Company lists · Data refreshed September 2026

Top 25 Data center security contractors based in the United Kingdom

Name: Data center security contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 925 companies tracked

RevenueBase identified 925 data center security contractors headquartered in the United Kingdom as of September 2026 and tracks 10,505 professional contacts across them, including 3,774 with verified work emails. London is the largest hub.

This list covers data center security contractors 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 28, 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 28, 2026 86% judged on-target in blind review

925Companies

10,505Contacts tracked

3,774Verified emails

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The 25 largest data center security contractors based in the United Kingdom

Ranked by team size

Top 25 of 925 data center security contractors based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to data center security contractors: 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	CIS Security Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	919 contacts →
	Partial evidence “CIS Security is an independent security company equipped to help customers to solve the complex challenges in today’s digital, connected and regulated business world.” Source: RevenueBase Database · checked Sep 28, 2026
2	MTI	Strong evidence	Staines-upon-thames, United KingdomHQ checked Sep 28, 2026	201-500	764 contacts →
	Strong evidence “MTI provides award-winning, end-to-end technology solutions and services in cyber security and data centre for over 35 years.” Source: RevenueBase Database · checked Sep 28, 2026
3	Securityhq	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	502 contacts →
	Partial evidence “SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Source: RevenueBase Database · checked Sep 28, 2026
4	Kings Secure Technologies	Indirect evidence	Bradford, United KingdomHQ checked Sep 28, 2026	501-1,000	326 contacts →
	Indirect evidence “Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.” Source: RevenueBase Database · checked Sep 28, 2026
5	Bridewell	Partial evidence	Reading, United KingdomHQ checked Sep 28, 2026	201-500	303 contacts →
	Partial evidence “Bridewell is the trusted cyber security partner for organisations operating within Critical National Infrastructure (CNI), as well as companies who want the highest standard of…” Source: RevenueBase Database · checked Sep 28, 2026
6	Openview Security Solutions Limited	Partial evidence	Romford, United KingdomHQ checked Sep 28, 2026	201-500	200 contacts →
	Partial evidence “OpenView Security Solutions is the UK’S largest privately owned independent security company and provides unique, innovative and technologically excellent solutions to meet…” Source: RevenueBase Database · checked Sep 28, 2026
7	Datalec Precision Installations Limited	Strong evidence	Buntingford Herts, United KingdomHQ checked Sep 28, 2026	51-200	178 contacts →
	Strong evidence “OFFICIAL ACCOUNT* Datalec Precision Installations provides world-class data centre design, build, and installation services that leverage unique technical expertise, including…” Source: RevenueBase Database · checked Sep 28, 2026
8	Cyberfort	Strong evidence	Thatcham, United KingdomHQ checked Sep 28, 2026	51-200	159 contacts →
	Strong evidence “At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Source: RevenueBase Database · checked Sep 28, 2026
9	Norbain SD	Partial evidence	Bracknell, United KingdomHQ checked Sep 28, 2026	51-200	157 contacts →
	Partial evidence “Norbain is a leading UK security distributor, covering video surveillance, access control & intruder detection solutions.” Source: RevenueBase Database · checked Sep 28, 2026
10	Khipu Networks	Partial evidence	Fleet, United KingdomHQ checked Sep 28, 2026	51-200	125 contacts →
	Partial evidence “KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Source: RevenueBase Database · checked Sep 28, 2026
11	Bulletproof Cyber Security	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	123 contacts →
	Indirect evidence “Bulletproof is now part of WorkNest Secure.” Source: RevenueBase Database · checked Sep 28, 2026
12	Total Security Protection LTD	Partial evidence	Watford, United KingdomHQ checked Sep 28, 2026	51-200	116 contacts →
	Partial evidence “TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.” Source: RevenueBase Database · checked Sep 28, 2026
13	Conosco	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	105 contacts →
	Indirect evidence “Cybersecurity specialists providing technology and telecoms solutions that gives you the leadership, experience and resilience you need to build and secure the future of work.” Source: RevenueBase Database · checked Sep 28, 2026
14	Caretower An Integrity360 Company	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	97 contacts →
	Partial evidence “As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Source: RevenueBase Database · checked Sep 28, 2026
15	Croma Security Solutions Group PLC Cssg	Partial evidence	Whiteley, United KingdomHQ checked Sep 28, 2026	501-1,000	87 contacts →
	Partial evidence “Croma Security Solutions Group (CSSG) began in 1970 as a family-run business in Shirley, Southampton, known as County Locksmiths.” Source: RevenueBase Database · checked Sep 28, 2026
16	Wavenet Cyberguard	Partial evidence	Stourport-on-severn, United KingdomHQ checked Sep 28, 2026	201-500	86 contacts →
