Company lists · Data refreshed September 2026
Top 25 IT infrastructure and security companies based in Leeds, United Kingdom
RevenueBase identified 44 IT infrastructure and security companies headquartered in Leeds, United Kingdom as of September 2026 and tracks 501 professional contacts across them, including 282 with verified work emails. Across the United Kingdom, London is the largest hub for this category (1,000 companies); Leeds has 44.
This list covers IT infrastructure and security companies headquartered in Leeds, 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 27, 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 IT infrastructure and security companies based in Leeds, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 260 contacts → | ||||
Partial evidence “We are a global boutique, specializing exclusively in the convergence of identity-driven security and networking.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 2 | 38 contacts → | ||||
Strong evidence “WhiteSpider is a UK-based IT services company with a global reach, specialising in enterprise infrastructure transformation.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 3 | 16 contacts → | ||||
Strong evidence “Altinet, a part of the Arrow Business Communications group, are a specialist IT security and storage value added reseller (VAR) for IT infrastructures.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 4 | 15 contacts → | ||||
Indirect evidence “At Sycom Integrated Solutions, we architect future-ready organisations through smart strategy, secure systems, and skilled leadership.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 5 | 14 contacts → | ||||
Partial evidence “Netprotocol is a leading managed service provider delivering secure, reliable and future-ready IT solutions.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 6 | 14 contacts → | ||||
Partial evidence “Fresh Mango UK is an IT Support and cybersecurity provider that has been successfully providing computer and IT support services in the United Kingdom for over 25 years.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 7 | 11 contacts → | ||||
Indirect evidence “InfraTech Systems empowers organisations to realise their greatest potential through intelligent technology and trusted partnerships.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 8 | 10 contacts → | ||||
Partial evidence “From cyber security, through to safeguarding and compliance, we provide digital security solutions perfectly designed to suit any requirement.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 9 | 8 contacts → | ||||
Strong evidence “Invest IT is focused on providing IT Infrastructure management services to our clients & partners, making sure maximum return on investment is achieved.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 10 | 7 contacts → | ||||
Indirect evidence “Netcare Europe provides high quality network solutions that create a positive long-term return on investment for our clients.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 11 | 6 contacts → | ||||
Partial evidence “Conformedia provides bespoke IT services with a personal touch.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 12 | 6 contacts → | ||||
Partial evidence “Experts in IT services and consultancy, our passion is technology.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 13 | 6 contacts → | ||||
Indirect evidence “As one of the leading providers of workforce solutions, our focus is a total commitment to the needs of modern businesses across the UK with a keen understanding of information…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 14 | 5 contacts → | ||||
Indirect evidence “Westcom Networks was founded in 2002 with the vision of providing simple and effective networking solutions for clients.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 15 | 5 contacts → | ||||
Partial evidence “We offer outstanding independent IT advice and services for organisations.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 16 | 4 contacts → | ||||
Partial evidence “At Cyber Security Partners (CSP) we specialise in the provision of Cyber Security Consultancy, Data Protection and Certification and Compliance services including Risk Assessment…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 17 | 4 contacts → | ||||
Partial evidence “We’re a managed IT solutions provider specializing in providing IT services to various small to medium sized enterprises.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 18 | 3 contacts → | ||||
Indirect evidence “Helping you do business securely” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 19 | 3 contacts → | ||||
Strong evidence “Welcome to Futurah - Your Trusted Managed Service Provider At Futurah, we're dedicated to transforming the way businesses manage their IT infrastructure.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 20 | 2 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 21 | 2 contacts → | ||||
Partial evidence “At SquareCubed we bring 40 years of corporate IT service experience to your business.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 22 | 2 contacts → | ||||
Partial evidence “At Greyhound IT we provide fast & reliable IT Support to let you concentrate on your business while we look after your IT, making technology work for you and not the other way…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 23 | 2 contacts → | ||||
Partial evidence “e2e Cloud IT, founded in 2011 in United Kingdom has been providing top consulting services to the global business to resolve the critical business problems and come up with…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 24 | 1 contacts → | ||||
Partial evidence “Helping clients maximise the value in their IT through a combination of advisory, delivery and support services.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 25 | 1 contacts → | ||||
Partial evidence “Guiding and supporting multiple clients, businesses and IT teams to achieve their goals.* Business analysis and problem identification * Solution design, research and development…” Source: RevenueBase Database · checked Sep 27, 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: IT infrastructure and security 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 infrastructure and security companies.
- Partial evidence
- Its own public description names part of IT infrastructure and security companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name IT infrastructure and security 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 44 IT infrastructure and security companies based in Leeds, United Kingdom
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IT infrastructure and security companies based in Leeds, United Kingdom at a glance
As of Sep 27, 2026Companies by employee count
Email recency for this list is measured across the whole United Kingdom list rather than for Leeds, so it is reported there. Company counts and contact totals on this page are exact for Leeds, over 44 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 infrastructure and security 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 Leeds, United Kingdom whose own description of what they do matches “IT infrastructure and security 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 infrastructure and security 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 infrastructure and security companies, and records with no verified work email. Companies headquartered outside Leeds 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, 282 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 27, 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 infrastructure and security companies by metro in the United Kingdom
- IT infrastructure and security companies in London1000
- IT infrastructure and security companies in Manchester87
- IT infrastructure and security companies in Birmingham56
- IT infrastructure and security companies in Bristol39
- IT infrastructure and security companies in Glasgow29
- IT infrastructure and security companies in Milton Keynes28
- IT infrastructure and security companies in Reading25
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 infrastructure and security 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 infrastructure and security companies are there based in Leeds, United Kingdom?
RevenueBase identified 44 IT infrastructure and security companies headquartered in Leeds, 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?
Xalient, headquartered in Leeds, tops this list with the largest team on record.
Which city in the United Kingdom has the most IT infrastructure and security companies?
London leads the United Kingdom with 1,000 headquartered companies, followed by Manchester (87) and Birmingham (56). Leeds has 44.
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 282 verified decision-maker contacts tracked across these 44 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 27, 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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