Company lists · Data refreshed September 2026

Top 25 Data center security companies based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 10, 2026 85 companies tracked

RevenueBase identified 85 data center security companies headquartered in London, United Kingdom as of September 2026 and tracks 1,658 professional contacts across them, including 402 with verified work emails and 65 with mobile numbers. London is the largest hub.

This list covers data center security 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 10, 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 10, 2026 86% judged on-target in blind review

85Companies

1,658Contacts tracked

402Verified emails

65Mobile numbers

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The 25 largest data center security companies based in London, United Kingdom

Ranked by team size

Top 25 of 85 data center security companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 10, 2026. RevenueBase Smart Search rates how each company's information relates to data center security 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	CIS Security Limited	Partial evidence	London, United KingdomHQ checked Sep 10, 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 10, 2026
2	Bulletproof Cyber Security	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	123 contacts →
	Indirect evidence “Bulletproof is now part of WorkNest Secure.” Source: RevenueBase Database · checked Sep 10, 2026
3	City Security Services Part Of City Group Security	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	201-500	64 contacts →
	Partial evidence “City Security Services (CSS) have more than 25 years’ experience within the corporate security, public sector, education and social housing markets delivering manned guarding…” Source: RevenueBase Database · checked Sep 10, 2026
4	Black Diamond Security	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	201-500	58 contacts →
	Partial evidence “Black Diamond Security - Safeguarding Your World.” Source: RevenueBase Database · checked Sep 10, 2026
5	Ak9 Security And FM Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	501-1,000	43 contacts →
	Partial evidence “AK9 Security and FM Solutions offers comprehensive security solutions for businesses, governmental organizations, and residential areas.” Source: RevenueBase Database · checked Sep 10, 2026
6	DCD Academy	Strong evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	30 contacts →
	Strong evidence “DCD Academy is the data center industry’s premier workforce development partner.” Source: RevenueBase Database · checked Sep 10, 2026
7	Dnssense	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	29 contacts →
	Partial evidence “DNSSense, positioned under Noventiq during 2024–2025, completed a 100% local-ownership restructuring in 2025 and evolved into a Turkey-based, R&D-driven DNS security company.” Source: RevenueBase Database · checked Sep 10, 2026
8	Welcome Gate	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	23 contacts →
	Partial evidence “Who are you… Most likely you are a Workplace or IT Professional with a lot on your plate including physical electronic security systems, such as - Access control - CCTV - Intruder…” Source: RevenueBase Database · checked Sep 10, 2026
9	Line Security Services LTD	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	17 contacts →
	Partial evidence “As a security services provider, protecting people and assets is our top priority.” Source: RevenueBase Database · checked Sep 10, 2026
10	Integrated Visual Protection Limited	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	16 contacts →
	Partial evidence “Integrated Visual Protection Limited (IVP) is a privately owned Company, which has been established since 2002, providing all types of Fire and Security Services to a variety of…” Source: RevenueBase Database · checked Sep 10, 2026
11	The Security Group	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	11 contacts →
	Partial evidence “The Security Group delivers state-of-the-art security solutions to protect businesses, assets, and people.” Source: RevenueBase Database · checked Sep 10, 2026
12	Disclosure Cybersecurity	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	11 contacts →
	Partial evidence “Disclosure Cybersecurity Ltd is a specialist cyber security company, formed by professionals with extensive experience and wide exposure in the cyber security market.” Source: RevenueBase Database · checked Sep 10, 2026
13	Defenx	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	10 contacts →
	Partial evidence “Defenx is an IT company that has an extensive background in providing businesses with cloud based security solutions and support for their digital infrastructure.” Source: RevenueBase Database · checked Sep 10, 2026
14	Threat Protect	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	1-10	7 contacts →
	Indirect evidence “Threat Protect is a vendor-agnostic cybersecurity, compliance and AI governance partner based in London, working with organisations across finance, legal, energy, pharma…” Source: RevenueBase Database · checked Sep 10, 2026
15	Valkyrie GB Limited	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	6 contacts →
	Partial evidence “At Valkyrie, our mission is rooted in a commitment to safeguarding our clients with the highest standards of security and discretion.” Source: RevenueBase Database · checked Sep 10, 2026
16	White Coast Security	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	5 contacts →
	Partial evidence “We Empower Organizations Worldwide with Cutting-Edge Security Solutions.” Source: RevenueBase Database · checked Sep 10, 2026
17	Bell ICT	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	1-10	5 contacts →
	Indirect evidence “From the little niggles to the large networks It’s the little things that are vital whether you have a website, online accounts or any type of web-based infrastructure.” Source: RevenueBase Database · checked Sep 10, 2026
18	Rexel Cybersecurity	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	5 contacts →
	Partial evidence “At Rexel Cyber we help businesses fight the constant threat of cyber attack and data breach.” Source: RevenueBase Database · checked Sep 10, 2026
19	The Teknov8 Group	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	3 contacts →
	Indirect evidence “Teknov8 is an award winning UK Headquartered cloud technology innovator.” Source: RevenueBase Database · checked Sep 10, 2026
20	Stryke	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	1-10	3 contacts →
	Partial evidence “With a dramatic shift in the way we now work and an increasingly sophisticated cyber landscape, digital security and resiliency has never been more important – protect critical…” Source: RevenueBase Database · checked Sep 10, 2026
21	Threatproof	Indirect evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	2 contacts →
	Indirect evidence “At Threatproof, our mission is to redefine cybersecurity for businesses of all sizes.” Source: RevenueBase Database · checked Sep 10, 2026
22	Clearfin Security	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	1-10	2 contacts →
	Partial evidence “Clearfin is dedicated to providing highly effective yet affordable information security services, enabling businesses of all kinds to gain a foothold in the evolving cyber…” Source: RevenueBase Database · checked Sep 10, 2026
23	Cansol Consulting	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	11-50	2 contacts →
	Partial evidence “Founded in 2017, Cansol is a Cyber Security company with office in London and Dubai.” Source: RevenueBase Database · checked Sep 10, 2026
24	Checksec	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	1-10	2 contacts →
	Partial evidence “CheckSec is a UK based provider of security services and technologies, with a global focus.” Source: RevenueBase Database · checked Sep 10, 2026
25	Emblem Security	Partial evidence	London, United KingdomHQ checked Sep 10, 2026	51-200	1 contacts →
	Partial evidence “Emblem Security offers comprehensive protection, from physical security to advanced IT solutions.” Source: RevenueBase Database · checked Sep 10, 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 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 center security companies.
Partial evidence: Its own public description names part of data center security companies, 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 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 85 data center security companies based in London, United Kingdom

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Data center security companies based in London, United Kingdom at a glance

As of Sep 10, 2026

24.2%Verified-email coverage

3.9%Mobile-number coverage

19.5Average contacts per company

11-50Median size (employees)

96.5%Largest-city concentration · London

Sep 10, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 12.0d

3660–30

3531–60

061–90

090–180

1180+

Company record updated

Median 76.0d

00–30

45631–60

90161–90

21590–180

86180+

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 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 center 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 data center 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 data center security 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, 402 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 10, 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 companies by metro in the United Kingdom

Data center security companies in London82

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 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 center security companies are there based in London, United Kingdom?

RevenueBase identified 85 data center security 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?

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

Which city has the most data center security companies?

London leads with 82 headquartered companies, followed by Manchester (10) and Birmingham (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 402 verified decision-maker contacts tracked across these 85 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 10, 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.