	Partial evidence “CyberGuard Technologies is the security division of Wavenet.” Source: RevenueBase Database · checked Sep 28, 2026
17	CLD Physical Security Systems	Partial evidence	Sandbach, United KingdomHQ checked Sep 28, 2026	51-200	64 contacts →
	Partial evidence “We are a globally recognised leader in design-led physical security solutions.” Source: RevenueBase Database · checked Sep 28, 2026
18	Layers Logic IT Limited	Indirect evidence	Manchester, United KingdomHQ checked Sep 28, 2026	501-1,000	63 contacts →
	Indirect evidence “Empowering Global Business with Seamless IT Excellence At Layers Logic IT Limited, we don’t just provide tech support-we build the digital backbone for global enterprises.” Source: RevenueBase Database · checked Sep 28, 2026
19	Alertsystems LTD	Partial evidence	Trowbridge, United KingdomHQ checked Sep 28, 2026	51-200	61 contacts →
	Partial evidence “AlertSystems specialise in the design, installation, service, and maintenance of commercial electronic security and fire safety systems.” Source: RevenueBase Database · checked Sep 28, 2026
20	Cyberlab	Partial evidence	Alderley Edge, United KingdomHQ checked Sep 28, 2026	51-200	57 contacts →
	Partial evidence “CyberLab is the UK-leading cyber security consultancy and managed services provider, trusted by over 1,200 enterprise businesses, government departments, and household names to…” Source: RevenueBase Database · checked Sep 28, 2026
21	Sword Ping Network Solutions	Indirect evidence	Bellshill, United KingdomHQ checked Sep 28, 2026	51-200	55 contacts →
	Indirect evidence “Based in Scotland, we are a leading systems integrator & managed service provider with offices in Bellshill and Aberdeen.” Source: RevenueBase Database · checked Sep 28, 2026
22	ACE Fire And Security	Partial evidence	Bedford, United KingdomHQ checked Sep 28, 2026	51-200	52 contacts →
	Partial evidence “Established in 1990, Ace Fire & Security is an end-to-end security, occupant safety, systems integration, monitoring and fire solutions specialist for commercial, industrial site…” Source: RevenueBase Database · checked Sep 28, 2026
23	Custom Intelligent Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	51 contacts →
	Partial evidence “Established in Custom Intelligent Security is a technology driven ISO27001 & NSi Gold Accredited independent electronic security specialist with a proven track record of…” Source: RevenueBase Database · checked Sep 28, 2026
24	Amthal Group Companies	Partial evidence	St Albans, United KingdomHQ checked Sep 28, 2026	51-200	50 contacts →
	Partial evidence “We are Amthal Group Companies, one of the nation’s trusted commercial life safety and security technology partners for UK businesses.” Source: RevenueBase Database · checked Sep 28, 2026
25	Electranet UK Limited	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	49 contacts →
	Indirect evidence “Electranet’s mission is to be a preferred partner to the public and private sectors, bringing competitively priced, secure and innovative solutions to the market.” Source: RevenueBase Database · checked Sep 28, 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: data center security contractors. 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 center security contractors.
Partial evidence: Its own public description names part of data center security contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name data center security contractors. 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 925 data center security contractors based in the United Kingdom

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Data center security contractors based in the United Kingdom at a glance

As of Sep 28, 2026

35.9%Verified-email coverage

11.4Average contacts per company

1-10Median size (employees)

19.7%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

508

11-50

289

51-200

201-500

501-1,000

1,001-5,000

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 925 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 center security contractors, 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 “data center security contractors”. 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 center security contractors), 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 center security contractors, 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, 3,774 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 28, 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 center security contractors by metro

Data center security contractors in London182

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 center security contractors, 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 center security contractors are there based in the United Kingdom?

RevenueBase identified 925 data center security contractors 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?

CIS Security Limited, headquartered in London, tops this list with the largest team on record.

Which city has the most data center security contractors?

London leads with 182 headquartered companies, followed by Manchester (21) and Birmingham (15).

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 3,774 verified decision-maker contacts tracked across these 925 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 28, 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.