limited	Partial evidence	Abingdon, United KingdomHQ checked Sep 21, 2026	1-10	8 contacts →
	Partial evidence “HHES LIMITED is an information technology and services company.” Source: RevenueBase Database · checked Sep 21, 2026
25	We DO Your Group Limited	Partial evidence	Bristol, United KingdomHQ checked Sep 21, 2026	11-50	7 contacts →
	Partial evidence “We Do Your Group is a group of technology companies with the aim of providing outstanding customer service while giving you fantastic value for money.” Source: RevenueBase Database · checked Sep 21, 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: IT technology 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 IT technology companies.
Partial evidence: Its own public description names part of IT technology companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT technology 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 695 IT technology companies based in the United Kingdom

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IT technology companies based in the United Kingdom at a glance

As of Sep 21, 2026

10.0%Verified-email coverage

5.3Average contacts per company

1-10Median size (employees)

23.2%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

543

11-50

111

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 695 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 IT technology 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 the United Kingdom whose own description of what they do matches “IT technology 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 IT technology 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 IT technology companies, and records with no verified work email. Companies headquartered outside United Kingdom 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, 370 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.

IT technology companies by metro

IT technology companies in London161

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 IT technology 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 IT technology companies are there based in the United Kingdom?

RevenueBase identified 695 IT technology companies headquartered in the 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?

Cassava Technologies, headquartered in London, tops this list with the largest team on record.

Which city has the most IT technology companies?

London leads with 161 headquartered companies, followed by Bristol (10) and Reading (9).

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 370 verified decision-maker contacts tracked across these 695 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.